Buoyancy-induced recirculation bubbles and heat convection of developing flow in vertical channels with fin arrays

Chin-Hsiang Cheng, Jyh Jye Yang

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13 Citations (Scopus)

Abstract

Developing fluid flow and heat transfer characteristics of the mixed convection in a vertical parallel-plate channel with fin array are analyzed in this study. The channel walls are maintained at uniform but unequal temperatures, and the fins of extremely high thermal conductivity are mounted on the relatively hotter wall. The stream function-vorticity method coupled with the power-law scheme are employed to solve the continuity, momentum and energy equations numerically. Results show that the streamwise periodic variation of the cross-sectional area causes the flow and temperature fields to attain a periodically fully developed character after a number of modules from the inlet. Meanwhile, if wall heating is sufficiently strong, an adverse pressure gradient can be developed downstream in the channel, and a series of buoyancy-induced recirculation bubbles may appear adjacent to the colder wall. The periodically fully developed solutions provided by Cheng et al. (Int. J. Heat Mass Transfer 1992, 35, 2643-2653) are found to accurately portray the behavior of the present developing flow in the downstream region.

Original languageEnglish
Pages (from-to)11-19
Number of pages9
JournalInternational Journal of Heat and Fluid Flow
Volume15
Issue number1
DOIs
Publication statusPublished - 1994 Jan 1

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Heat convection
Mixed convection
Fins (heat exchange)
fins
Vorticity
Buoyancy
Pressure gradient
Bubbles (in fluids)
buoyancy
Flow of fluids
Thermal conductivity
Flow fields
Momentum
Temperature distribution
convection
bubbles
Mass transfer
Heat transfer
Heating
heat

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "Developing fluid flow and heat transfer characteristics of the mixed convection in a vertical parallel-plate channel with fin array are analyzed in this study. The channel walls are maintained at uniform but unequal temperatures, and the fins of extremely high thermal conductivity are mounted on the relatively hotter wall. The stream function-vorticity method coupled with the power-law scheme are employed to solve the continuity, momentum and energy equations numerically. Results show that the streamwise periodic variation of the cross-sectional area causes the flow and temperature fields to attain a periodically fully developed character after a number of modules from the inlet. Meanwhile, if wall heating is sufficiently strong, an adverse pressure gradient can be developed downstream in the channel, and a series of buoyancy-induced recirculation bubbles may appear adjacent to the colder wall. The periodically fully developed solutions provided by Cheng et al. (Int. J. Heat Mass Transfer 1992, 35, 2643-2653) are found to accurately portray the behavior of the present developing flow in the downstream region.",
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N2 - Developing fluid flow and heat transfer characteristics of the mixed convection in a vertical parallel-plate channel with fin array are analyzed in this study. The channel walls are maintained at uniform but unequal temperatures, and the fins of extremely high thermal conductivity are mounted on the relatively hotter wall. The stream function-vorticity method coupled with the power-law scheme are employed to solve the continuity, momentum and energy equations numerically. Results show that the streamwise periodic variation of the cross-sectional area causes the flow and temperature fields to attain a periodically fully developed character after a number of modules from the inlet. Meanwhile, if wall heating is sufficiently strong, an adverse pressure gradient can be developed downstream in the channel, and a series of buoyancy-induced recirculation bubbles may appear adjacent to the colder wall. The periodically fully developed solutions provided by Cheng et al. (Int. J. Heat Mass Transfer 1992, 35, 2643-2653) are found to accurately portray the behavior of the present developing flow in the downstream region.

AB - Developing fluid flow and heat transfer characteristics of the mixed convection in a vertical parallel-plate channel with fin array are analyzed in this study. The channel walls are maintained at uniform but unequal temperatures, and the fins of extremely high thermal conductivity are mounted on the relatively hotter wall. The stream function-vorticity method coupled with the power-law scheme are employed to solve the continuity, momentum and energy equations numerically. Results show that the streamwise periodic variation of the cross-sectional area causes the flow and temperature fields to attain a periodically fully developed character after a number of modules from the inlet. Meanwhile, if wall heating is sufficiently strong, an adverse pressure gradient can be developed downstream in the channel, and a series of buoyancy-induced recirculation bubbles may appear adjacent to the colder wall. The periodically fully developed solutions provided by Cheng et al. (Int. J. Heat Mass Transfer 1992, 35, 2643-2653) are found to accurately portray the behavior of the present developing flow in the downstream region.

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