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>Heat transfer analysis in a two-side heated smooth square vertidcal channel with adverse and favorable mixed convection
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Heat transfer analysis in a two-side heated smooth square vertidcal channel with adverse and favorable mixed convection
Experimental heat transfer measurements and analysis for mixed convection in a vertical square channel are presented. The flow direction is changed with respect to the earth's gravity field by selectively opering and closing the flow control valves. Desired flow directions are selected such that buoyancy assits or opposes the bulk flow direction pressure gradient. The heating condition is asymmetric. Most previous exeriments used symmetrically heated circular tubes. Present configuration shows significant incrase in the Nusselt number in both assisted and opposed flow conditions. In general, opposed flow shows high heat transfer coefficients. Unlinke symmetric heating conditions, Nusselt number ratio is observed to be incresing with increasing Gr/Re or Gr/Re~2 ratios for both assisted and opposed flow conditions.
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