Measurements of heat transfer and flow structure in heated vertical channels

C. Gau, K. A. Yih, W. Aung

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24 Citations (Scopus)

Abstract

Experiments are performed to study the buoyancy effects on the heat transfer and flow process in a finite, vertical, rectangular channel. One of the walls is insulated and the opposite wall is heated uniformly. Air flow with a uniform velocity profile is made to enter the channel. Both the cases for buoyancy-assisted flow and opposed flow are studied. The mean velocity is controlled so that the channel flow is either laminar or turbulent when the plate is not heated. Flow visualization and temperature fluctuation measurements are conducted and used to provide information on flow structure. For buoyancy opposed flow, the occurrence of flow reversal, separation of flow, and generation of vortices are observed, which cause oscillations of the mainstream and lead to fluctuations in temperature. Flow reversal occurs initially in the downstream region and extends gradually upstream as the buoyancy parameter GrIRe2 increases, which destabilizes the flow structure and enhances the heat transfer process in the region it traverses. The effect of buoyancy on the local and the average Nusselt number over the heated plate is measured and presented. Correlations of Nusselt number in terms of relevant nondimensional parameters are obtained for the Reynolds number varied from 600 to 2200 and the buoyancy parameter GrIRe2 from 0.7 to 95.

Original languageEnglish
Pages (from-to)707-712
Number of pages6
JournalJournal of thermophysics and heat transfer
Volume6
Issue number4
DOIs
Publication statusPublished - 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Space and Planetary Science

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