摘要
肋片作为一种非常高效的强化传热技术,不仅是作为二次传热面,扩大传热面积,并促进流体介质扰动来强化换热,同时其增加的传热面积也会造成相对增加的流动阻力.
The purpose of this paper is to find a new way of fin design to minimize the irreversibilities due to heat transfer and fluid friction and maximize the available work of the working fluid. The general entropy generation formulas for fins are derived at first according to the first and second law of thermodynamics, then a theoretical analysis on cylindrical pin fins and rectangular straight fins is made by using the above formulas. The minimum entropy generation formulas for these two types of fins are obtained and a principle for fin optimization is proposed, where the minimum entropy generation is chosen to be the objective function to be studied. The effect of different parameters on fin entropy generation is discussed in detail in forced convection heat transfer.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1999年第1期118-124,共7页
CIESC Journal
基金
浙江省中青年人才基金资助项目
关键词
肋片
熵产
不可逆
换热器
fin, entropy generation, irreversibility
