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Constructal design of a rectangular porous fin considering minimization of maximum temperature difference and pumping power consumption

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Science China(Technological Sciences) 2024年第3期67卷 919-929页

作者： LIU XiaoYe feng huijun CHEN LinGen GE YanLin Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China College of Power Engineering Naval University of EngineeringWuhan 430033China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

A heat dissipation model of a rectangular porous fin is established based on constructal theory. First, the constructal design of rectangular porous fin is conducted by selecting a complex function minimization, which composed of linear weighting sum of maximum temperature difference and pumping power consumption, as optimization objective. Effects of gap height, air inlet velocity, total porous fin volume and porosity on the optimal constructs are investigated, respectively. The findings show that the complex function can attain its double minimum at a value of 0.802 when the fin length and number are optimized, and the corresponding optimal fin length and number are 8.01 mm and 10, respectively. In comparison to original design, the complex function and maximum temperature difference after twice optimization are decreased by 19.80% and 66.31%, ***, the comprehensive performance of porous fin is improved by simultaneously optimizing the fin length and number. The artificial neural network is applied to predict the fin performances, which is used to conduct multi-objective optimization based on NSGA-II algorithm. Optimal structure of porous fin for multiple requirements is gained by LINMAP and TOPSIS decisionmaking strategies. The findings in this study can serve as theoretical guides for fin thermal designs of electronic devices.

关键词： constructal theory rectangular porous fin pumping power consumption maximum temperature difference complex function multi-objective optimization

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Constructal design of a rectangular parallel phase change microchannel in a three-dimensional electronic device

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Science China(Technological Sciences) 2024年第5期67卷 1381-1390页

作者： ZHANG JiWen feng huijun CHEN LinGen GE YanLin Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan430205China College of Power Engineering Naval University of EngineeringWuhan430033China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan430205China

Based on constructal theory,a rectangular parallel phase change microchannel model in a three-dimensional electronic device(TDED)is established with R134a as the cooling *** on the minimization of a complex function(CF)composed of linear weighting sum of maximum temperature difference and pumping power consumption,constructal design of the TDED is conducted first;and then,maximum temperature difference and pumping power consumption are minimized by non-dominated sorting genetic algorithm-II *** results reveal that there exist an optimal mass flow rate(0.0012 kg/s)and a quadratic optimal aspect ratio(AR)(0.39)of the microchannel which lead to quadratic minimum CF(0.817).Compared with the original value,the CF after optimization is reduced by 18.34%.Reducing the inlet temperature of cooling fluid and microchannel number appropriately can help to enhance the overall performance of *** using the artificial neural network and genetic algorithms in the toolboxes of Matlab software,the optimal AR gained in the Pareto solution set is located between 0.2–*** smallest deviation index among three discussed strategies is 0.346,and the corresponding optimal AR is 0.413,which is selected as the optimal design strategy of the microchannel in the TDED under multiple *** findings in this study can serve as theoretical guides for thermal designs of electronic devices.

关键词： constructal theory parallel microchannel evaporation phase change three-dimensional electronic device multi-objective optimization artificial neural network

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Constructal design of printed circuit recuperator for S-CO_(2)cycle via multi-objective optimization algorithm

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Science China(Technological Sciences) 2024年第1期67卷 285-294页

作者： DAN ZhiSong feng huijun CHEN LinGen LIAO NaiBing GE YanLin Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China College of Power Engineering Naval University of EngineeringWuhan 430033China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China AECC Hunan Aviation Powerplant Research Institute Zhuzhou 412002China

Based on a constructal theory,the structure design of a printed circuit recuperator with a semicircular heat transfer channel for supercritical CO_(2)cycle is carried ***,a complex function composed of weighted sum of the reciprocal of total heat transfer rate and total pumping power consumption is regarded as an optimization objective,and total volumes of the recuperator and heat transfer channel are regarded as *** optimal heat transfer channel radius and minimum complex function of the recuperator are *** turns out that heat transfer rate,pumping power consumption,and complex function under the optimal construct of recuperator are reduced by 15.10%,82.44%,and 32.33%,*** exists the optimal single plate channel number which results in the double minimum complex ***,for the purpose of minimizing the reciprocal of heat transfer rate and pumping power consumption,NSGA-II algorithm is used to achieve multi-objective optimization,and the minimum deviation index derived by the decision-making methods is 0.076,which can be taken as multi-objective optimal design scheme for printed circuit recuperator with semicircular heat transfer *** findings presented here can serve as theoretical recommendations for the structure design of printed circuit recuperator.

关键词： constructal theory supercritical CO_(2)cycle printed circuit heat exchanger heat transfer rate pumping power consumption multi-objective optimization

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Energy and exergy analyses and optimizations for two-stage TEC driven by two-stage TEG with Thomson effect

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Science China(Technological Sciences) 2024年第4期67卷 1077-1093页

作者： CHEN LinGen GE YanLin feng huijun REN TingTing Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

Based on the non-equilibrium thermodynamics and energy and exergy analyses,a thermodynamic model of two-stage thermoelectric(TE)cooler(TTEC)driven by two-stage TE generator(TTEG)(TTEG-TTEC)combined TE device is established with involving Thomson effect by fitting method of variable physical parameters of TE *** total number of TE elements as constraint,influences of number distributions of TE elements on three device performance indictors,that is,cooling load,maximum COP and maximum exergetic efficiency,are *** number distributions of TE elements are optimized with three maximum performance indictors as the objectives,*** of hot-junction temperature of TTEG and coldjunction temperature of TTEC on optimization results are analyzed,and difference between optimization results corresponding to three performance indicators are *** performance intervals and optimal variable intervals are *** of Thomson effect on three general performance indicators,three optimal performance indicators and optimal variables are comparatively *** effect reduces three general performance indicators and three optimal performance indicators of *** hot-and cold-junction temperatures of TTEG and TTEC are 450,305,325 and 295 K,respectively,Thomson effect reduced maximum cooling load,maximum COP and maximum exergetic efficiency from 9.528 W,9.043×10^(-2)and2.552%to 6.651 W,6.286×10^(-2)and 1.752%,respectively.

关键词： non-equilibrium thermodynamics cooling load COP exergetic efficiency combined thermoelectric device performance optimization

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

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Science China Technological Sciences 2024年第9期67卷 2777-2786页

作者： CHEN LinGen ZHU HongWei GE YanLin SHI ShuangShuang feng huijun Institute of Thermal Science and Power Engineering Wuhan Institute of Technology Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment School of Mechanical & Electrical Engineering Wuhan Institute of Technology

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 0.5

关键词： thermal-entransy theory constructal theory heat conduction quadrilateral heat generation body composite function NSGA-II

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圆柱发热体内圆截面液冷通道的构形优化

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工程热物理学报 2024年第7期45卷 1908-1916页

作者：李云峰谢志辉陈林根冯辉君海军工程大学动力工程学院武汉430033 武汉工程大学热科学与动力工程研究所武汉430205 武汉工程大学机电工程学院武汉430205 湖北省绿色化工装备工程技术研究中心武汉430205

建立了一类在均匀产热的圆柱发热体中嵌入圆截面等温液冷通道的热源-热沉集成模型,基于构形理论,给定圆柱发热体截面积和通道截面积占比为约束条件,以液冷通道数及其半径为设计变量,研究了液冷通道分布对集成模型散热能力的影响,获得了... 详细信息

建立了一类在均匀产热的圆柱发热体中嵌入圆截面等温液冷通道的热源-热沉集成模型,基于构形理论,给定圆柱发热体截面积和通道截面积占比为约束条件,以液冷通道数及其半径为设计变量,研究了液冷通道分布对集成模型散热能力的影响,获得了不同液冷通道截面积占比下的最优构形。当通道截面积占比和通道数给定时,均存在最优的圆心距使得热源-热沉整体的散热性能最优,但对应两个指标的最优圆心距不同。给定通道截面积占比时,无量纲最高温度和无量纲当量热阻均随通道数的增加而降低;给定通道数时,无量纲最高温度和无量纲当量热阻均随通道截面积占比的增加而降低。本文所得研究结果可对圆柱器件高效冷却的热设计提供理论指导。

关键词：构形理论理论电子器件散热热设计广义热力学优化

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基于超声影像组学列线图预测T1期乳腺癌同侧腋窝淋巴结转移的价值

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中国医学影像学杂志 2024年第8期32卷 796-802,808页

作者：魏伟冯慧俊王晔韦天军何丽英张霞张伟江峰皖南医学院第一附属医院(弋矶山医院)超声医学科安徽芜湖241000 皖南医学院第一附属医院(弋矶山医院)病理科安徽芜湖241000

目的建立并验证基于超声影像组学的诺模图预测T1期乳腺癌同侧腋窝淋巴结转移的价值。资料与方法回顾性收集2012年1月—2021年6月皖南医学院第一附属医院(弋矶山医院)经病理证实的T1期乳腺癌443例,按7∶3随机分为训练组310例和验证组133... 详细信息

目的建立并验证基于超声影像组学的诺模图预测T1期乳腺癌同侧腋窝淋巴结转移的价值。资料与方法回顾性收集2012年1月—2021年6月皖南医学院第一附属医院(弋矶山医院)经病理证实的T1期乳腺癌443例,按7∶3随机分为训练组310例和验证组133例。使用ITK-SNAP勾画肿瘤边缘感兴趣区,利用Pyradiomics软件提取特征,筛选特征后构建影像组学模型及标签得分Rad-score。分别建立临床模型、影像组学模型及联合诊断模型,并构建联合模型的预测诺模图,采用受试者工作特征曲线评价各模型的预测价值。结果多因素分Logistic回归析显示,腋窝超声检查阳性、高回声晕及病灶内部血供丰富是预测腋窝淋巴结转移的独立危险因素,构建临床诊断模型。通过特征筛选构建影像组学模型。基于临床、影像组学特征构建联合诊断模型,训练组联合模型的曲线下面积为0.822,大于临床模型及影像组学模型的0.765、0.723(P=0.0021、0.0018);验证组中联合模型的曲线下面积大于影像组学模型(0.846比0.686,P=0.0018),与临床模型(0.783)差异无统计学意义(P=0.1113)。结论基于超声影像组学构建的联合诊断模型,能够有效预测T1期乳腺癌同侧腋窝淋巴结转移,具有很高的临床预测效能。

关键词：乳腺肿瘤超声检查淋巴转移影像组学列线图表预测

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Power and efficiency optimizations of Maisotsenko-Atkinson,Dual and Miller cycles and performance comparisons with corresponding traditional cycles

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Science China(Technological Sciences) 2023年第12期66卷 3393-3411页

作者： CHEN LinGen ZHU FuLi SHI ShuangShuang GE YanLin feng huijun Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China Fute Technology Hangzhou 310012China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

Maisotsenko cycle(M-cycle)has been combined with some cooling and power cycles,and behaves important thermodynamic ***-time thermodynamics(FTT)is applied to establish three endoreversible models of M-Atkinson,M-Dual and M-Miller *** are performed based on models of endoreversible Atkinson,Dual and Miller cycles by combing FTT model with M-cycle *** output(POW)and thermal efficiency(TEF)of those M-cycles are studied and optimized by numerical *** maximum power output(MPO)and the corresponding pressure ratio and TEF,the maximum TEF and the corresponding pressure ratio and POW,as well as optimal ranges of pressure ratio are *** of mass flow rate of circulating water injection,initial cycle temperature and maximum cycle temperature on cycle POW,TEF and optimal pressure ratio range are *** optimal performances of the three M-cycles are compared with those of traditional Atkinson,Dual and Miller cycles under the same *** results show that for the three M-cycles,end temperature of adiabatic expansion process of M-cycle is less than that of the corresponding traditional cycle,POW and TEF at arbitrary pressure ratio of M-cycle are much higher than those of the corresponding traditional cycle,and performance characteristics of M-cycles are superior to those of the corresponding traditional cycles.

关键词： Maisotsenko-Atkinson cycle Maisotsenko-Dual cycle Maisotsenko-Miller cycle power efficiency finite time thermodynamic optimization

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Power and efficiency optimizations for an open cycle two-shaft gas turbine power plant

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Propulsion and Power Research 2023年第4期12卷 457-466页

作者： Lingen Chen huijun feng Yanlin Ge Shuangshuang Shi Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

In finite-time thermodynamic analyses for various gas turbine cycles,there are two common models:one is closed-cycle model with thermal conductance optimization of heat exchangers,and another is open-cycle model with optimization of pressure drop(PD)*** of optimization also with searching optimal compressor pressure ratio(PR).This paper focuses on an open-cycle model.A two-shaft open-cycle gas turbine power plant(OCGTPP)is modeled in this *** of power output(PP)and thermal conversion efficiency(TCE)are deduced,and these performances are optimized by varying the relative PD and compressor *** results show that there exist the optimal values(0.32 and 14.0)of PD and PR which lead to double maximum dimensionless PP(1.75).There also exists an optimal value(0.38)of area allocation ratio which leads to maximum TCE(0.37).Moreover,the performances of three types of gas turbine cycles,such as one-shaft and two-shaft ones,are *** the relative pressure drop at the compressor inlet is small,the TCE of third cycle is the biggest one;when this pressure drop is large,the PP of second cycle is the biggest *** results herein can be applied to guide the preliminary designs of OCGTPPs.

关键词： Two-shaft gas turbine power plant Efficiency Power Area distribution Pressure drop Finite-time thermodynamics

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变温热源内可逆Braysson循环性能分析与优化

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热力透平 2024年第1期53卷 26-31,57页

作者：刘旭戈延林陈林根冯辉君武汉工程大学热科学与动力工程研究所武汉430205 武汉工程大学机电工程学院武汉430205 湖北省绿色化工装备工程技术研究中心武汉430205

用有限时间热力学理论建立了变温热源内可逆Braysson循环模型,导出了功率和效率的数学表达式,分析了循环参数对二者的影响,并通过优化热导率分配和热容率匹配来进一步优化循环功率和效率。结果表明:优化高、低温侧换热器热导率分配过程... 详细信息

用有限时间热力学理论建立了变温热源内可逆Braysson循环模型,导出了功率和效率的数学表达式,分析了循环参数对二者的影响,并通过优化热导率分配和热容率匹配来进一步优化循环功率和效率。结果表明:优化高、低温侧换热器热导率分配过程中,存在一个最佳工质对数温比,使得效率达到最大值;存在一组最佳热导率分配和最佳工质对数温比,使得功率和效率达到双重最大值;优化工质与热源间热容率匹配过程中,存在一组最佳热容率匹配、最佳工质对数温比和最佳热导率分配,使得功率达到三重最大值。因此通过同时优化热导率分配和热容率匹配得到的循环性能更接近实际情况,且此时循环功率存在三重最大值。研究成果可为Braysson循环的相关研究提供一定的参考。

关键词：有限时间热力学内可逆Braysson循环工质对数温比热导率分配热容率匹配性能优化

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