Heat transfer of super gas in narrow annular gap

The heat transfer of supper gas from distilled water at a high temperature in a narrow annular gap with width of 1.0, 1.5 and 2.0 mm has been experimentally investigated. The results indicated that characteristics of the heat transfer in a narrow channel are significantly different from those in the common tube. It was found that the smaller the gap width was, the bigger the heat transfer coefficient was. Using multivariate linear analysis, a heat transfer equation from the experiment results was suggested for engineering application.