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首页> 外文期刊>Journal of porous media >EFFECTS OF INTERNAL HEAT GENERATION OR ABSORPTION ON HEAT TRANSFER AND FLUID FLOW WITHIN PARTIALLY HEATED SQUARE ENCLOSURE: HOMOGENEOUS FLUIDS AND POROUS MEDIA
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EFFECTS OF INTERNAL HEAT GENERATION OR ABSORPTION ON HEAT TRANSFER AND FLUID FLOW WITHIN PARTIALLY HEATED SQUARE ENCLOSURE: HOMOGENEOUS FLUIDS AND POROUS MEDIA

机译：内部加热或吸收对部分加热的方形外壳内传热和流体流动的影响：均质流体和多孔介质

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摘要

The effects of internal heat generation or absorption on heat transfer and fluid flow within a partially heated square cavity for both homogeneous medium and porous medium are investigated in the current study. The Darcy-Brinkman and the energy transport equations are used to predict the heat transfer process in the porous medium when it is generated by heating at the bottom walls of the cavity. Numerical results are presented and analyzed in terms of fluid flow, thermal field structures, as well as average Nusselt number profiles over a wide range of dimensionless quantities [internal Rayleigh number (Ra-I) varied between -10(6) and 10(6), heat source length, porosity coefficient values, and Darcy number in the range 10(-5) to 10(-2)]. The effect of heat generation and absorption in the homogenous medium and porous medium is also discussed. It was seen that an optimal heat transfer rate is obtained for both high internal Rayleigh number and high porosity coefficient (epsilon = 0.8 and Ra-I = 10(6)), whereas a lower thermal rate was found in the first computations for (epsilon = 0.4 and Ra-I = 10(5)). The correlations of heat transfer rates in both homogenous and porous medium cases are established in the current investigation.
机译：在当前研究中，研究了内部热量的产生或吸收对均热介质和多孔介质在部分加热的方腔内传热和流体流动的影响。达西-布林克曼（Darcy-Brinkman）和能量传输方程式用于预测多孔介质中的热传递过程，该过程是通过在腔体底壁加热产生的。呈现并分析了数值结果，包括流体流动，热场结构以及各种无因次量的平均努塞尔数分布图[内部瑞利数（Ra-1）在-10（6）和10（6之间变化） ），热源长度，孔隙率系数值和达西数在10（-5）到10（-2）之间]。还讨论了均质介质和多孔介质中热量的产生和吸收的影响。可以看出，对于高内部瑞利数和高孔隙率系数（epsilon = 0.8和Ra-I = 10（6））都可以获得最佳的传热速率，而在（epsilon = 0.4且Ra-I = 10（5））。在当前的研究中，均热和多孔介质情况下的传热速率之间的关系已经建立。

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