Influence of fin parameters on the convection radiation coupled heat transfer characteristics in enclosed cavity with internal heat source based on response surface analysis

DOI:	10.11809/bqzbgcxb2024.02.015
Keywords:	enclosed cavity; convection radiation coupled heat transfer; multi parameter optimization; response surface method; numerical simulation
Abstract:	In order to study the influence of built in fin parameters on the natural convection radiation coupled heat transfer in enclosed cavity with heat source, a comparative numerical analysis of the heat transfer capacity in the cavity under different fin parameters was carried out on the basis of whether the radiation effect of inner wall surface was considered.The influence of multi parameter interaction of fin on convection radiation coupled heat transfer effect in cavity was analyzed by response surface method. The results show that wall radiation of certain intensity is beneficial to improve the convective heat transfer effect of heat source and cold wall surface. Wall radiation enhances the fluctuation degree of local Nusselt number on the cold wall near the fin.The maximum value of the average Nusselt number on the cold wall increases by 16.74% compared with the non fin condition.Regardless of whether the radiation is considered, the fin length l has the most significant effect on the average Nusselt number on the heat source surface. The optimal fin single parameters are θ=120°, l=0.02H, a=0.75H, respectively.When radiation was considered, the corresponding increase rates of the average Nusselt number on the heat source surface are 10.15%, 11.03%, 10.48%, respectively, because η is higher; The analysis of response surface optimization shows that the interaction between fin length and installation height has the most significant effect on the average Nusselt number of heat source surface, the fin parameters combination with the highest convection radiation coupled heat transfer efficiency in cavity is θ=117.94°, l=0.023H, a=0.734H, the average Nusselt number of the heat source surface is 26.50, which is 1315% higher than the non fin condition. The influence laws of fin parameters and the multi objective optimization results reflect the significance of the interaction of various factors, and also provide theoretical guidance for improving the convective cooling effect of heating elements in the closed space of industrial devices.
Published:	2024-02-28
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