Experimental Study of Mixed and Forced Convection from A Small Heat to Liquid Flow in Vertical Narrow Channels

Measurements were made of heat transfer rates from a small-size heater to liquid flow in vertical narrow channel both for aiding and opposing flow conditions. Heat transfer characteristics of mixed convection were examined in detail. A set of correlations is presented to predict mixed convection heat transfer rates, which may be considerably underestimated if forced convection correlations are used for calculation.