Transient thermal boundary layers over rough surfaces

被引：4
|
作者：
Loureiro, J. B. R. [1 ,2 ]
Silva Freire, A. P. [1 ]
机构：
[1] Univ Fed Rio de Janeiro, COPPE, Mech Engn Program PEM, BR-21941972 Rio de Janeiro, Brazil
[2] Univ Fed Rio de Janeiro, Poli, Mech Engn Dept DEM, BR-21941972 Rio de Janeiro, Brazil
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2014年 / 71卷
关键词：
Thermal boundary layer; Transient; Roughness; Error in origin; Reynolds analogy; TURBULENT PRANDTL NUMBER; HEAT-TRANSFER; STEP CHANGE; DOWNSTREAM; BEHAVIOR; HEIGHT; SMOOTH; FLOW;
D O I：
10.1016/j.ijheatmasstransfer.2013.11.076
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The transient heat transfer convection in a turbulent boundary layer is theoretically and experimentally studied when a time-periodical step-wise heat flux is imposed upon a rough surface. In particular, the behavior of the displacement height for the thermal boundary layer and the validity of the Reynolds analogy are analyzed. The local boundary layer characteristics, friction velocity, friction temperature and the displacement heights for the velocity and the temperature profiles, are evaluated through the graphical method of Perry and Joubert (1963) [3]. The results indicate that the displacement heights assume very different values and that the Reynolds analogy hypothesis is satisfied. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：217 / 227
页数：11
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