Convective heat transfer downstream of a 3-D backward-facing step

被引：23
|
作者：
Carrington, DB
Pepper, DW
机构：
[1] Univ Nevada, Dept Mech Engn, Las Vegas, NV 89154 USA
[2] Los Alamos Natl Lab, Los Alamos, NM USA
来源：
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS | 2002年 / 41卷 / 6-7期
关键词：
D O I：
10.1080/104077802317418214
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Numerical solutions are obtained for fluid flow and heat transfer downstream of a 3-D backward-facing step within a duct. A heat flux is applied along the bottom surface downstream of the step. The dimensions downstream of the step are 30Hx12HxH, where H=1 cm (channel height); uniform flow enters a 20Hx12HxH/2 channel upstream of the step. The numerical model is based on a modified Petrov-Galerkin finite element technique that incorporates sparse storage solution with mass lumping. A projection algorithm is used to solve the primitive equations of motion. Upper and lower recirculation zones in the 3-D solutions are very different from 2-D results. Solutions obtained for Re = 400, 800, and 1200 are presented that illustrate changing recirculation and vortex zones. A time history shows the evolution of velocities along the centerline at Re = 800. Bulk Nusselt numbers converge to experimental values downstream of the step where the flow returns to a fully developed parabolic profile.
引用
收藏
页码：555 / 578
页数：24
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