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首页> 外文期刊>International Journal of Heat and Mass Transfer >Entransy flux of thermal radiation and its application to enclosures with opaque surfaces
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Entransy flux of thermal radiation and its application to enclosures with opaque surfaces

机译：辐射的热传递通量及其在具有不透明表面的外壳中的应用

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摘要

Entransy is a new concept developed in recent years to measure the transport ability of heat at a temperature in conduction and convection. This paper develops the concept of entransy flux for thermal radiation in enclosures with opaque surfaces. The entransy balance equation and entransy dissipation function are derived. The minimum principle of radiative entransy loss is developed. The potentials and the heat fluxes distribution which meet the Stefan-Boltzmann's law and the energy balance equation would make the radiative entransy loss minimum if the net heat flux of each surface or the thermal potentials of the surfaces are given. The extremum entransy dissipation principles (EEDP) for thermal radiation are developed. The minimum radiative entransy dissipation leads to the minimum average radiative thermal potential difference for prescribed total heat exchange and the maximum radiative entransy dissipation leads to the maximum heat exchange for prescribed average radiative thermal potential difference. The minimum and maximum principle can be concluded into the minimum thermal resistance principle (MTRP) for thermal radiation by defining the thermal resistance with the entransy dissipation. The EEDP or MTRP is proved to be reliable when they are used to optimize some radiative heat transfer problems, and a comparison is made between the minimum principle of entropy generation and the EEDP.
机译：Entransy是近年来发展起来的一种新概念，用于测量热在传导和对流中的传输能力。本文提出了具有不透明表面的外壳中用于热辐射的瞬态通量的概念。导出了熵平衡方程和熵耗散函数。发展了辐射传输损失的最小原理。如果给出每个表面的净热通量或表面的热势，则满足Stefan-Boltzmann定律和能量平衡方程的势和热通量分布将使辐射传递损失最小。提出了用于热辐射的极值瞬态耗散原理（EEDP）。对于规定的总热交换，最小的辐射熵耗散导致最小的平均辐射热势差，而对于规定的平均辐射热势差，最大的辐射熵耗散导致最大的热交换。最小和最大原理可以通过定义热阻随同耗散定义为热辐射的最小热阻原理（MTRP）。 EEDP或MTRP在用于优化某些辐射传热问题时被证明是可靠的，并且在熵的最小原理和EEDP之间进行了比较。

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