A method for measuring steady local heat transfer to an impinging liquid jet

A new apparatus has been developed to measure local convection coefficients for heat transfer to an impinging liquid jet. The heater and measurement systems and the data reduction procedure are described. Heat fluxes of 0.25–2.5 MW/m2 were delivered to a 119 × 35.7 mm surface by passing an electric current through a thin metal plate. The temperature and heat flux distributions at the jet-surface interface were computed from temperatures measured at 5.1 mm intervals on the opposite side of the heater. The apparatus is unique in that heat fluxes sufficient to induce steady convective boiling were delivered to an area large enough to accomodate local measurements in both the jet impingement and parallel flow regions. This paper emphasizes the experimental method, including a discussion of uncertainties, and selected results are presented to show that the methodology is viable.