PIV flow measurements for heat transfer characterization in two-pass square channels with smooth and 90° ribbed walls Academic Article uri icon

abstract

  • Particle image velocimetry (PIV) experiments have been carried out to study the correlation between the high-Reynolds number turbulent flow and wall heat transfer characteristics in a two-pass square channel with a smooth wall and a 90° rib-roughened wall. Detailed averaged velocity distributions and turbulent kinetic energy for both the main and the secondary flows are given for a representative Reynolds number (Re) of 30,000. The PIV measurement results were compared with the heat transfer experimental data of Ekkad and Han [International Journal of Heat Mass Transfer 40 (11) (1997) 2525-2537]. The result shows that the flow impingement is the primary factor for the two-pass square channel heat transfer enhancement rather than the flow turbulence level itself. The characteristics of the secondary flow, for example, vortex's shape, strength, rotating-direction and positions, are closely correlated with the wall heat transfer enhancements for both smooth and ribbed wall two-pass square channels. The rib-induced flow turbulence increases the heat transfer mainly because of the enhanced local flow impingement near the rib. © 2002 Elsevier Ltd. All rights reserved.

author list (cited authors)

  • Son, S. Y., Kihm, K. D., & Han, J.

citation count

  • 93

complete list of authors

  • Son, SY||Kihm, KD||Han, J-C

publication date

  • November 2002