Multi-objective constructal design for quadrilateral heat generation body based on thermal-entransy theory and NSGA-Ⅱ  

作　　者：CHEN LinGen ZHU HongWei GE YanLin SHI ShuangShuang FENG HuiJun 

机构地区：[1]Institute of Thermal Science and Power Engineering,Wuhan Institute of Technology,Wuhan 430205,China [2]Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment,Wuhan 430205,China [3]School of Mechanical,Electrical Engineering,Wuhan Institute of Technology,Wuhan 430205,China

出　　处：《Science China(Technological Sciences)》2024年第9期2777-2786,共10页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.52171317)。

摘　　要：Based on thermal-entransy theory, the multi-objective constructal design of quadrilateral heat generation body(HGB) with similar shapes of leaves is studied further. The relationship between the aspect ratio of quadrilateral HGB and average temperature difference based on thermal-entransy dissipation is compared with that between the aspect ratio of quadrilateral HGB and the maximum temperature difference(MTD). The relationship between a composite function, consisting of linear weighting sum of the average temperature difference and MTD, and aspect ratio is obtained, and the optimal aspect ratios under minimum composite function with different weighting coefficients are obtained. Using the NSGA-Ⅱ algorithm, the Pareto frontier containing a series of compromise results of average temperature difference and MTD is obtained, and optimization results are compared using the deviation index. There is no aspect ratio to make both MTD and average temperature difference reach the minimum, and the optimal aspect ratio under the minimum MTD is smaller than that under the minimum average temperature difference. The optimal aspect ratio is obtained by making the composite function reach the minimum, and the optimal aspect ratios obtained by minimizing the composite function with different weighting coefficients are different. Compared with the construct of the initial design, the value of the composite function with optimal construct decreases by 1.9%, and the aspect ratio of the quadrilateral HGB decreases by 9.1%. The average temperature difference with the optimal construct increases by 2.1%, and the MTD with the optimal construct decreases by 5.6%. The deviation index under multi-objective optimization is smaller than that under single-objective optimization, and the obtained construct has better comprehensive thermal conductivity. Compared with TOPSIS and LINMAP decision-making methods, the average temperature difference with composite function optimization increases by 0.55% and 0.62% respectively, but the MTD with co

关 键 词：thermal-entransy theory constructal theory heat conduction quadrilateral heat generation body composite function NSGA-Ⅱ 

分 类 号：TK124[动力工程及工程热物理—工程热物理]