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Constructal design for a steam generator based on entransy dissipation extremum principle 被引量:13

Constructal design for a steam generator based on entransy dissipation extremum principle
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摘要 Steam generator is optimized by applying entransy dissipation extremum principle and constructal theory and adopting analyti-cal method.The obtained results show that the optimal spacing between adjacent tubes,the mass flow rate of gas and the maximum entransy dissipation rate all depend on the dimensionless diameter of one tube,the dimensionless pressure difference number and the dimensionless length of flow channel of gas.Besides the three dimensionless groups,the optimal numbers of riser tubes and downcomer tubes and their summation all depend on the dimensionless height of one tube.The maximum entransy dissipation rate increases as the pressure difference that drives the gas flowing increases,and as the diameter of one tube and the length of flow channel both decrease.The mean heat flux in the heat transfer process of hot gas grows greatly,and the performance of the system is improved.Compared with the optimal construct with heat transfer rate maximization,the optimal construct with entransy dissipation rate maximization can improved the heat transfer effect of the steam generator more.
机构地区 Postgraduate School
出处 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第6期1462-1468,共7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 10905093) the Program for New Century Excellent Talents in University of China (Grant No NCET-04-1006) the Foun-dation for the Author of National Excellent Doctoral Dissertation of China (Grant No 200136)
关键词 entransy dissipation extremum principle constructal theory steam generator entransy dissipation rate generalized thermodynamic optimization 蒸汽发生器 极值原理 构形理论 耗散率 气体质量流量 设计 无量纲 最佳间距
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