Heat transfer rates were experimentally measured for laminar convection air flows in rectangular enclosures with one isothermal heated vertical wall, a concentrated cooling strip on the opposing wall, and adiabatic top and bottom plates. Both local and overall heat transfer data were obtained by the use of a Wollaston prism schlieren interferometer. The aspect ratio of the enclosure and size and location of the cooling strip were parametrically varied for Grashof numbers of 5 × 106 to 9 × 106. Results are compared to previously available theoretical predictions for low Grashof numbers (105). Correlations are presented such that the theoretical predictions can be extended to Grashof numbers up to 107. The present data also indicate the dependence of heat transfer rates on the geometric parameters.

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