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| 1 | Progress in study on constructal theory and its applications显示文摘The emergence and development of constructal theory,which has been a new discipline branch to research sorts of structures in nature and engineering,are reviewed.The core of the constructal theory is that various shapes and structures of the matters in nature are generated from the tendency to obtain optimal performance.Constructal theory and its application are summarized,from disciplines such as heat,mechanism,fluid flow,electricity,magnetism and chemistry,to life and non-life systems in nature. | CHEN LinGen | 2012 | Science China(Technological Sciences)2012，55，3： | 47 |
| 2 | Progress in entransy theory and its applications显示文摘The entransy and entransy dissipation extremum principle proposed have opened up a new direction for the heat transfer optimi-zation. The emergence and development of entransy theory are reviewed. Entransy theory and its applications are summarized from several aspects, such as heat conduction, heat convective, heat radiation, heat exchanger design and mass transfer, etc. The emphases are focused on four aspects, i.e., the comparison between entropy generation rate and entransy dissipation rate, the combination of entransy dissipation extreme principle with finite time thermodynamics, the combination of entransy dissipation extreme principle with the heat conduction constructal theory, and the combination of entransy dissipation extreme principle with the heat convective constructal theory. The scientific features of entransy theory are emphasized. | CHEN LinGen | 2012 | Chinese Science Bulletin2012，57，34： | 42 |
| 3 | Progress in optimization of mass transfer processes based on mass entransy dissipation extremum principle显示文摘The mass entransy and its dissipation extremum principle have opened up a new direction for the mass transfer optimization. Firstly, the emergence and development process of both the mass entransy and its dissipation extremum principle are reviewed. Secondly, the combination of the mass entransy dissipation extremum principle and the finite-time thermodynamics for optimizing the mass transfer processes of one-way isothermal mass transfer, two-way isothermal equimolar mass transfer, and isothermal throttling and isothermal crystallization are summarized. Thirdly, the combination of the mass entransy dissipation extremum principle and the constructal theory for optimizing the mass transfer processes of disc-to-point and volume-to-point problems are summarized. The scientific features of the mass entransy dissipation extremum principle are emphasized. | CHEN Lin Gen | 2014 | Science China(Technological Sciences)2014，57，12： | 34 |
| 4 | Constructal entransy dissipation rate minimization for leaf-like fins显示文摘Based on constructal theory,the constructs of the leaf-like fins are optimized by taking minimum entransy dissipation rate(for the fixed total thermal current,i.e.,the equivalent thermal resistance) as optimization objective.The optimal constructs of the leaf-like fins with minimum dimensionless equivalent thermal resistance are obtained.The results show that there exists an optimal elemental leaf-like fin number,which leads to an optimal global heat conduction performance of the first order leaf-like fin.The Biot number has little effects on the optimal elemental fin number,optimal ratios of length and width of the elemental and first order leaf-like fins;with the increase of the thermal conductivity ratio of the vein and blade,the optimal elemental fin number and optimal ratio of the length and width of the elemental leaf-like fin increase,and the optimal shape of the first order leaf-like fin becomes tubbier.The optimal construct based on entransy dissipation rate minimization is obviously different from that based on maximum temperature difference minimization.The dimensionless equivalent thermal resistance based on entransy dissipation rate minimization is reduced by 11.54% compared to that based on maximum temperature difference minimization,and the global heat conduction performance of the leaf-like fin is effectively improved.For the same volumes of the elemental and first order leaf-like fins,the minimum dimensionless equivalent thermal resistance of the first order of the leaf-like fin is reduced by 30.10% compared to that of the elemental leaf-like fin,and the global heat conduction performance of the first order leaf-like fin is obviously better than that of the elemental leaf-like fin.Essentially,this is because the temperature gradient field of the first order leaf-like fin based on entransy dissipation rate minimization is more homogenous than that of the elemental leaf-like fin.The dimensionless equivalent thermal resistance defined based on entransy dissipation rate reflects the average heat transfer performance of the leaf-like fin,and can provide some guidelines for the thermal design of the fins from the viewpoint of heat transfer optimization. | FENG HuiJun CHEN LinGen SUN FengRui | 2012 | Science China(Technological Sciences)2012，55，2： | 19 |
| 5 | Constructal entransy optimizations for insulation layer of steel rolling reheating furnace wall with convective and radiative boundary conditions显示文摘Based on the entransy dissipation extremum principle for thermal insulation process,the constructal optimizations for a plane insulation layer of the steel rolling reheating furnace wall with convective and radiative boundary conditions are carried out by taking the minimization of entransy dissipation rate as optimization objective.The optimal construct of the plane insulation layer is obtained.The results show that for the convective heat transfer boundary condition,the optimal constructs of the insulation layer obtained based on the minimizations of the entransy dissipation rate and heat loss rate are obviously different.Comparing the optimal construct obtained based on the minimization of the entransy dissipation rate with that based on the minimization of the heat loss rate,the entransy dissipation rate is reduced by 5.98%,which makes the global thermal insulation performance of the insulation layer improve.For the combined convective and radiative heat transfer boundary condition,compared the insulation layer having an increasing thickness with that having constant thickness and a decreasing thickness,the entransy dissipation rates are reduced by 16.59%and39.72%,respectively,and the global thermal insulation performance of the insulation layer is greatly improved.There exits an optimal constant coefficient a2;optwhich leads to the minimum dimensionless entransy dissipation rate of the insulation layer.The difference between the optimal constant coefficients a2;optobtained based on the minimizations of the entransy dissipation rate and the maximum temperature gradient of the insulation layer is small.This makes the corresponding thermal stress obtained based on the minimum dimensionless entransy dissipation rate also be small,and the global thermal insulation performance and thermal safety of the insulation layer are improved simultaneously.The results obtained can provide some guidelines for the optimal designs of the insulation layers. | Huijun Feng Lingen Chen Zhihui Xie Fengrui Sun | 2014 | Chinese Science Bulletin2014，59，20： | 19 |
| 6 | Constructal optimization for H-shaped multi-scale heat exchanger based on entransy theory显示文摘Analogizing with the definition of thermal efficiency of a heat exchanger,the entransy dissipation efficiency of a heat exchanger is defined as the ratio of dimensionless entransy dissipation rate to dimensionless pumping power of the heat exchanger.For the constraints of the total tube volume and total tube surface area of the heat exchanger,the constructal optimization of an H-shaped multi-scale heat exchanger is carried out by taking entransy dissipation efficiency maximization as optimization objective,and the optimal construct of the H-shaped multi-scale heat exchanger with maximum entransy dissipation efficiency is obtained.The results show that for the specified total tube volume of the heat exchanger,the optimal constructs of the first order T-shaped heat exchanger based on the maximizations of the thermal efficiency and entransy dissipation efficiency are obviously different with the lower mass flow rates of the cold and hot fluids.For the H-shaped multi-scale heat exchanger,the entransy dissipation efficiency decreases with the increase in mass flow rate when the heat exchanger order is fixed;for the specified dimensionless mass flow rate M(M<32.9),the entransy dissipation efficiency decreases with the increase in the heat exchanger order.The performance of the multi-scale heat exchanger is obviously improved compared with that of the single-scale heat exchanger.Moreover,the heat exchanger subjected to the total tube surface area constraint is also discussed in the paper.The optimization results obtained in this paper can provide a great compromise between the heat transfer and flow performances of the heat exchanger,provide some guidelines for the optimal designs of heat exchangers,and also enrich the connotation of entransy theory. | FENG HuiJun CHEN LinGen XIE ZhiHui SUN FengRui | 2013 | Science China(Technological Sciences)2013，56，2： | 16 |
| 7 | Thermal insulation constructal optimization for steel rolling reheating furnace wall based on entransy dissipation extremum principle显示文摘Analogizing with the heat conduction process, the entransy dissipation extremum principle for thermal insulation process can be described as: for a fixed boundary heat flux (heat loss) with certain constraints, the thermal insulation process is optimized when the entransy dissipation is maximized (maximum average temperature difference), while for a fixed boundary temperature, the thermal insulation process is optimized when the entransy dissipation is minimized (minimum average heat loss rate). Based on the constructal theory, the constructal optimizations of a single plane and cylindrical insulation layers as well as multi-layer insulation layers of the steel rolling reheating furnace walls are carried out for the fixed boundary temperatures and by taking the minimization of entransy dissipation rate as optimization objective. The optimal constructs of these three kinds of insulation structures with distributed thicknesses are obtained. The results show that compared with the insulation layers with uniform thicknesses and the optimal constructs of the insulation layers obtained by minimum heat loss rate, the optimal constructs of the insulation layers obtained by minimum entransy dissipation rate are obviously different from those of the former two insulation layers; the optimal constructs of the insulation layers obtained by minimum entransy dissipation rate can effectively reduce the average heat loss rates of the insulation layers, and can help to improve their global thermal insulation performances. The entransy dissipation extremum principle is applied to the constructal optimizations of insulation systems, which will help to extend the application range of the entransy dissipation extremum principle. | FENG HuiJun CHEN LinGen XIE ZhiHui SUN FengRui | 2012 | Science China(Technological Sciences)2012，55，12： | 14 |
| 8 | Generalized constructal optimization for the secondary cooling process of slab continuous casting based on entransy theory显示文摘Based on constructal theory and entransy theory,a generalized constructal optimization of a solidification heat transfer process of slab continuous casting for a specified total water flow rate in the secondary cooling zone was carried out.A complex function was taken as the optimization objective to perform the casting.The complex function was composed of the functions of the entransy dissipation and surface temperature gradient of the slab.The optimal water distribution at the sections of the secondary cooling zone were obtained.The effects of the total water flow rate in the secondary cooling zone,casting speed,superheat and water distribution on the generalized constructal optimizations of the secondary cooling process were analyzed.The results show that on comparing the optimization results obtained based on the optimal water distributions of the 8 sections in the secondary cooling zone with those based on the initial ones,the complex function and the functions of the entransy dissipation and surface temperature gradient after optimization decreased by 43.25%,5.90%and 80.60%,respectively.The quality and energy storage of the slab had obviously improved in this case.The complex function,composed of the functions of the entransy dissipation and surface temperature gradient of the slab,was a compromise between the internal and surface temperature gradients of the slab.Essentially,it is also the compromise between energy storage and quality of the slab.The'generalized constructal optimization'based on the minimum complex function can provide an optimal alternative scheme from the point of view of improving energy storage and quality for the parameter design and dynamic operation of the solidification heat transfer process of slab continuous casting. | FENG HuiJun CHEN LinGen XIE ZhiHui DING ZeMin SUN FengRui | 2014 | Science China(Technological Sciences)2014，57，4： | 14 |
| 9 | Constructal optimization of cylindrical heat sources with forced convection based on entransy dissipation rate minimization显示文摘Based on constructal theory and entransy theory,the optimal designs of constant-and variable-cross-sectional cylindrical heat sources are carried out by taking dimensionless equivalent resistance minimization as optimization objective.The effects of the cylindrical height,the cylindrical shape and the ratio of thermal conductivity of the fin to that of the heat source are analyzed.The results show that when the volume of the heat source is fixed,there exists an optimal ratio of the center-to-centre distance of the fin and the heat source to the cylinder radius which leads to the minimum dimensionless equivalent thermal resistance.With the increase in the height of the cylindrical heat source and the ratio of thermal conductivity,the minimum dimensionless equivalent thermal resistance decreases gradually.For the heat source model with inverted variable-cross-sectional cylinder,there exist an optimal ratio of the center-to-centre distance of the fin and the heat source to the cylinder radius and an optimal radius ratio of the smaller and bigger circles of the cylindrical fin which lead to a double minimum dimensionless equivalent thermal resistance.Therefore,the heat transfer performance of the cylindrical heat source is improved by adopting the cylindrical model with variable-cross-section.The optimal constructs of the cylindrical heat source based on the minimizations of dimensionless maximum thermal resistance and dimensionless equivalent thermal resistance are different.When the thermal security is ensured,the optimal construct of the cylindrical heat source based on minimum equivalent thermal resistance can provide a new alternative scheme for the practical design of heat source.The results obtained herein enrich the work of constructal theory and entransy theory in the optimal design field of the heat sources,and they can provide some guidelines for the designs of practical heat source systems. | GONG ShuWen CHEN LinGen XIE ZhiHui FENG HuiJun SUN FengRui | 2016 | Science China(Technological Sciences)2016，59，4： | 12 |
| 10 | Entransy dissipation,entransy-dissipation-based thermal resistance and optimization of one-stream hybrid thermal network显示文摘The one-stream hybrid thermal network is analyzed and discussed based on the entransy theory,and the results are compared with those from the entropy generation optimization.The theoretical analysis indicates that the minimum heat-flow-weighted temperature of the thermal networks corresponds to the minimum entransy dissipation rate and the minimum thermal resistance.For a simple hybrid thermal network consisting of three thermal components,the expression of entransy dissipation is conducted,and the heat transfer area and the mass flow rate are calculated and optimized.The optimal results are obtained in order to minimize the entransy dissipation and the thermal resistance.The optimal results are calculated for various combinations,such as series connection,parallel connection and other hybrid connections.The numerical results are in accordance with the theoretical analysis.Both the theoretical analysis and the numerical results show that the minimum entransy dissipation and the minimum thermal resistance correspond to the minimum heat-flow-weighted temperature of the thermal networks while the minimum entropy generation does not. | WANG WenHua CHENG XueTao LIANG XinGang | 2013 | Science China(Technological Sciences)2013，56，2： | 11 |
| 11 | 非均匀产热“盘-点”导热构形设计显示文摘建立非均匀产热“盘-点”导热模型,以[火积]耗散率最小为目标,分别对辐射状圆盘、恒截面高导热通道树状圆盘和变截面高导热通道树状圆盘进行构形优化,在不同产热分布条件下得到圆盘产热体的最优构形,分析非均匀产热系数和宽度系数等参数对构形优化结果的影响。结果表明:对于恒截面高导热通道树状圆盘,在总产热量恒定的情况下,靠近冷源位置处产热量越大,茎趋向于粗长,而分支趋向于细短,即产热量相对较大的区域布置较多的高导热材料可降低产热体[火积]耗散率,降低传热的等效温差,并提高树状圆盘导热性能。当树状圆盘内包含的单元体数目小于9时,树状圆盘有简化为辐射状圆盘的趋势;当圆盘产热体包含20个单元体时,辐射状圆盘单元体内无量纲[火积]耗散率为0.00369;恒截面高导热通道树状圆盘单元体内二次最小无量纲[火积]耗散率为0.00329;而变截面高导热通道树状圆盘单元体内三次最小无量纲[火积]耗散率为0.00328,因此采用变截面高导热通道树状结构可进一步降低产热体内的[火积]耗散,提升其导热性能。所得优化结果可为电子器件的散热优化设计提供理论指导。 | 尤江 陈林根 冯辉君 | 2019 | 工程热物理学报2019，40，9： | 4 |
| 12 | 基于■耗散率最小的燃气涡轮叶片冷却构形优化显示文摘基于构形理论,以■耗散率最小为优化目标,对燃气涡轮基元级叶片进行构形优化,得到量纲一当量热阻最小的基元级叶片最优构形。结果表明:在基元级叶片总横截面积和空腔占比一定的条件下,存在最佳空腔直径与叶片厚度比使得基元级叶片量纲一当量热阻取得最小值,但不存在最佳空腔边距与叶片厚度比、最佳叶片厚度与长度比使得基元级叶片量纲一当量热阻取得最小值。在叶片结构强度允许的前提下,提高空腔占比,减小空腔与叶片表面的距离,保持基元级叶片狭长均有利于提高基元级叶片的整体传热性能。■耗散率最小和最大温差最小的基元级叶片最优构形是明显不同的,■耗散率最小的构形优化比最大温差最小的构形优化更能有效地降低基元级叶片的平均传热温差,提高其整体传热性能。此外,通过对基元级叶片冷却空腔进行多尺度构形优化,其整体传热性能也得到明显提高。 | 冯辉君 陈林根 谢志辉 孙丰瑞 | 2014 | 机械工程学报2014，50，4： | 2 |
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