Second law analysis of coupled conduction-radiation heat transfer with phase change

作者：Makhanlall, D.; Liu, L. H.^*

来源：Gynecologie Obstetrique Fertilite & Senologie, 2021, 49(9): 1829-1836.

DOI：10.1016/j.ijthermalsci.2010.04.026

• Entropy production
• Exergy loss
• Phase change
• Coupled conduction-radiation heat transfer
• Second law analysis

This work considers an exergy-based analysis of two-dimensional solid-liquid phase change processes in a square cavity enclosure. The phase change material (PCM) concerns a semi-transparent absorbing, emitting and anisotropically scattering medium with constant thermodynamic properties. The enthalpy-based energy equation is solved numerically using computational fluid dynamics. Once the energy equation is solved, local exergy loss due to heat conduction and radiative heat transfer during the phase change process is calculated by post processing procedures. In this work, the radiation exergy loss in the medium and at the enclosure boundary is taken into consideration. It is found that radiation exergy loss is significant in the high-temperature phase change process. Parametric investigation is also carried out to study the effects of Stefan number, Biot number, Planck number, single scattering albedo and wall emissivity on exergy loss. The results show that the total exergy loss increases with Biot number, single scattering albedo and wall emissivity. The second law effects of the conduction-radiation coupling in the energy equation are also shown in this work.

• 出版日期2021-9
• 单位哈尔滨工业大学