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| 1 | 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 |
| 2 | 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 |
| 3 | 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 |
| 4 | 扩散传质定律等温结晶过程积耗散最小化显示文摘对一类给定结晶量下的等温结晶过程进行研究,考虑传质过程服从扩散传质定律[g∝Δ(c)],应用最优控制理论导出结晶过程积耗散最小时浓度最优构型,给出数值算例,并与熵产生最小、浓度一定和质流率一定的传质策略进行比较。结果表明,结晶过程积耗散最小时净结晶量的2/3次幂随时间呈线性规律变化,过程的积耗散率为常数,与等积耗散原则相一致,与以熵产生最小为目标的优化结果是显著不同的;浓度一定的传质策略下积耗散要小于质流率一定的传质策略下积耗散;积耗散最小和熵产生最小两种传质策略下的积耗散和熵产均小于其他两类传质策略下的积耗散和熵产。熵产生表征的是能量转化过程的不可逆性,质量积耗散表征的是质量传递过程的不可逆性,由于结晶过程不涉及能量转化,因此优化原则应为积耗散最小。 | 夏少军 陈林根 孙丰瑞 | 2013 | 机械工程学报2013，49，24： | 7 |
| 5 | Thermal performance analysis of non-uniform height rectangular fin based on constructal theory and entransy theory显示文摘A model of non-uniform height rectangular fin, in which the variation of base's thickness and width are taken into account, is established in this paper. The dimensionless maximum thermal resistance(DMTR) and the dimensionless equivalent thermal resistance(DETR) defined based on the entransy dissipation rate(EDR) are taken as performance evaluation indexes. According to constructal theory, the variations of the two indexes with the geometric parameters of the fin are analyzed by using a finite-volume computational fluid dynamics code, the effects of the fin-material fraction on the two indexes are analyzed. It is found that the two indexes decrease monotonically as the ratio between the front height and the back height of the fin increases subjected to the non-uniform height rectangular fin. When the model is reduced to the uniform height fin, the two indexes increase first and then decrease with increase in the ratio between the height of the fin and the fin space. The fin-material fraction has no effect on the change rule of the two indexes with the ratio between the height of the fin and the fin space. The sensitivity of the DETR to the geometric parameters of the fin is higher than that of the DMTR to the geometric parameters. The results obtained herein can provide some theoretical support for the thermal design of rectangular fins. | YANG Ai Bo CHEN Lin Gen XIE Zhi Hui FENG Hui Jun SUN Feng Rui | 2016 | Science China(Technological Sciences)2016，59，12： | 4 |
| 6 | 无限大平板非稳态导热过程的数字特征显示文摘对无限大平板非稳态导热过程的平均温度和耗散函数这2个数字特征进行了研究。得到了对流换热边界条件下无量纲平均过余温度的数学模型;分析了表面温度系数随特征值与毕渥数的变化规律;定义了相应的时间常数,它是衡量无量纲平均过余温度衰减速率快慢的指标;并对毕渥数取极限时无量纲平均过余温度的变化规律做了讨论。利用格林公式推导出了热势与耗散函数之间的关系,并与机械能耗散系统进行了相似性分析。得到了对流换热边界条件下耗散函数随时间的变化规律,并将其与平均过余温度的变化规律做了比较。 | 王永岩 秦楠 苏传奇 | 2013 | 青岛科技大学学报(自然科学版)2013，34，5： | 2 |
| 7 | Experimental investigation of evaporative cooling systems for agricultural storage and livestock air-conditioning in Pakistan显示文摘Evaporative cooling(EC)is an ancient technique that is usually suitable for hot and dry climatic conditions due to the potential of water vapor evaporation.In this study,three kinds of evaporative cooling systems such as direct EC(DEC),indirect EC(IEC),and Maisotsenko cycle EC(MEC)were locally developed at lab-scale.The performance of the systems was evaluated and compared for agricultural storage and livestock air-conditioning application in Pakistan.The experiments were performed for climatic conditions of Multan city(Pakistan)and the data were collected for hourly and daily basis.According to the results,it was observed that the DEC system has the ability to reduce the temperature of ambient air to an average of 8.5℃.Whilst IEC and MEC systems were able to drop the temperature of ambient air to an average of 6.8℃and 8.9℃,respectively.As per the results,the DEC system remained behind to provide desired conditions for livestock and agricultural product storage applications due to excessive humidity.On the other hand,the IEC and MEC systems can achieve the desired conditions for livestock application,but could not provide feasible conditions for various fruits and vegetable storage.The study concludes that hybrid EC systems can be developed to provide desired conditions for a wide range of applications under varying climatic conditions. | Hafiz M.U.Raza Muhammad Sultan Majid Bahrami Alamgir A.Khan | 2021 | Building Simulation2021，14，3： | 0 |
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