Effect Of A Sinusoidal Temperature Profile On Entropy Generation Due To Double-Diffusive Natural Convection In A Square Partly Porous Cavity

IF 2.8 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-06-29 DOI:10.1115/1.4062856

Omara Abdeslam, Bourouis Abderrahim, Rabah Bouchair

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Abstract

In this manuscript, entropy generation due double-diffusive natural convection and sinusoidal heating on one side inside a composite enclosure is numerically analyzed for various values of some governing parameters. Finite Volume method (FVM) is used to discretize the resulting dimensionless coupled partial differential equations while the SIMPLE algorithm is used to deal with pressure-velocity coupling. The validity of the results obtained by the in-house FORTRAN code is verified by comparison with previous numerical and experimental work. It was found that in the case of comparable effects of temperature and concentration buoyancy forces (N=1), the heat transfer irreversibility increases with increasing α and becomes dominant for α=0.8, resulting in a values of average Bejan number, Beavg>0.5, while at high values of N (N=10), the fluid friction irreversibility dominates for all values of ?. Moreover, the results indicate that for the chosen values of Ra and Da, the entropy generation due to fluid friction is dominant when (Sψ)<1 (partly porous cavity), regardless of Rk, a and N values, whereas for pure porous cavity (Δ=1), Sθ(max) becomes dominant.

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正弦温度分布对方形部分多孔腔中双扩散自然对流产生熵的影响

本文对复合材料外壳内双扩散自然对流和单侧正弦加热的熵产进行了数值分析。采用有限体积法(FVM)对得到的无量纲耦合偏微分方程进行离散化，采用SIMPLE算法处理压力-速度耦合。通过与以往数值和实验工作的对比，验证了自制FORTRAN代码计算结果的有效性。结果表明，在温度和浓度浮力作用比较的情况下(N=1)，传热不可逆性随α的增大而增大，并在α=0.8时占主导地位，平均贝让数为Beavg>0.5，而在高N值(N=10)时，流体摩擦不可逆性在所有值均占主导地位。结果表明，对于Ra和Da的选取值，无论Rk、a和N值如何，当(Sψ)<1(部分多孔腔)时，流体摩擦产生的熵占主导地位，而对于纯多孔腔(Δ=1)， Sθ(max)占主导地位。

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来源期刊

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.