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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Designing optimal heat transfer experiments − A case study

Get access (open in a dialog) DOI: 10.1615/IHTC12.2070
6 pages

要約

Transient and steady state free convection from a heated horizontal cylinder was measured in a realistic environment. The experiment was designed to infer the constants C and n in the correlation Nu = CRan and the surface emissivity. An analysis of the experiment revealed that the coefficient and exponent of the correlation could be well estimated, but not if the emissivity were also to be estimated. The steady state heat transfer was found to be in reasonable agreement with standard correlations. The transient heat transfer during heating was found to be significantly higher than that given by steady state correlations based upon the instantaneous surface temperature and to approach steady state much slower than predicted by simulations. Heat transfer during cooling was found to be less than steady state values at all times and to have a more rapid time behavior.