Convection Flow Of Fluid Research Articles

Exploring the dynamics of natural convective Prandtl fluid flow subjected to induced magnetic field

In the present study, Prandtl fluid flows naturally under the action of buoyancy in a vertical microchannel. The channel proliferates the fluid to the surrounding through small pores in the channel. Fluid flow properties are explored and heat transfer analysis is carried out theoretically via mathematical modeling using fluid dynamic conservative laws. Magnetohydrodynamics effect is also made a part of the study so that the induced magnetic field impact can be investigated. The mathematical form of the conservative laws leads to a differential system nonlinear in nature. The complexity of the mathematical system demands its solution to be carried out numerically. For this purpose, the finite difference-based Keller box method is utilized. Interpretation of the results is carried out in the form of graphs and tables of numerical values of the skin friction coefficient and the Nusselt number. The results show that the Prandtl number coupled with the suction velocity parameter results in an exponential growth in the heat transfer rate in Prandtl fluid. Graphical representations confirm the fact that skin friction coefficient peaks when the value of Hartmann number is minimum and that of Grashof number is maximum.

Unsteady MHD free convective flow past a moving vertical plate in a porous medium with radiation and chemical reaction including arbitrary thermal and solutal ramped condition

AbstractThe motive behind this investigation is to examine the unsteady magnetohydrodynamics free convective fluid flow with heat and mass transfer of a viscous, incompressible flow past a moving upright plate in a porous medium with radiation, chemical reaction, arbitrary thermal, and solutal ramped condition. An analytical solution for momentum, energy, and concentration equations is accomplished by implementing the Laplace transformation technique. The influence of different nondimensional parameters on fluid velocity, temperature, and concentration along with skin friction and rate of heat transfer as well as mass transfer at the plate are exhibited graphically. It can be spotted that both the concentration and temperature field decrease for rising values of the ramped parameter, radiation parameter, chemical reaction parameter, and Schmidt number. Moreover, it is detected that the fluid velocity drops in the case of the isothermal plate, and velocity upsurges for the ramped plate temperature. Investigation simulates that the rate of heat transfer, as well as rate of mass transfer, is escalated on hiking radiation parameter.

Visualization of non-Newtonian convective fluid flow with internal heat transfer across a rotating stretchable surface impact of chemical reaction

The present investigation focuses on the characteristics of heat and mass transfer in the context of their applications. There has been a lot of interest in the use of non-Newtonian fluids in engineering and biological disciplines. Having such considerable attention to non-Newtonian fluids, the goal is to explore the flow of Jeffrey non-Newtonian convective fluid driven by a non-linear stretching surface considering the effect of nonlinear chemical reaction effect. The relevant set of difference equations was changed to ordinary equations by using a transformation matrix. To create numerical solutions for velocity and concentration fields, the Runge–Kutta fourth-order method along with the shooting approach is utilized. The innovative fragment of the present study is to scrutinize the magnetized viscous non-Newtonian fluid over extending sheet with internal heat transfer regarding the inspiration of nonlinear chemical reaction effect, which still not has been elaborated on in the available works to date. Consequently, in the restrictive sense, the existing work is associated with available work and originated in exceptional agreement. Graphs depict the effects of various variables on motion and concentration fields, like the Hartman number, Schmidt number, and chemical reaction parameter. The performance of chemical reaction factor, Schmidt number, Hartmann number, and Deborah numbers on velocities component, temperature, and concentration profiles are discussed through graphs. The effect of emerging parameters in the mass transfer is also investigated numerically and 3D configuration is also provided. It is observed that the Deborah numbers and Hartmann numbers have the same effect on velocity components. Also, the thickness of the boundary layer reduces as the Hartmann number increases. As the Schmit number grows, the concentration field decline. For destructive and generative chemical reactions, the concentration fields observed opposite effects. It is also noticed that the surface mas transfer reduces as the Hartmann number rises. The statistical findings of the heat-transfer rate are also documented and scrutinized.

Numerical Solution of Mixed Convection MHD Viscous Fluid Flow on Lower Stagnation Point of a Sliced Magnetic Sphere

This paper considers mathematical modeling on mixed convection MHD viscous fluid flow on the lower stagnation point of a magnetic sliced sphere. The study began with transforming the governing equations which are in dimensional partial differential equations to non-dimensional ordinary differential equations by using the similarity variable. The resulting similarity equations are then solved by the Keller-Box scheme. The characteristics and effects of the Prandtl number, the sliced angle, the magnetic parameter, and the mixed convection parameter are analyzed and discussed.

Convective MHD Fluid flow over Stretchable Rotating Disks with Dufour and Soret Effects

Convective MHD Fluid flow over Stretchable Rotating Disks with Dufour and Soret Effects

Manipulation of Fluid Convection by Surface Lattice Resonance

AbstractThe capability of plasmonic metasurfaces (PMs) under illumination to generate heat and induce fluid convection is a promising building approach for optofluidic applications. However, the low quality (Q)‐factor in PMs introduced into optofluidic applications remains a challenging problem. In this paper, a PM optofluidic platform based on surface lattice resonance (SLR) with a highQ‐factor is proposed. Numerical results demonstrate that SLR‐based metasurfaces can manipulate the convective flow of fluid at the nanoscale, with theQ‐factor approaching 138. Moreover, compared to the localized surface plasmon resonance‐based metasurface, the SLR‐based metasurfaces exhibit improved absorption, temperature rise, and flow velocity performance. In particular, the absorption coefficient at the SLR peak in an adequately designed PM can be close to unity. This study reveals that SLR is an efficient and alternative method to manipulate the fluid flow, and paves the way to flexible wavelength‐scale devices for optofluidic applications.

Unsteady incompressible flow of magnetized aluminium oxide and titanium oxide nanoparticles with blood base fluid

In this investigation, a mixed convective nanoparticles fluid flow over an inclined plate is deliberated. The effects of slip boundary wall and magnetic field are also considered. The dimensionless governing system for the considered problem is attained by implementing recent definitions of fractional derivatives (FD). The generalized solution is obtained through the Laplace Transformation Scheme (LTS) for the momentum and thermal expressions. To improve the novelty and to demonstrate some more physical perception of the stated research work, some remarkable special cases of velocity distribution through CF and AB-fractional derivative concept are addressed, whose daily life implication is well known in the existing literature. Moreover, to evaluate the physical interest of the stated problem, the outcomes of the obtained system graphical illustrations are made by utilizing MATHEMATICA. As a result, we concluded that the aluminium oxide Al2O3 nanoparticles show more decaying behavior as compared to titanium oxide TiO2 nanoparticles for temperature and velocity profile. Furthermore, both fields i.e., momentum and thermal distributions are increased with the help of rising estimations parameter. Current results report novel applications in enhancement of heat transfer, thermal engineering, chemical processes, engineering and electronics devices, solar systems, extrusion processes, fission reactions etc.

Unsteady MHD Flow through Porous Media with Temporal Variation in Temperature and Concentration at the Plate

The present analysis aims at to the free convective unsteady MHD flow of a viscous fluid through a saturated porous medium, considering the radiative heat loss and chemical reaction of the diffusing species in the presence of an exponential time varying cross flow. The novelties of the present analysis are that the electrically conducting fluid is made to flow through saturated porous medium subjected to transverse magnetic field; the presence of constant volumetric heat source acts as an internal thermal power within the boundary layer; the principle of superposition underlying basis of method of analytical solution. Some important findings of the study are that the flow model acts as a surface-coolant and it lowers down the bounding surface-concentration also; the imposed magnetic field, thermal radiation, porosity of the saturated porous medium and the destructive chemical reaction of the diffusing species have effects on progressive thinning of the boundary layer.

Investigations of nanofluid flow and heat transfer in a rotating microchannel using single- and two-phase approaches

The impacts of single- (SPM) and two-phase models (TPMs), including Euler-Lagrange (ELM) and Eulerian-Eulerian models (EEM), on a laminar forced convection heat transfer and fluid flow of the nanofluid are evaluated in a rotating U-shape microchannel with a square cross-section and constant wall temperature. The effects of Reynolds numbers, rotational speed, volume fraction, Brownian motion, and implementation of no-slip and slip conditions are investigated. The slip velocity and heat transfer increase by increasing the volume fraction and rotational speed. The EEM and ELM provide a higher total Nusselt number than the SPM. The maximum heat transfer augmentations of 53.3%, 45.7%, and 41% are achieved for the EEM, ELM, and SPM by increasing the rotational speed from zero to 600 at ϕ = 5%. The predictions of pressure drop by TPMs are essentially the same but considerably lower than SPM. Unlike the ELM, the nanoparticle concentrations of EEM and SPM are uniform.

The effects of MHD radiating and non-uniform heat source/sink with heating on the momentum and heat transfer of Eyring-Powell fluid over a stretching

The analysis of heat dissipation over a layered stretching sheet under the control of magneto-hydrodynamic mixed convective flow of Eyring-Powell fluid is described in this study. The effect of heat emission and immersion is investigated. A viscous, incompressible, two-dimensional, and laminar fluid is assumed. The governing equations of momentum and temperature pictures are translated into a collection of non-linear differential equations using conformable similarity transformations. To obtain the mathematical solution of the governing equations, the shooting approach is modified. Fourth-order Runge-Kutta formulation is applied for the integration and Newton's formulation suffices to simplify initial guess values. MATLAB is used for all the programming. The effect of respective distinct flow parameters on the temperature, velocity, represented through graphical forms, and the interpretation of some helpful engineering aggregates such as the skin-friction coefficient and Nusselt number are explained graphically for different variables. It has been shown that increasing the thermal stratification parameter reduces fluid velocity and also temperature, and vice versa is noticed for the heat production variable.

The analysis of amplitude and phase angle of periodic mixed convective fluid flow across a non-conducting horizontal circular cylinder

The present contribution deals with the study of amplitude and phase angle of periodical mixed convective fluid flow along the non-conducting circular cylinder. The surface of cylinder is thermally and electrically conducting by keeping surface temperature as a time dependent variable. The developed dimensionless equations are transformed into analytical expressions for flow characteristics by using primitive variable formulation which converts nonlinear PDE’s into primitive form for numerical data. The graphical representations of physical properties phase angle and amplitude are obtained for various values of Prandtl number Pr, mixed-convection parameter λ , magnetic-Prandtl number γ and magnetic force parameter ξ respectively. To demonstrate important properties of the solution, a parametric study is conducted for governing parameters and a set of graphical and numerical outcomes is analyzed. The amplitude of time dependent skin friction τ w , heat transfer q w and current density j w has been observed on suitable positions of the non-conducting cylinder π / 6 , π / 4 , π / 2 , 3 π / 4 , 5 π / 6 and π numerically. It is noticed that the maximum amplitude of time dependent skin friction τ w , heat transfer q w and current density j w is noted at position α = π / 2 by increasing the various amount of physical pertinent parameters.

Unsteady forced convection flow and heat transfer past a blunt headed semicircular cylinder at low Reynolds numbers

A numerical analysis is performed to study the forced convective fluid flow and heat transfer past an unconfined semicircular cylinder. The two-dimensional simulations are carried out for Reynolds number ranging 10 ≤ Re ≤ 200 and operating fluid is air (Pr = 0.71) for Newtonian constant property fluid. Continuity, Navier-Stokes, and energy equations with appropriate boundary conditions are solved using computational fluid dynamics solver Ansys Fluent. Various parameters flow such as lift, drag, skin friction coefficient, pressure coefficient, Nusselt (Nu) number, Strouhal (St) number, and vortex strength are calculated. The transition from steady to time periodic flow occurs between Re = 60 and 80. The effect of Reynolds number on heat transfer is discussed. Finally, a developed correlation of Nu and St numbers are presented.

HEAT TRANSFER OF MHD OLDROYD-B FLUID WITH RAMPED WALL VELOCITY AND TEMPERATURE IN VIEW OF LOCAL AND NONLOCAL DIFFERENTIAL OPERATORS

The theoretical study focuses on the examination of the convective flow of Oldroyd-B fluid with ramped wall velocity and temperature. The fluid is confined on an extended, unbounded vertical plate saturated within the permeable medium. To depict the fluid flow, the coupled partial differential equations are settled by using the Caputo (C) and Caputo Fabrizio (CF) differential time derivatives. The mathematical analysis of the fractionalized models of fluid flow is performed by Laplace transform (LT). The complexity of temperature and velocity profile is explored by numerical inversion algorithms of Stehfest and Tzou. The fractionalized solutions of the temperature and velocity profile have been traced out under fractional and other different parameters considered. The physical impacts of associated parameters are elucidated with the assistance of the graph using the software MATHCAD 15. We noticed the significant influence of the fractional parameter (memory effects) and other parameters on the dynamics of the fluid flow. Shear stress at the wall and Nusselt number also are considered. It’s brought into notice the fractional-order model (CF) is the best fit in describing the memory effects in comparison to the C model. An analysis of the comparison between the solution of velocity and temperature profile for ramped wall temperature and velocity and constant wall temperature and velocity is also performed.

Analysis of sensitivity of thermal conductivity and variable viscosity on wall heat flux in flow of viscous fluid over a porous wedge

The author aims to discuss sensitivity of pertained parameter for a two dimensional convective wedge flow of Newtonian fluid having varying viscosity and conductivity over a semipermeable wedge surface using Response Surface Methodology (RSM). The transformed boundary layer equations forms partial differential equations which in turn are becomes a set of non-linear ordinary differential equations by use of regular perturbation method. These systems are solved numerically by the use of Matlab built in routine bvp4c respectively. The obtained results found quite comparable with those already presented in literature by other methodologies. We have made a statistical experimental design based on parametric ranges of governing parameters of the problem. We have then calculated the local wall shear stress and local wall heat flux numbers as responses for all combination of parameters in experimental design. Then we use RSM by using Central Composite Design (CCD) in order to develop a correlation between responses either Cfx or Nux and governing parameters of the problem. After developing a best fitted response surfaces for each of the response variables we have performed a detailed sensitivity analysis for each of the response surface.

Arterial vasodilation drives convective fluid flow in the brain: a poroelastic model

The movement of fluid into, through, and out of the brain plays an important role in clearing metabolic waste. However, there is controversy regarding the mechanisms driving fluid movement in the fluid-filled paravascular spaces (PVS), and whether the movement of metabolic waste in the brain extracellular space (ECS) is primarily driven by diffusion or convection. The dilation of penetrating arterioles in the brain in response to increases in neural activity (neurovascular coupling) is an attractive candidate for driving fluid circulation, as it drives deformation of the brain tissue and of the PVS around arteries, resulting in fluid movement. We simulated the effects of vasodilation on fluid movement into and out of the brain ECS using a novel poroelastic model of brain tissue. We found that arteriolar dilations could drive convective flow through the ECS radially outward from the arteriole, and that this flow is sensitive to the dynamics of the dilation. Simulations of sleep-like conditions, with larger vasodilations and increased extracellular volume in the brain showed enhanced movement of fluid from the PVS into the ECS. Our simulations suggest that both sensory-evoked and sleep-related arteriolar dilations can drive convective flow of cerebrospinal fluid not just in the PVS, but also into the ECS through the PVS around arterioles.

Intelligent neuro-computing for entropy generated Darcy–Forchheimer​ mixed convective fluid flow

In the present article, the Darcy–Forchheimer mixed convective flow model (DFMC-FM) is examined by utilizing the algorithm of Levenberg Marquardt with backpropagated artificial neural networks (ALM-BANN). Partial differential equations representing the proposed DFMC-FM are converted to non-linear ordinary differential equations (ODEs) by similarity transformation. These ODEs are solved by Adam numerical method to interpret the reference dataset of ALM-BANN for various scenarios of DFMC-FM by varying curvature parameter, Forchheimer number, chemical reaction parameter, slip parameter, Schmidt number and activation energy parameter. By testing, validation and training process, the solutions for designed DFMC-FM are interpreted. The performance analysis of DFMC-FM is validated through regression analysis, error histogram studies and MSE results. Graphs are given in figures for velocity profile, temperature profile and concentration profile. The velocity and temperature distributions show an increasing behavior with the upsurge in the curvature parameter, whereas the velocity profile decreases with the growth in Forchheimer number and slip parameter. An increase in the chemical reaction parameter and Schmidt number values leads to a decline in concentration profile, but the increase in activation energy parameter increases the concentration profile.

Forced convective MHD flow of Reiner-Philippoff fluid induced by hybrid nanofluid past a nonlinear moving sheet with nonlinear heat sink/source

The utilization of hybrid nanofluids is important in industry because of their high effective thermal conductivity, resulting in high heat transfer rates. The present work examines the influence of nonlinear heat sink/source on forced convective flow induced by Reiner–Philippoff fluid conveying hybrid nanofluid through a moving sheet. Using similarity variables, the PDEs in the current model are transformed into ODEs. Furthermore, the bvp4c approach is used to deal with the dimensionless model. Graphs depict the effects of various physical factors discovered during the scrutiny of numerical simulation on the temperature, heat transfer rate, friction factor, and velocity field. It’s worth noting that increasing the heat source/sink parameters reduces the temperature. Furthermore, increasing the Bingham number parameter increases the temperature and decreases the velocity. A change in the volume fraction parameter augments the temperature and declines the velocity field. The numerical results’ reliability is determined by comparing the acquired results to the existing literature.

Combined Influence of Thermal Radiation, ThermoDiffusion, Radiation Absorption on Mixed Convective Heat and Mass Transfer Flow of a Micropolar Fluid in a Vertical Channel with Variable Temperature in the presence of Heat Sources

The purpose of the present chapter is to analyze the thermal radiation, radiation absorption and thermo-diffusion on mixed convective heat and mass transfer flow of a micropolar fluid between two vertical parallel plates with varying temperature in the presence of heat sources. Such type of study may be applicable in nuclear reactors, heat exchangers and various electronic devices. The non-linear governinmg equations have been solved by employing Galerkin finite element technique with three nodded line segments.The velocity ,micro-rotation temperature and concentration have been analysed for different variations of Rd,Sr,Q1 , and p

MHD free convective non-Newtonian Casson fluid flow over an oscillating vertical plate

The goal of this investigation is to examine magnetohydrodynamic​ natural convective, mass and heat transfer, performing non-Newtonian Casson fluid flow through an oscillating straight up permeable plate with the existence of thermal diffusion (Soret). Finite element approach (FEM) is implemented to overcome non-dimensional PDEs for distribution of velocity, temperature & concentration of Casson fluid by the impact of different dimensional variables. Local skin-frication, heat and mass transfer rate are often extracted as well as analyzed by graphical ways. The analysis shows that the concentration and velocity of Casson fluid are increased as an enhancement of Soret number. Velocity of Casson fluid increased as an increment of Grashof numbers for heat and mass transfer. Additionally, the flow velocity decreases with the rising values of Casson fluid, phase angle and magnetic field parameters however it enhances with the rising of permeability parameter. Furthermore, the temperature profiles diminished with the growing of Prandtl number. The solutions of the present investigation have been compared with the existing literature in certain circumstances and great agreement were achieved.

An Optimal Investigation of Convective Fluid Flow Suspended by Carbon Nanotubes and Thermal Radiation Impact

This study is focused towards analyzing the heat and flow movement among two stretching rotating disks inside water-based carbon nanotubes. The idea of thermal boundary conditions and heat convection is used and the system is expressed in partial differential equations. Using the similarity techniques, the model is successfully converted to a nonlinear ordinary differential equation. A familiar collocation method is used to simulate the outcomes of the governed system while the method is validated through a set of tables and assessed with existing literature. The physical aspects of the proposed model have been studied in detail and assisted via graphical diagrams against the variation of different parameters. It is found that the multiple-wall carbon nanotubes intensify the system quickly and improve the rate of heat transmission. It is also noted that the proposed method is in excellent in agreement with already published studies and can be extended for other physical problems. Moreover, when values of Re parameter increase, a drop is noted in the magnitude of radial velocity near the faces of the disks. It is very clear from the tabular comparison that collocation scheme is in good agreement with already published studies and homotopic solutions.