Increase In Fluid Temperature Research Articles

A numerical study on thermo-hydraulic performance of micro pin-fin heat sink using hybrid pin-fins arrangement for electronic cooling devices

PurposeThis study aims to examine the effect of a combination of hybrid pin-fin patterns on a heat sink's performance using numerical techniques. Also, flow characteristics have been studied, such as secondary flow formation and flow-wall interaction.Design/methodology/approachIn this study, the effect of hybrid arrangements of elliptical and hexagonal pin-fins with different distribution percentages on flow characteristics and performance evaluation criteria in laminar flow was investigated. Ansys-Fluent software solves the governing equations using the finite volume method. Also, the accuracy of obtained results was compared with the experimental results of other similar papers.FindingsThe results of this study highlighted that hybrid arrangements show higher overall performance than single pin-fin patterns. Among the hybrid arrangements, case 3 has the highest values of performance evaluation criteria, that is, 1.84 in Re = 900. The results revealed that, with the instantaneous change in the pattern from elliptic to hexagonal, the secondary flow increases in the cross-sectional area of the channels, and the maximum velocity in the cross-section of the channel increases. The important advantages of case 3 are its highest overall performance and a lower chip surface temperature of up to about 2% than other hybrid patterns.Originality/valuePrior research has shown that in the single pin-fin pattern, the cooling power at the end of the heat sink decreases with increasing fluid temperature. Also, a review of previous studies showed that existing papers had not investigated hybrid pin-fin patterns by considering the effect of changing distribution percentages on overall performance, which is the aim of this paper.

Effect of synovial fluid temperature on wear resistance of different polymer acetabular materials.

In order to investigate the effect of frictional heat on the wear resistance characteristics of polymeric acetabular materials, the tribological tests and wear numerical analysis of three common polymer acetabular materials were carried out under different synovial fluid temperatures. The study results show that XLPE and VE-XLPE exhibit superior wear resistance compared to UHMWPE in high-temperature, heavy load environments. The coefficient of friction of three materials gradually decreases as the temperature of the synovial fluid increases. The wear depth and wear volume of the three materials increased with the increase of the temperature of the synovial fluid, and the forms of wear at 46°C and 55°C were mainly adhesive wear and plastic deformation. The higher temperature of the synovial fluid accelerates the oxidative degradation of the material surface and generates oxidation functional groups, which leads to the breakage of C-C bonds in the surface molecular chains under the sliding shear effect, thus reducing the mechanical properties of the material. Specifically, the surface of the polymer material will soften at a higher ambient temperature, mainly due to the decrease of hardness, and then deteriorate in the friction property, and finally increase the wear rate. Ansys results showed that the volume wear of the three materials increased with the increase of synovial fluid temperature, and the trend could be approximately linear. Numerical calculations predict that VE-XLPE has the highest wear of 0.693mm3 among the three materials at 37°C, followed by XLPE at 0.568mm3 and UHMWPE with the lowest wear of 0.478mm3. At higher synovial fluid temperatures (46°C, 55°C), VE-XLPE still has the largest wear volume among the three materials, while XLPE and UHMWPE have similar wear. The wear cloud pictures showed that the maximum wear volume occurred near the edge of the acetabulum.

LTNE effect on non-linear radiative MHD mixed convective flow in an annular porous medium: Intelligent Computing Paradigm

In this study, the back-propagated Levenberg-Marquardt algorithm-based neural network intelligent computing paradigm is used to examine the influence of non-linear thermal radiation, induced magnetic field and local thermal non-equilibrium effect on the magnetohydrodynamic mixed convective flow in the vertical annular porous region. In the annular porous region the inner cylinder is considered as electrically conducting and the outer cylinder as electrically non-conducting. The heat transfer is expected due to mixed convection and non-linear thermal radiation. The Galerkin finite element method is adopted to solve the governing equations. In the vertical annulus an increase in the magnetic Prandtl and Hartmann number reduces the velocity and induced magnetic field due to a strong external magnetic field and the Lorentz force. The higher Brinkmann values decelerate the conduction of heat generated by viscous dissipation hence, the temperature increases. The fluid and solid temperature increase with the buoyancy parameter. The non-linear radiation term enhances the fluid temperature, whereas it decelerates the solid temperature. The ANN model utilises finite element method output for training, validating and testing to predict the heat transfer characteristics. The performance of the BLM-NN algorithm is assessed using mean square error, error histogram and regression.

Time-Dependent Magnetohydrodynamic (MHD) Flow of an Exothermic Arrhenius Fluid in a Vertical Channel with Convective Boundary Condition

The current study examined the effects of magnetohydrodynamics (MHD) on time-dependent mixed convection flow of an exothermic fluid in a vertical channel. Convective heating and Navier’s slip conditions are considered. The dimensional nonlinear flow equations are transformed into dimensionless form with suitable transformation. For steady-state flow formations, we apply homotopy perturbation approach. However, for the unsteady-state governing equation, we use numerical technique known as the implicit finite difference approach. Flow is influenced by several factors, including the Hartmann number, Newtonian heating, Navier slip parameter, Frank-Kamenetskii parameter, and mixed convection parameter. Shear stress and heat transfer rates were also investigated and reported. The steady-state and unsteady-state solutions are visually expressed in terms of velocity and temperature profiles. Due to the presence of opposing force factors such as the Lorentz force, the research found that the Hartmann number reduces the momentum profile. Fluid temperature and velocity increase as the thermal Biot number and Frank-Kamenetskii parameter increase. There are several scientific and infrastructure capabilities that use this type of flow, such flow including solar communication systems exposed to airflow, electronic devices cooled at room temperature by airflow, nuclear units maintained during unscheduled shutoffs, and cooling systems occurring in low circumstances. The current findings and the literature are very consistent, which recommend the application of the current study.

Effect of reduced geometric dimensions on torque generation in two plate rotor magnetorheological brake with in-house magnetorheological fluid

The present study is aimed to evaluate the torque generation capacity of a two plate rotor magnetorheological (MR) brake using in-house prepared MR fluid. The prepared MR fluids were studied for sedimentation rate at different temperatures and flow characterization at different currents and at specific temperatures. The yield stress of the fluid is explored through Herschel–Bulkley model. The results depict significant increase in sedimentation rate and decrease in yield stress with increase in temperature of the MR fluid. MR brake (model-1) is fabricated after finite element method magnetics exhibit magnetic field of approximately 0.145 T in the shear gap than other two models (model-2 and model-3) considered in this study. Characterization of the MR brake illustrates that there is an increase in torque with increasing current. Further tests have been carried out to identify the effect of sedimentation on torque generation at 52 °C after 15 h of sedimentation. The results indicate 16% reduction in the initial torque because of settling of particles. MR fluid and particles characterization illustrates that 322 °C and 400 °C are critical points in controlling the MR fluid input parameters.

Free Convection Caputo-Fabrizio Casson Blood Flow in the Cylinder with Slip Velocity

Recently, fluid with fractional-order derivative model attracted many researchers to further study compared with the classical fluid mode since it is more precise and realistic. To imitate the applications of blood flow in narrow arteries, researchers focused on the fractional Casson fluid flow in the cylinder. However, most researchers solved the problems numerically and without considering the slip effect at the boundary. Thus, obtaining solutions analytically to the unsteady fractional Casson fluid flow in the slip cylinder with free convection is the goal of this study. The Caputo-Fabrizio fractional derivative approach is utilized to model this problem. By joining the approach of the Laplace transform and finite Hankel transform, the fractional governing equations are solved, and analytical solutions to the velocity and temperature profiles are gained. The fluid velocity rises as the slip velocity and Grashof number increase and it declines with the increment of the Casson parameter and Prandtl number. Increasing the fractional parameter will result in an increase in fluid velocity and temperature for a large time interval. The slip velocity effect influenced fluid flow, especially at the cylinder’s wall. These findings are beneficial to explore the more fractional-order derivative model and for studying the problems in biomedical engineering.

Experimental investigation of heat transfer characteristics of water in a vertically–upward tube under ultra-supercritical pressure and ultrahigh-temperature conditions

Advanced ultra-supercritical (A-USC) steam power generation technology is characterized by main steam conditions of > 700 °C and > 35 MPa, enhanced cycle efficiency, and reduced environmental footprint, and is one of the important development goals of the thermal power plants today. However, scarce studies were conducted on the heat transfer characteristics of supercritical water (SCW) under A-USC operating conditions. An experimental platform to safely measure the heat transfer of SCW flowing in a vertical tube at temperature up to 760 °C and pressure up to 42 MPa was designed and built in this study. Experimental measurements of the heat transfer characteristics of SCW were performed on this platform in a wide range of temperature and pressure, up to a maximum bulk fluid temperature of 750 °C and a maximum pressure of 38 MPa. The effects of pressure, mass flux, and heat flux on the heat transfer characteristics of SCW in the ultrahigh enthalpy region (over 3200 kJ·kg−1) were then analyzed based on the experimental data. Results show that in the ultrahigh enthalpy region, the bulk fluid temperature and wall temperature increase approximately linearly with increasing bulk fluid enthalpy. The heat transfer coefficient decreases gently and then gradually stabilizes in the same range, with values in the range of 4–10 kW·m−2·K−1. In the ultrahigh enthalpy region, increasing the mass flux or decreasing the heat flux will improve the heat transfer performance. And at a pressure of > 35 MPa, increasing the pressure will improve the heat transfer performance moderately. By comparing with experimental data, the Gupta’s correlation has acceptable accuracy in predicting the heat transfer coefficient and inner wall temperature.

Ramping Wall Boundary Analysis of Buoyant-Driven Convection Magnetohydrodynamics (MHD) Flow of B–H2O and Al2O3–H2O Nanofluid Past Vertical Edge in a Porous Zone

An analysis is explored to study ramping wall velocity, temperature and concentration as well as isothermal case of a nanofluid flow, suspended boron and aluminium oxide nanoparticles in the seawater at 20°celcius influenced by magnetic and gravitational forces in a semi-infinite flow region using integral transform method. Thermal radiation and heat injection/suction are also investigated. Rosseland’s approximation is used for radiative heat flow in the energy equation, whereas Bousinessq’s approach is used in the momentum equation. Fluid temperature, species concentration, and transport are solved using Heaviside, exponential and complementary error functions; friction drag, heat and mass transfer rates are solved using Gaussian error functions. Temperature, transport and species concentration are graphically exhibited while the numerical calculations have been carried out for friction drag, rate of heat transmission and Sherwood number are performed for both the ramped wall and isothermal cases, and the effects of emerging parameters are tabulated and discussed. Higher radiation parameters lead to an increase in fluid temperature. The velocity boundary layer is lowered by the magnetic field and porous media parameters. The Nusselt number drops as Prandtl number, radiation parameter and volume fraction grows for both ramping and isothermal situations, whereas increases when time and heat source parameter increases.

Effect of heat flux, viscosity, and Lorentz force for the micropolar fluid flow through a stretching vertical surface

The report on the micropolar fluid is useful in diversified areas, i.e. the flow of blood in the artery, colloidal suspension, paint, polymers, etc. The study is vital because of its exciting research and applications in different industries and science and engineering. Insight into the physical phenomena, the present article explores the character of heat flux considering the Cattaneo-Christov model on the flow of polar fluid past an expanding surface. Additionally, the conjunction of radiative hat vis-à-vis hat source enriches the thermal properties of a polar fluid. The constructive model is formulated and transformed to its non-dimensional form by the implementation of the similarity rules, and then these designed problem is handled numerically due to their complex nature. Various profiles have been studied to use diversified values of the pertinent parameters within their specified range. However, the computational results presented are well buttressed with the literature available. Moreover, the major outcomes of the results are; that the fluid velocity enhances the augmentation in the material as well as the buoyancy parameter and the inclusion of the radiative heat along with heat flux conditions favorable for the increasing fluid temperature.

Entropy Analysis of EMHD Hybrid Nanofluid Stagnation Point Flow over a Porous Stretching Sheet with Melting Heat Transfer in the Presence of Thermal Radiation

In this study, the entropy formation of an electromagnetohydrodynamic hybrid nanofluid at a stagnation point flow towards a stretched surface in the presence of melting heat transfer, second-order slip, porous medium, viscous dissipation and thermal radiation are investigated. Hybrid nanoparticles alumina (Al2O3) and copper (Cu) are considered, with the base fluid water (H2O). Similarity transformations are used to address the governing partial differential equations (PDEs) that lead to the corresponding ordinary differential equations. The resulting ODEs are solved by employing bvp4c solver numerically in the MATLAB package. The effects of temperature, transport, production of entropy and Bejan number Be are graphically exhibited. Higher radiation parameters R and an electric field E lead to an increase in fluid temperature. The velocity boundary layer is lowered by the magnetic field and porous media parameters. The opposite behaviour is observed in the electric field E. As a result, hybrid nanofluid has numerous uses in engineering cosmetics, automotive industry, home industry, for cancer treatment, food packaging, pharmaceuticals, fabrics, paper plastics, paints, ceramics, food colorants, electronics, heat exchangers, water purification, lubricants and soaps as well.

The equilibrium contact angle of ammonia-stainless steel interface

The knowledge of the wettability at the interface of different liquids and solid surfaces must be replenished in steps with material science. Wettability is a critical property in technologies where the interaction of fluid and solid substances is part of the working processes. This paper provides a brief experimental study dealing with the equilibrium contact angle identification at the interface of ammonia and stainless steel plates (SS316L) at different temperatures. The method with the capillary rise at the vertical plate has been exploited and validated with the available water/SS316L test data. The contact angles in the range 10° … 27° have been identified for the temperature range [-11 … 75] 0C with the apparent justification of wettability improvement with an increase in fluid temperature.

Numerical Exploration of Soret and Dufour Effect on Unsteady Free Convective Radiating Nanofluid Past a Vertical Moving Porous Plate

The present paper deals with the numerical investigation of Soret and Dufour effect on free convective heat and mass transfer characteristics of radiating water based nanofluid past a vertically moving porous plate in porous medium. The water based nanofluid with copper as a nanoparticle is considered in the present study. The dimensional governing equations relevant to the present model are transformed into non-dimensional form by using the appropriate parameters. The non-dimensional governing equations with the pertinent boundary conditions are solved numerically by using bvp4c function in Matlab software. The influence of suitable parameters on fluid velocity, temperature, concentration, Sherwood number (rate of mass transfer), Nusselt number (rate of heat transfer) and skin friction are exhibited graphically and discussed. Also, the effect of radiation parameter and Prandtl number in the absence of Dufour number has been compared with the help of contours. It is apparent from this study that fluid velocity increases with the increase in K, , & Du and decreases with increase in The fluid temperature increases with the increase in Du & R while it decreases with Pr. The fluid concentration increases with increase in whereas it decreases with . The rate of mass transfer (Sherwood number) increases with increase in Du and decreases with increase in & while the rate of heat transfer (Nusselt number) increases with increase in Du & Pr and decreases with increase in R. Shear stress (skin friction) decreases with the increase in , , K & Du.

Experimental and numerical study on the heat transfer characteristic of supercritical water with high mass velocity in a helically coiled tube

To explore the flow and heat transfer characteristics of supercritical fluid with high mass velocity in a helically coiled tube, experiments and numerical simulations were conducted to evaluate the wall temperature distribution and heat transfer coefficient in a vertical helically coiled tube under a pressure of 24–28 MPa, with a mass velocity of 2500–4000 kg·m−2·s−1 and with a heat flux of 210–420 kW·m−2. Results show that the coil's inner wall temperature is the highest and the outer wall temperature is the lowest because the centrifugal effect is much stronger than the buoyancy effect at a high mass velocity in a helically coiled tube and thus the fluid with lower temperature and consequently higher density shifts to the outer side of the coil. To describe the wall temperature difference in the different circumferential points, a metric called the circumferential wall temperature inhomogeneity (CWTI) is proposed, and the influence of the parameters on the CWTI is then analysed. As bulk fluid temperature increases, the CWTI first decreases to a minimum at the pseudo-critical temperature and then increases thereafter. The increase of mass velocity reduces the CWTI, and the influence of mass velocity on the CWTI is the most significant in the high enthalpy region. In the high enthalpy region with the bulk fluid temperature of 410.1 °C, when the mass velocity increases from 2500 to 3250 kg·m−2·s−1, the CWTI decreases by 34.2%. The CWTI also increases almost linearly with the increase in heat flux. Finally, the factors influencing the average heat transfer coefficient in the helical tube are discussed. The coefficient first increases and then decreases with increase in the bulk fluid temperature, and the peak value of the coefficient appears at the pseudo-critical point corresponding to the supercritical pressure. Increasing the mass velocity improves the average heat transfer coefficient, and the improvement effect is more obvious after the pseudo-critical point. Increasing the pressure causes the bulk fluid temperature at which the peak average heat transfer coefficient is achieved to increase, and the peak value gradually decreases. When the pressure increases from 24.0 MPa to 26.0 MPa and to 28.0 MPa, the peak value of the average heat transfer coefficient decreases by 34.2% and 46.4%, respectively.

Flat-plate solar collector thermal performance assessment via energy, exergy and irreversibility analysis

This paper presents a detail exergy analysis of a flat-plate solar collector based on irreversibility rates. The governing equations of the flat-plate collector are obtained by writing energy and exergy conservation equations for glass cover, absorber plate and working fluid. The computed results of this study are in concordance with previous studies experimental data. Our findings reveal that 84.97% of total collector irreversibility are linked to the absorber plate. Increasing the flow rate to 0.0056 kg/s decreases the irreversibility rate in the absorber plate to a minimum of 579.20 W and increases the irreversibility rate in the working fluid to it maximum of 158.83 W. The maximum exergy efficiency was 33.21% for a flow rate of 0.0056 kg/s and inlet fluid temperature of 30 °C. An increase in inlet fluid temperature from 20 to 65 °C decreases the absorber plate irreversibility by 129.13 W, meanwhile the working fluid and glass cover irreversibility increase by 30.37 W and 99.39 W, respectively. An increase in number of absorber tube from one to sixteen increases the energy and exergy efficiencies respectively by 34.61% and 92.94%. Meanwhile the absorber plate irreversibility rate increases by 97.49% and the irreversibility rates of the working fluid and glass cover reduce by 72.06% and 89.01%, respectively.

Joule heating effect on radiating MHD mixed convection stagnation point flow along vertical stretching sheet embedded in a permeable medium and heat generation/absorption

AbstractThe goal of this study is to investigate magnetohydrodynamics varied convective stagnation point stream with a vertically extended sheet embedded in a permeable material. Warmth generation/absorption, radiation impacts, and viscous dissipation are all considered. Using the process of likeness change, the principal boundary layer equations are written and turned into nonlinear ordinary joined differential equations, and the numerical result is produced using the Runge–Kutta fourth‐order approach via shooting technique. Varied physical limits have different effects, such as velocity fraction restriction, mixed convection restriction, Hartmann numeral, Prandtl numeral, permeability restriction, warm air radiation restriction, hotness generation/absorption restriction, and so on, over velocity and temperature scatterings are introduced graphically and then mathematically. The skin friction constant, in addition to Nusselt numerals, over the sheet is determined, expressed mathematically as well as introduced through tables. Fluid velocity and temperature increase with radiation restriction Ra. Skin friction and Nusselt numeral are increasing functions of Hartmann numeral Ha, and decreasing ones of permeability restriction K.

Rotating convective MHD flow over a vertical moving plate in the presence of heat source, radiation, chemical reaction and Hall effects

The steady MHD rotating flow and heat mass transfer over a semi-infinite vertical plate moving with a constant velocity in the presence of a heat source, thermal radiation, first-order chemical reaction and Hall effect are studied. The methodology proposed to predict the velocity, temperature and concentration evolutions is based on similarity transformation and finite difference method. The simulation has been carried out for different pertinent parameters of problem. The main results are that the velocity fields are considerably affected by the velocity ratio and coriolis parameters. Except the axial w-velocity that increases only near the plate with the velocity ratio parameter, all the velocities decrease as the velocity ratio and Coriolis parameters increase, whereas the temperature and the concentration profiles increase. Also, the fluid velocity and temperature increase when the heat source and radiation parameters increase but the concentration decreases.

Evaluation of outflow temperatures generated by a dry heat fluid warmer at low fluid rates

ObjectiveTo evaluate the output temperature of a dry heat fluid warmer at fluid rates typically used in small animal veterinary patients. Study designProspective in vitro study. AnimalsNone. MethodsAmbient temperature lactated Ringer’s (17.9-18.8 °C) was delivered via a dry heat fluid warmer. A temperature probe was used to measure fluid outflow temperature from the compatible giving set at 5, 10, 20, 50, 70, 80, 100, 200, 300, 400 and 500 mL hour–1. Outflow fluid temperature at plateau (two consecutive readings within 0.1 °C) was compared with baseline fluid temperature (fluid warmer turned off) to calculate temperature changes at each rate. Kruskal–Wallis test was used to compare changes in temperature and time to plateau temperature. Dunn’s post hoc test was used to test for significant differences in temperature compared to 5 mL hour–1; p value < 0.05. ResultsMedian plateau outflow temperature increased as fluid rate increased, with temperatures of 18.5, 18.6, 18.7, 18.8, 19.4, 19.4, 21.5, 25.3, 28.5, 30.7 and 32.6 °C, at flow rates of 5, 10, 20, 50, 70, 80, 100, 200, 300, 400 and 500 mL hour–1. Fluid rates > 100 mL hour–1 showed significant increases from baseline (p = 0.021) There was no difference in temperature change from baseline at fluid rates < 100 mL hour–1 (p > 0.05). Compared to plateau temperature at 5 mL hour-1, there was a statistical difference in plateau temperature above 100 mL hour–1(p = 0.0207). Maximum outflow plateau temperature was 32.6 °C at 500 mL hour–1. Conclusions and clinical relevanceA dry heat fluid warmer has significantly decreased efficacy at low fluid rates, with no statistically significant increase in fluid temperature at fluid rates below 100 mL hour–1 at the end of a compatible fluid line. Inline dry heat fluid warmers are ineffective at fluid rates below 100 mL hour–1.

Numerical analysis of hydromagnetic mixed convective flow in an internally heated vertical porous layer using thermal nonequilibrium model

AbstractThe inertial and viscous effects on mixed hydromagnetic convection in a vertical porous channel using a local thermal nonequilibrium model with uniformly distributed internal sources are analyzed. The flow in the porous medium is described by the Brinkman–Forchheimer extension of Darcy's momentum equation. The vertical rigid boundaries are maintained at constant but different temperatures and a uniform magnetic field is applied across the porous layer. The governing equations are solved numerically by the finite element method and analytically by the perturbation method. The influence of governing parameters on the flow variables and heat transfer is discussed. An extensive study designates that an increase in the Darcy number enhances the velocity distribution due to increased permeability of the medium while the opposite trend is observed with increasing Hartmann number due to the increased retarding nature of Lorentz force. The presence of an external heat source has a notable impact on the temperature gradient of the fluid, which results in an increase in temperature distribution and thermal state of the fluid. A quantitative increase in heat transfer coefficient results in an increase of fluid temperature toward the electrically nonconducting wall, and as the fluid moves toward the electrically conducting wall the fluid temperature decreases. The results indicate that the Nusselt number declines with an increase in the solid internal heat generation parameter.

Study on mechanism of improving efficiency of permanent-magnet small ball-end magnetorheological polishing by increasing magnetorheological fluid temperature

Permanent-magnet small ball-end magnetorheological polishing method can be used to polish the small part with complex structure. However, the material removal rate of this method is low, which is difficult to improve the output and reduce the cost. In this research, the effect of magnetorheological fluid temperature on the material removal rate is theoretically analyzed by measuring the effect of temperature on the flow properties of magnetorheological fluid, establishing the hydrodynamic model of polishing zone and solving the material removal parameters. It is found that with the increase of the magnetorheological fluid temperature, the polishing relative velocity increases accordingly, which can promote the improvement of material removal rate. But the shear stress decreases accordingly, which inhibits the improvement of material removal rate. The verification experiment results show that the promoting effect can exceeds the inhibitory effect, so that the material removal rate increases with the increase of magnetorheological fluid temperature. When the magnetorheological fluid temperature increases to 60 °C, the material removal rate is improved by 108.4% and the polished surface roughness Sa can reach 14.9 nm. Therefore, increasing the magnetorheological fluid temperature can significantly improve the efficiency of permanent-magnet small ball-end magnetorheological polishing and obtain high quality polished surface.

Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea

The process of drilling in natural gas hydrate reservoirs in sea areas involves problems such as hydrate decomposition and wellbore instability. To study the response behaviors of a reservoir during the drilling process, a two-dimensional numerical model of drilling fluid invading a hydrate reservoir in a cylindrical coordinate system was established to simulate the processes of heat and mass transfer, gas–liquid two-phase flow, and hydrate formation and decomposition in the hydrate reservoir during the drilling process. Based on the hydrate reservoir at station W17, Shenhu area of the South China Sea, the physical property response of the hydrate reservoir under different drilling fluid temperatures and salinity values was studied. The simulation results showed that during the drilling process, the temperature and pressure of the reservoir respond rapidly in a large area, further promoting the hydrate decomposition in the reservoir around the wellbore and leading to secondary hydrate formation. Moreover, a high hydrate saturation zone appears near the decomposed hydrate area in the layer without free gas, which corresponds to the low water saturation and high salinity zone. The hydrate decomposition area in the layer with free gas is larger than that without free gas. The increase in the drilling fluid temperature significantly enhances the hydrate decomposition in both layers of the reservoir. The hydrate decomposition near the wellbore under the high drilling fluid temperature will cause a sharp increase in the pressure in the reservoir, leading to the flow of pore fluid into the wellbore. The increase in drilling fluid salinity has little effect on the range of the hydrate decomposition in the reservoir but significantly increases the salinity of the pore water in the layer with free gas. As the drilling fluid temperature increases, the possibility of the gas invasion from the reservoir into the wellbore will be greatly increased at the early stage.