SHARP ENTRY AND TRANSITION EFFECTS FOR LAMINAR COMBINED CONVECTION OF WATER IN VERTICAL TUBES.

被引：9

作者：

Barozzi, G.S. ^{[1
]}

Dumas, A. ^{[1
]}

Collins, M.W. ^{[1
]}

机构：

[1] Facolta di Ingegneria, Istituto di, Fisica Tecnica, Bologna, Italy, Facolta di Ingegneria, Istituto di Fisica Tecnica, Bologna, Italy

来源：

International Journal of Heat and Fluid Flow | 1984年 / 5卷 / 04期

关键词：

FLOW OF FLUIDS - Pipes - HEAT TRANSFER - Convection;

D O I：

10.1016/0142-727X(84)90060-2

中图分类号：

学科分类号：

摘要：

In previous work the authors showed a sharp entry to have a definite effect on laminar forced convection to water in a vertical circular tube. The study has been extended to situations of strong aiding natural convection, and new experimental data and numerical predictions are reported. The expected entry effect is confirmed, but it is found to be less marked in a strong combined convection field than in the previous forced convection study. The experimental data also include evidence of transition from laminar flow, and a possible criterion of transition is investigated, based on the axial location of minimum local Nusselt number.

引用

页码：235 / 241