Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

A COMPARISON BETWEEN SURFACE TEMPERATURE VARIATIONS PREDICTED FROM MASS TRANSFER DATA AND EXPERIMENTAL MEASUREMENTS

Get access (open in a dialog) DOI: 10.1615/IHTC7.2640
pages 457-461

Abstrakt

Mass transfer techniques are used to estimate variations in heat transfer coefficient over a surface. Such variations may arise from changes in surface geometry, an impinging flow, or an adjacent feature disturbing otherwise uniform flow. The measurements permit estimates to be made of associated hotspots or coldspots which could affect surface endurance. A mass transfer technique does not always simulate convective heat transfer accurately because some of the modelling laws either cannot, or may not, be strictly satisfied. The accuracy of hotspots deduced using a particular mass transfer technique has been investigated by comparing temperature predictions based on mass transfer data for an unheated test section with temperature measurements made when the same test section was electrically heated. The temperature profiles were found to be closely similar with the two hotspots respectively 11.2% and 12.4% of the mean surface to coolant temperature difference.