管内强化对流换热的热力经济性分析

Thermodynamic Performance Analysis of In-tube Intensified Convection Heat Transfer

鉴于管内换热和阻力同步增长的事实，依据Ｗｅｂｂ指标对管内强化对流换热方式下传热和流阻的综合热力性能进行了推导，得到了热力性能指标Ｑ／ＱＳ、Ｐ／ＰＳ和Ｆ／ＦＳ与管内对流换热努氏数Ｎｕ和管内阻力系数λ之间的函数关系式。在此基础上，对螺旋槽管强化管内换热的热力性能进行了分析。

In the light of the simultaneous increase of in-tube heat transfer and resistance the authors on the basis of Webb's index performed an evaluation of the complex thermodynamic performance of heat transfer and flow resistance under the conditions of in-tube intensified convection heat transfer. Thus obtained are functional relations between thermodynamic performance indexes Q/Qs, P/Ps and F/Fs on one side and in-tube convection heat transfer Nu and in-tube resistance factor l on the other side. On this basis an analysis was conducted of the thermodynamic performance of the intensified in-tube heat transfer inside spirally corrugated tubes.