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Title: Turbulent heat transfer with combined forced and natural convection along a vertical flat plate. Effect of Prandtl number

The turbulent heat transfer of combined forced and natural convection along a vertical flat plate was investigated experimentally both with aiding and opposing flows of air. Local heat-transfer coefficients were measured in the vertical direction. The results show that the local Nusselt numbers for aiding flow become smaller than those for the forced and the natural convection, while the Nusselt numbers for the opposing flow are increased significantly. These results are compared with the previous results for water. It has been found that the nondimensional parameter Z(= Gr{sub x}*/Nu{sub x}Re{sub x}){sup 2.7}Pr{sup 0.6} can predict the behavior of heat transfer both for air and water. Furthermore, the natural, forced, and combined convection regions can be classified in terms of the above parameter.
Authors:
 [1] ;  [2]
  1. (Toyota College of Technology (JP))
  2. (Toyohashi Univ. of Technology (JP))
Publication Date:
OSTI Identifier:
6427618
Resource Type:
Journal Article
Resource Relation:
Journal Name: Heat Transfer - Japanese Research; (USA); Journal Volume: 19:2
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 14 SOLAR ENERGY; AIR; HEAT TRANSFER; FLAT PLATE COLLECTORS; TURBULENT FLOW; WATER; AIR FLOW; EXPERIMENTAL DATA; FORCED CONVECTION; MEASURING METHODS; NATURAL CONVECTION; NUSSELT NUMBER; PRANDTL NUMBER; CONVECTION; DATA; ENERGY TRANSFER; EQUIPMENT; FLUID FLOW; FLUIDS; GAS FLOW; GASES; HYDROGEN COMPOUNDS; INFORMATION; MASS TRANSFER; NUMERICAL DATA; OXYGEN COMPOUNDS; SOLAR COLLECTORS; SOLAR EQUIPMENT 420400* -- Engineering-- Heat Transfer & Fluid Flow; 142000 -- Solar Energy-- Heat Storage-- (1980-); 141000 -- Solar Collectors & Concentrators