Mass Transfer Equations Research Articles

USE OF MATHEMATICAL MODELS IN THE PROBLEMS OF ASSESSING THE CONSEQUENCES OF EXTREME SITUATIONS ON INDUSTRIAL FACILITIES

The report considers some classes of numerical models that were built to predict the consequences of emergencies at industrial enterprises. The first class of models has been developed to predict chemical air pollution in case of accidental emissions of toxic substances. Modeling is carried out on the basis of the fundamental equations of aerodynamics and mass transfer. Difference splitting schemes are used for the numerical solution of the modeling equations. The second class of numerical models has been developed to assess the risk of chemical injury to people in industrial rooms. The third class of models was developed to assess the risk of injury to people when a shock wave moves. To solve this problem Euler equations were used. The fourth class of models was developed to predict river pollution in case of accident chemical pollution. The fifth class of models was developed to assess the influence of protection barriers to reduce air pollution Computer codes were developed on the base of proposed numerical models.

APPLICATION OF SCREENING ALONG HIGHWAYS TO REDUCE THE GAS LOAD IN THE SURROUNDING AREA

This work is devoted to the development of a method for numerical calculation the concentration field of a harmful substance CO along the road and in the territory adjacent to it. The method takes into account not only the physical and meteorological parameters, but also the location and height of the screens. The implementation of the method is based on the mass transfer equation for the impurity concentration and the potential flow equation for the velocity vector components. The solution of equations is based on finite difference methods. Based on this method, a software package has been developed that allows you to conduct computational experiments and does not require large amounts of computer time. Based on the results obtained, an assessment was made of the effectiveness of the use of screens to reduce the level of air pollution near highways. It has been established that an increase in the height of the screens from 2.8 m to 5 m reduces the level of pollution behind the road by up to 50%.

Removal of indoor air ozone using carbon-based filters: Systematic development and validation of a predictive model

Exposure to ozone can cause several adverse health effects on human beings. Carbon-based filters are usually used for the removal of ozone from indoor air. The main problem with Carbon-based filters technology is the exhaustion of carbon because of irreversible reactions with ozone. Therefore, the knowledge of the service life of filters is crucial for building engineers and designers. Since testing at low indoor concentrations is time-consuming and expensive, the existing standards suggest experimenting with high concentrations. Thus, predictive models need to be developed to estimate the service life of filters. This work provides a model to estimate the breakthrough curves of three different combined (multi-layer) filters. The model augmented mass transfer equations with a reaction rate model and divided them into interpellet mass transfer and kinetic models. First, the reaction rate parameters were measured by fitting the model onto experimental data of all filters challenged with 9 ppm or 90 ppm of ozone. This was followed by validating the model for lower concentrations. In addition, to show the model validity for real-life application, its prediction was compared with the experimental data collected using the full-scale experimental setup and higher velocity. There was excellent agreement between the model prediction and the experimental results for all filters. Furthermore, an inter-model comparison was performed to determine the importance of different mass transfer steps. The results showed internal diffusion and axial dispersion as rate-limiting steps along with reaction. Finally, a sensitivity analysis was conducted on reaction kinetic parameters, axial dispersion coefficient, external mass transfer coefficient, and activated carbon particle porosity, which indicated negligible effects of external mass transfer and porosity variations.

Transient mathematical modelling and investigation of radiation and design parameters on the performance of multi-effect solar still integrated with evacuated tube collector

The advent of multi-effect solar still (MESS) provides an opportunity for improved yield, efficiency and gained output ratio (GOR) compared to the conventional still. It happens through the conservation of latent heat of evaporation from one stage to the next. In this present work, a lumped parameter model is developed to study the energy and exergy performance of the MESS. The transient solution for the varying solar energy supply is obtained using TRNSYS software. The TRNSYS and MATLAB linking available in TRNSYS software are effectively exploited to solve the heat transfer, mass transfer and exergy equations. An outdoor experiment was conducted using a MESS connected to an evacuated tube collector (ETC). The calculated results were compared with the experimental results, and a good agreement between them was observed. A maximum of 7.74% and a minimum of 1.62% error was observed between the experimental and numerical yield. Total yield, GOR and overall efficiency for a five-effect solar still were found to be 28.625 kg/m2day, 2.84 and 87.35%. The impact of the number of effects, basin size and basin water level on the yield, energy and exergy performance was also studied. The number of effects beyond seven shows no significant rise in water production. A lower amount of basin water and a higher evaporation area gives maximum yield and efficiency. However, a smaller basin area for the same quantity of water and energy supply has increased the water temperature to a higher value, eventually increasing exergy utilization. The yield, GOR and efficiency were maximum to be 8.6 kg, 3.36 and 109.01% for the basin area 0.56 m2 and 2 kg basin water quantity. The exergy efficiency was maximum to be 10.09% for the basin area of 0.16 m2 and 2 kg basin water quantity.

SIMULATION OF HEAT AND MASS EXCHANGE PROCESS HEAT EXCHANGER OF SIDE-EVAPORATIVE TYPE

It is known that the share of influence of the microclimate on the productivity of animals is about 20-25%. In the process of life, animals emit a large amount of heat, moisture, harmful gases, including carbon dioxide, ammonia and hydrogen sulfide. If the ventilation system does not work satisfactorily, the concentration of water vapor and harmful gases may exceed the standards, as a result of which animals drastically reduce productivity and may die. Currently, when creating livestock enterprises, it is necessary to resolve issues related to the reduction of investments, 40% of which is equipment. More than 20% of the cost of equipment falls on the heating and ventilation system; it is on it that they most often try to save money. Disagreements often arise between specialists on the deviation of microclimate parameters from optimal values for the productive qualities of farm animals. The article presents the physical and mathematical apparatus and methods for simulating the process of heat and mass transfer in an indirect-evaporative type heat exchanger for livestock buildings. The description of the process of heat and mass transfer in the heat exchanger of the indirect evaporative type of the Maisotsenko cycle is complex and requires the solution of many important mathematical problems (for example, the algorithmic solution of the combined heat and mass transfer on the surface with existing walls). Of particular importance is the development of an efficient algorithm that allows one to calculate differential equations of heat and mass transfer in partial derivatives. Therefore, the aim of the research is to describe the physical and mathematical apparatus and simulation technique (numerical simulation) of the heat and mass transfer process in an indirect evaporative type heat exchanger. As a result of analytical studies, the physico-mathematical apparatus of the process of heat and mass transfer in the heat exchanger of the indirect evaporative type of the Maisotsenko cycle was compiled, including the energy balance equation, taking into account sensitive and latent heat transfer on the surface of the wall of the wet and dry channels. The initial and limiting conditions of the heat and mass transfer model in the working part of the evaporative cooler under study are determined, which form the basis of numerical simulation in the Star CCM+ software package. A simulation technique (numerical modeling) has been developed and preliminary studies of the heat and mass transfer process in the heat exchanger of the indirect evaporative type of the Maysocenka cycle have been carried out. As a result of numerical simulation, the distributions of the temperature field, the vector field of velocities and the absolute humidity of the air flow in the heat exchanger of the indirect evaporative type of the Maysocenka cycle were obtained.

Unsteady MHD stream of Casson fluid over an elongating surface in the presence of thermal radiation and viscous dissipation

AbstractThe goal of this study is to analyze the impact of Casson fluid, physical parameters, and suction/injection on two‐phase mass transfer effects on unsteady magnetohydrodynamics flow over an elongating surface in the presence of thermal radiation and viscous dissipation. The system of nonlinear ordinary differential equations of flow, energy, and mass transfer are developed and computations have been carried out through the shooting method along with Runge–Kutta fourth and fifth‐order techniques. The graphs and tables are depicted and explained for the response to various embedded parameters. The are also analyzed for distinct values of . The observations of this examination are well detailed in the present research.

Mathematical Model of Radio Frequency Assisted Heat Pump Drying of Ganoderma Lucidum (Ganoderma Boninense)

This study proposed a mathematical model which was used to predict the temperature and moisture content of Ganoderma lucidum (Ganoderma boninense) during the radio frequency (RF) assisted heat pump (HP) drying process. The simultaneous heat and mass transfer equations were established based on the physical and flat plate models for drying Ganoderma lucidum and the specific assumptions for the proposed problem. The finite difference method was used to solve the proposed heat transfer and moisture transfer problem, in which, pdepe function was adjusted and complemented with Matlab software. The temperature and moisture content of the material in the drying process was predicted. The effect of the output RF power on the temperature and moisture content of the material was evaluated. The drying process's input parameters were drying air temperature of 40oC, air velocity of 1.2 m/s, and an output RF power of 1.95 kW, 0.65 and 0 kW. The results showed that when the output RF power increases, the heating rate increases, and the drying time is shortened significantly. The drying material temperature reaches the drying air temperature in 20 minutes, 30 minutes, and 220 minutes and the drying time is 465, 555, and 700 minutes, corresponding to output RF power of 1.95 kW, 0.65 and 0 kW. The predicted temperature and moisture content of the material were compared with experimental drying data, and a considerably good agreement was found.

Modelo matemático para estimar el coeficiente volumétrico de transferencia de oxígeno en biorreactores usando cálculo conformal

This work proposes a novel mathematical model based on time conformable derivative convective mass transfer equation to calculate the volumetric oxygen transfer coefficient (kLa) in a bioreactor. To validate the novel model, a full mixed-level experimental design was proposed with two factors: agitation speed and dispersed phase. The model employs the conformable derivate order operator (α) and the electrode constant (kp), which changes with electrode use and the operating conditions of the bioreactor. The results show that when the viscosity increases and the agitation decreases, the value α increases, and vice versa. Therefore, α is a parameter that has a physical meaning in the process. The correlation coefficient of the proposed model with the experimental data (R2 > 0.985) is higher than the one obtained with conventional models. The Akaike information criterion determined that the proposed conformal model describes the experimental data by 59%, while the conventional models describe the experimental data by 25% and 15%. There are no reports of similar mathematical models that determine mass transfer coefficients in bioprocesses.

The effect of gas injection velocity and pore morphology on displacement mechanisms in porous media based on CFD approach

Because of the unique advantages such as easy miscibility, high temperature resistance and so on, hydrocarbon gas flooding has proved to be a promising technology for enhanced oil recovery in deep reservoirs. In order to reveal the potential mechanism of miscibility and displacement of crude oil and hydrocarbon gas, an innovative two-dimensional physical field model is constructed by coupling Navier-Stokes equations and mass transfer equation. Accordingly, the effect of gas injection velocity and pore morphology on fluid transport and miscibility properties is investigated based on computational fluid dynamics approach. The simulation results demonstrated that the residual oil (RO) content is lower at low gas injection velocity than that at high gas injection velocity due to the better miscibility of fluids. For pore morphology, the RO content increases with increasing pore throat ratio and pore throat angle, which are not related to the gas injection velocity. The blocked pore structure has a negative effect on hydrocarbon gas flooding, resulting in the higher RO content. In addition, the influence of the pore throat length on the RO content is related to the gas injection velocity, which means the RO content increases at low gas injection velocity and decreases at high gas injection velocity with increasing pore throat length.

SORET AND DUFOUR EFFECTS ON MHD FLOW WITH HEAT AND MASS TRANSFER PAST AN EXPONENTIALLY STRETCHING SHEET

The current study aims to explore the impact of Soret and Dufour effects past a stretching surface with heat and mass transfer on MHD fluid flow including the effects of heat sink and radiation. Similarity transformations are employed to deduce the governing partial differential equations of flow, heat and mass transfer to system of nonlinear ODE’s. The equations together with boundary conditions so obtained are solved using numerical technique by employing Matlab’s solver bvp4c. The graph of fluid velocity, temperature and concentration distributions are obtained for different parameters for the deep analysis of the problem. It is observed that Soret and Dufour effects show notable contribution towards heat and mass transfer where the latter boosts the rate of mass transfer, and the former raises the heat transfer rate. The accuracy of the numerical solution is confirmed by comparing our results with the outcomes of previous work on stretching sheet and the results show good agreement.

A comprehensive 3D multi-physics coupled simulation model of slurry redox flow batteries

Slurry redox flow battery (SRFB) offers a high energy density and low cost solution for scalable storage of renewable energies. Here we present a 3D multi-physics coupled model for SRFB. This model incorporates the fluid dynamics of slurry flow, electrochemistry of lithium electrode reactions, transport of solid lithium in particles and mass balance in storage tank. The work introduces a molar mass transfer equation to convert the global solid lithium concentration change in slurry flow domain into a local reaction source on the electrode surface, which helps to accurately describe the dynamic state of charge (SOC) in SRFB considering flow convection. Simulations on this model have been conducted to predict the fluid dynamic and electrochemical performance of SRFB. The simulation results agree well with experimental results, which validate the further application of this model in optimizing SRFB designs.

Numerical simulation of a non-linear nanofluidic model to characterise the MHD chemically reactive flow past an inclined stretching surface

A computational approach is delineated for mass and heat transport enhancement/reduction process to control the drift of nanofluid. The fluid is drifting on the inclined stretched surface. This numerical study demands the resolution of fundamental (conservation momentum, mass transfer, and energy) equations and for which computational proficiency is a challenge. The time-dependent concentration and temperature on the periphery, together with stretched velocity, are the basis of the transient mixed convective laminar nanofluid flow. A similar transformations technique is imposed to adopt a system of time dominated non-linear fundamental equations and transformed it into a differential equation of the ordinary system. It is solved computationally by utilising the scheme of Nactsheim–Swigert shooting along with the iteration process, namely Runge–Kutta of order six. The obtained model depends on diversified natural parameters and is narrated on several profiles. Moreover, an explicit scheme has also been imposed to illustrate the developed visualisation of the fluid flow with the aid of streamlines and isothermal lines. Here, the stretching parameter demonstrates a provoking character on the momentum boundary layer, and the Prandtl number depicts an insignificant minimal impact on the mass transfer flow. The accuracy of this model is found satisfactory by validating with experimental data and comparing it with the previous numerical tests. This investigation has applications in engineering industries in thermal nano-technological materials processing and manufactures.

Numerical investigation on the thermal-hydraulic performance of separated structure steam generator with different tube arrangements

The horizontal steam generator is generally used in nuclear power plant and industry to produce steam. To increase the heat load and reduce the size, a steam drum can be added above the shell. However, it makes the overall flow of water cycle complicated. In this article, the two-phase boiling flow and heat transfer inside tube bundle under the separated structure has been investigated numerically based on the previous experiment. The Drift-Flux model was utilized to solve the equations of heat and mass transfer in the mixture flow. The local pressure drop, void fraction and heat transfer characteristics have been presented and discussed for different arrangements in detail. The analysis results showed that the overall boiling HTC of the tube arrangements of 30°and 60° appear better for this steam generator under the same condition. The boiling heat transfer in both bottom and upper tube bundle was mainly controlled by the nucleate boiling mechanism. However, both heat flux and vapor void fraction were found to affect the heat transfer performance. Beyond this analysis, a new type of heat transfer correlation has been proposed herein to evaluate the local HTC with a good accuracy. These correlations allow better predictions of the boiling heat transfer inside the SS-SG, which provide designers with better reference and guidance.

Prediction models of air outlet states of desiccant wheels using multiple regression and artificial neural network methods based on criterion numbers

• Study simple and general models to calculate air outlet states of desiccant wheels. • Get 3 basic dimensionless numbers through nondimensionalizing physical equations. • Calculate 2500 groups original data with the nondimensionalized mathematic model. • Errors of the multiple regression formulars are from ±5% to ±15%. • Errors of the model using BP artificial neural network are from ±5% to ±10%. In this study, multiple regression and artificial neural network methods were applied to desiccant wheels to calculate the dimensionless outlet temperatures and humidity ratios of the processed air (A pro ) and regeneration air (A reg ). First, coupled heat and mass transfer equations expressing the relationship between the air and desiccant wheel were nondimensionalized to obtain seven criterion numbers, including three basic criterion numbers. The three basic criterion numbers were related to the structural and operating parameters of desiccant wheels and the physical parameters of the air and desiccants. Subsequently, the value ranges of the three basic criterion numbers were obtained based on the ranges of the above parameters. Based on a wide range of air inlet conditions and value ranges of the three basic criterion numbers, 2500 cases were designed. The nondimensionalized equations were used to calculate the dimensionless outlet temperatures and humidity ratios of A pro and A reg for the 2500 cases. Next, a multiple regression method was used to regress formulas for a fixed air inlet condition based on the original calculated results. The formulas were related to the three basic criterion numbers and could be used to calculate the dimensionless outlet temperatures and humidity ratios of A pro and A reg . Compared with the original data, the prediction errors of the formulas ranged from ±5% to ±15% for the analyzed working conditions. Finally, based on the 2500 original data groups, the backpropagation neural network was used to predict the dimensionless outlet states of A pro and A reg , with the three basic criterion numbers and air inlet conditions as the inputs. Compared with the original data, the prediction errors of the four dimensionless outputs mainly ranged from ±5% to ±10%. The difference between the two prediction methods was within ±10%.

Effect of Heat Source on MHD Flow Through Permeable Structure under Chemical Reaction and Oscillatory Suction

Magnetohydrodynamics (MHD) deals with the study of the magnetic properties and behaviour of electrically conducting fluids. In literature, researchers have studied. The study of MHD is widely applied in drawing of plastics and elastic sheets, metal and polymer expulsion forms, paper creation, cooling of metallic sheets, etc. Most of the previous researchers have studied only the concentration and velocity boundary layer profiles. However, the effect of heat sources using temperature boundary layer profiles is not studied. Therefore, in this work, an analysis of a convective flow of an electrically conductive, viscid compact fluid through a perpendicular plate which is porous with oscillatory suction with first-order temperature and chemical reaction and the transverse magnetic field is carried out. The developed model consists of continuity, momentum, and heat and mass transfer equations, and the perturbation technique was applied in order to find the result for the velocity field, temperature profiles, and concentration distributions. Further, the influence of the flow variables on the temperature field, velocity field, and concentration dispersal was analyzed and the results were depicted graphically. Moreover, the skin friction and the rate of mass transfer (local Sherwood number) were analyzed using tables. In this work, an unstable 2D flow of a laminar, viscid (Newtonian), electrically conducting fluid across a semi-limitless perpendicular permeable plate under motion in its plane (x-axis) embedded in a constant permeable structure was investigated.

NUMERICAL SIMULATION OF ATMOSPHERIC POLLUTION DURING AN EXTREME SITUATION AT A CHLORINE OVERFLOW STATION

Problem statement. The problem of forecasting the dynamics of the formation of zones of chemical pollution due to accidental emissions of chlorine at the chlorine overflow station is considered. There is a large village near this chlorine overflow station, so in case of an emergency there is a risk of toxic damage to people. From this point of view, the development of effective multidimensional mathematical models to predict the formation of zones of chemical contamination is of great relevance. The purpose of the article. Development of a numerical multi-parameter model and computer program for forecasting the dynamics of air pollution due to accidental leakage of chlorine at the chlorine station. Methodology. For mathematical modeling of the propagation of a chemically hazardous substance, a three-dimensional equation of mass transfer is used (the equation of G.I. Marchuk). This modeling equation takes into account different wind directions, changes in the vertical coefficient of atmospheric diffusion with height, the intensity of the release of a chemically hazardous substance, and the location of the emission source. For the numerical integration of the three-dimensional mass transfer equation, finite-difference splitting schemes are used. First, for the modeling equation of mass transfer, its physical splitting is carried out: the equations of transfer due to velocity and due to diffusion are considered separately. Also, a separate step is to change the concentration of a chemically hazardous substance due to the action of a pollution source. Next, a difference splitting scheme is constructed. At each step of the splitting, the value of the concentration of a chemically hazardous substance is determined according to an explicit scheme. Scientific novelty. A numerical model is proposed to calculate the dynamics of accidental air pollution due to the release of chemically hazardous substances. The mathematical model takes into account the physical factors that significantly affect the process of distribution of chemically hazardous substances in the atmosphere. Practical significance. Based on the developed model, a code is created that allows you to quickly calculate the process of accidental air pollution. The mathematical model can be used in developing an emergency response plan. Conclusions. The developed mathematical model and the computer code that implements it allow us to study the dynamics of the spread of chemically hazardous substances in the air. The developed computer program can be implemented on low and medium power computers. The results of a computational experiment are presented.

Passive scalar transfer rate at bubble interface in Carreau liquid in a transition regime

The scalar transfer rate from a bubble to a quiescent fluid with Carreau rheological behavior is studied here with Bond and Galilei number values respectively equal to 30 and 2 and a non-dimensional inelastic time constant (λ) equal to 6. Under these conditions the bubble dynamics regime stays within the steady and oscillatory areas. Navier Stokes equations are solved numerically in a non-stationary three dimensional domain and are coupled to the mass transfer equation of a scalar. The effect of the Peclet number (Pe) and flow index (n) of the quiescent fluid on the Sherwood number is explored within the following range: 10<Pe<1000, and 0.3<n<1.7. We observed that the shear thinning rheology destabilizes the bubble flow dynamics from steady towards an oscillatory regime and increases transfer rates between the bubble and surrounding fluids. This trend became even more prominent as Pe increased. Our results are condensed into an empirical predictive correlation that outperforms previous similar correlations and can be used to estimate the heat and mass transfer rate at the bubble interface in a Carreau liquid in a transition regime at a specific Galilei and Bond numbers.

Bridging the gap between mesoscopic and molecular models of solid/liquid interfaces out-of-equilibrium

Solid/liquid interfaces control various processes of technological relevance in the process industry and many fundamental physicochemical phenomena. This work examines the link between the atomistic description of mass transfer at solid/liquid interfaces out of equilibrium and constitutive mass transfer equations which are typically used to model these processes at the mesoscale. In our analyses we discuss the microscopic inconsistencies apparent in simplified models of mass transfer whenever non-idealities dominate the liquid phase in the proximity of solid/liquid interfaces. Using CμMD – a molecular simulation technique to investigate out-of-equilibrium, concentration-driven processes with pseudo open-boundary conditions – we outline a strategy to capture and quantify non-idealities induced by specific interactions between the solid surface and molecules in the fluid phase. We demonstrate our approach by studying electrolyte solutions in technologically important, multi-component systems where the introduction of a solid/liquid interface induces substantial deviations in the composition and electrochemical properties locally compared to the bulk fluid phase. To this aim, we analyse NaCl(aq) solutions in contact with (i) the graphite basal surface and (ii) {100} NaCl(s) crystalline surfaces. We uncover the tendency of the sodium cation to preferentially adsorb at the surfaces considered, which induces local violations of electroneutrality that leads to the emergence of an electric potential in the fluid phase at the solid/liquid interface.

NUMERICAL STUDY OF THE SHIELDING PROPERTIES OF A FERROFLUID TAKING INTO ACCOUNT MAGNITOPHORESIS AND PARTICLE INTERACTION

Shielding properties of a cylindrical thick-walled ferrofluid layer that protects against externally applied uniform magnetic fields are numerically investigated. We take into account the diffusion of magnetic nanoparticles in the ferrofluid with magnetic dipole-dipole, steric and hydrodynamic interactions between particles. Permeability of the ferrofluid is considered to be dependent on the magnetic-field strength and the particle concentration. A combined method of finite differences and boundary elements is applied to solve a nonlinear transmission problem of magnetostatics in the whole space, augmented by nonlinear algebraic equations based on the mass transfer equation for magnetic nanoparticles in ferrofluids. Numerical experiments revealed that the diffusion of particles has negligible influence on the shielding properties at weak and strong intensities of the applied magnetic field when comparing with the results of computations for a uniform particle distribution.

Конвективная сушка пиломатериалов на основе управляемого влагообмена

Wood drying (in particular lumber drying), which almost entirely determines the quality of the wooden products, is one of the most complicated and energy-consuming processes in wood processing. Convective drying of lumber, in all its varieties, remains the most common by far. Computer modeling of wood drying processes is usually based on solving systems of differential heat and mass transfer equations. The methods for solving such systems, both analytical and numerical, are well researched and developed. However, the most important methodological issue is the correct formulation of the boundary conditions that determine the process of interrelated heat and mass transfer at the interface (wood – moist air). The convective drying has traditionally used the boundary conditions of type III by Academician A.V. Lykov, which are characterized by a sufficiently close correspondence between the mass flows moving from the wood depth and at the interface. This correspondence is described by the value of the so-called Bio mass transfer criterion. A computational experiment was carried out to verify these assumptions. It enabled to determine the possible controllability of the moisture removal during low-temperature convective drying of conventional lumber using modes of three-step and stepless structure. Besides this, the influence of the moisture removal on the dynamics of the internal stresses in wood was also studied. The results have shown that the stepless drying modes, on the one hand, offer a significant improvement in drying quality with practically no loss of drying capacity, and on the other hand, have better controllability. The results of the previously conducted and mentioned studies made it possible to propose general principles and then to patent a system for automatic control of moisture transfer during wood drying, which is fundamentally different from the previously known wood drying control systems. The system controls the drying process by adjusting the ratio of external to internal moisture transfer, rather than the value of the media parameters in the chamber. The moisture transfer control system for convective drying of lumber is of limited control: it cannot fully stabilize the values of the Bio mass transfer criterion. However, its use maintains a certain balance between internal and external moisture transfer, ensures the required drying quality and almost completely eliminates the occurrence of defects. For citation: Gorokhovsky A.G., Shishkina E.E., Agafonov A.S. Lumber Convective Drying Based on Controlled Moisture Transfer. Lesnoy Zhurnal [Russian Forestry Journal], 2022, no. 1, pp. 166–172. DOI: 10.37482/0536-1036-2022-1-166-172