HEAT TRANSFER IN RECTANGULAR DUCTS WITH TWO HEATED AND TWO UNHEATED WALLS
The fully developed heat transfer characteristics for air flowing in rectangular ducts of aspect ratio 1: 1, 5: 1, and 10: 1 were determined experimentally for the case in which one pair of walls is uniformly heated and the other pair is unheated. The results cover the Reynolds number range from 11,000 to 140,000. The Nusselt numbers of the experiment were in satisfactory agreement with an analysis for the parallel-plate channel, with the largest deviations ( approximates 12%) between theory and experiment occurring in the range of low Reynolds numbers. The circular tube analysis also agreed satisfactorily with the data. For all of the ducts, the thermal entrance region appeared not to exceed 30 hydraulic diameters within the Reynolds number range of the experiment. The influence of spanwise heat conduction from the heated walls into the unheated walls was evident. (M.C.G)
- Research Organization:
- Minnesota. Univ., Minneapolis. Heat Transfer Lab.
- DOE Contract Number:
- AT(11-1)-659
- NSA Number:
- NSA-17-030665
- OSTI ID:
- 4692308
- Report Number(s):
- TID-19090; HTL-TR-52
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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