圆筒内层流对流换热的最佳速度场及工程应用  

Optimal velocity field for laminar convection heat transfer in a cylinder and its application in engineering

作　　者：苏欣[1] 孟继安[1] 程新广[1] 过增元[1] 

机构地区：[1]清华大学工程力学系传热强化与过程节能教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第5期677-680,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(G2000026301)

摘　　要：在粘性耗散一定的条件下,以热量传递势容耗散取得极值为优化目标,利用变分方法可以导出稳态层流对流换热的场协同方程。该文利用场协同方程,通过Fluent6.0对含有均匀内热源、边界条件与实际搅拌器相近的圆筒内水的对流换热进行数值求解,得到了由多个涡构成的、规则合理的速度场分布。在粘性耗散和圆筒体积一定的条件下,最佳速度场会随着圆筒长径比的不同而发生变化,而且在某些条件下得到的优化流型与工业中搅拌器的常用流型十分相似。这些优化流型对搅拌器的选择和设计具有一定的辅助意义。The field coordination equation for steady laminar convection heat transfer was derived for constant viscous dissipation using the variational method to maximize the heat transport potential capacity dissipation. The field coordination equation was numerically solved using Fluent 6.0 for water convection heat transfer in a cylinder with uniform inner heat sources, with boundary conditions similar to those for practical agitator tanks. The regular velocity fields had several vortexes. The results show that the optimal velocity field varies with changing cylinder slenderness ratio when the viscous dissipation and the cylinder volume are kept constant. Some of the optimal flow patterns are very similar to common agitator flow patterns. The optimal flow patterns can facilitate the design and selection of agitators.

关 键 词：对流换热 场协同方程 最佳速度场 涡流 搅拌 流型 

分 类 号：TK124[动力工程及工程热物理—工程热物理]