Conference Proceeding

Unsteady heat transfer near a bluff body in contact with a moving wall

Dept. of Mech. Eng., California Univ., Berkeley, CA;
06/1988; DOI:10.1109/ITHERM.1988.28696 pp.148 - 153 In proceeding of: Thermal Phenomena in the Fabrication and Operation of Electronic Components: I-THERM '88, InterSociety Conference on
Source: IEEE Xplore

ABSTRACT Results of a numerical study concerning two-dimensional
time-dependent laminar flow near a square bluff body are reported. The
configuration investigated is that of flow around a square block in
contact with a moving wall, with fluid approaching the block parallel to
the wall and at the wall speed. This geometry provides a two-dimensional
model for the flow near a magnetic head-arm assembly flying over a
rotating disk. Numerical calculations were also made for the case of
flow past a square block adjacent to a fixed wall. The Reynolds numbers
investigated ranged from 100 to 1000. Comparisons between the two
calculated cases show that a moving wall exerts a significant
destabilizing effect on the recirculation region behind a block, leading
to a lower Reynolds number for the onset of flow unsteadiness. The
vortex shedding phenomenon has been characterized in terms of the
Strouhal number, and plots of Strouhal number versus Reynolds number are
presented for the moving wall and fixed wall cases. Plots of the Nusselt
number variation with time and Reynolds number are also presented

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Keywords

block parallel
 
cases
 
Comparisons
 
fixed wall
 
flow unsteadiness
 
lower Reynolds number
 
magnetic head-arm assembly
 
moving wall
 
moving wall exerts
 
Numerical calculations
 
numerical study
 
recirculation region
 
Reynolds number
 
Reynolds numbers
 
rotating disk
 
square block
 
square block adjacent
 
square bluff body
 
Strouhal number
 
wall cases