Thermal dispersion effects on heat transfer of laminar gas flow in a microtube filled with porous medium

Shokouhmand, Hossein; Bagherzade, Pooya; Fazli, Mohammad; Shomali, Ali

doi:10.1016/j.ijthermalsci.2017.09.002

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…In addition, a large number of studies are aimed at studying the hydrodynamic characteristics of porous media and study of heat and mass transfer processes occurring in them, as for example, in [3][4][5][6][7][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effective Thermal Conductivity of Structured Porous Medium: Numerical Study

Popov

Bragin

Еремин

2022

DDF

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The paper presents a numerical study of thermal conductivity of porous structures using the Ansys software package. Unlike the well-known porous materials used in construction and engineering, it is proposed to use porous materials with an ordered law of cavity placement. The porous material proposed is formed by dividing the volume into cubes of equal size with a spherical cavity placed in the center of each cube. The numerical calculation of an effective thermal conductivity coefficient of a porous medium is performed using the Ansys Mechanical computer modeling tool. The values obtained are compared with solutions based on classical methods for determining the effective thermal conductivity of porous materials. A dependency graph of effective thermal conductivity in a porous material based on pores geometric parameters (distance between cavities, diameter of cavities), as well as an analytical dependence to obtain the effective thermal conductivity value is presented. Additive technologies available today provide producing the proposed porous material with an ordered law of cavity placement with any accuracy and any pore geometric parameters. Such materials open up wide opportunities for engineers, especially in the field of thermal power engineering, because it has predictable thermophysical and mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Effective Thermal Conductivity of Structured Porous Medium: Numerical Study

Popov

Bragin

Еремин

2022

DDF

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“…Bigham et al have numerically investigated the combined effects of rarefaction, creeping flow and viscous dissipation on hydrodynamic and thermal characteristics of a symmetric constricted microchannel. Shokouhmand et al have studied the effect of thermal dispersion in a microtube filled with porous medium. They observed the variation of Nusselt number with some physical parameters and demonstrated that in each Knudsen number, thermal dispersion enhances the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Prediction of flow and heat transfer through a microtube filled with bidisperse porous medium under local thermal nonequilibrium condition

et al. 2020

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In this paper, the thermal and hydrodynamic solutions of a microtube filled with bidisperse porous medium (BDPM) under the local thermal nonequilibrium (LTNE) condition are presented. Considering the LTNE condition, the energy equations have been numerically solved. The rarefaction effects are considered for Knudsen numbers ranging from 0 to 0.1; therefore, first-order boundary condition is applied on the wall. The temperature distribution of each phase is examined with respect to the involved parameters in the BDPM system. For the first time, the Nusselt number ratio (NRDP) is introduced to study the influence of Darcy number on the Nusselt number more precisely. Also, the effect of different thermophysical parameters on the Nusselt number is studied. The advantage of BDPM system over monodisperse porous medium (MDPM) structure is examined through the heat transfer performance parameter. The findings exhibit a good agreement with the literature. Also, the LTNE condition produces more realistic results in comparison to local thermal equilibrium assumption. On the whole, although implementing the BDPM enhances the heat transfer rate compared with the MDPM, it does not improve the thermal hydrodynamic performance significantly. K E Y W O R D S bidisperse porous medium, forced convective heat transfer, local thermal nonequilibrium, microtube, rarefaction effect

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