A New Electromagnetic Heating Method to Study Spray Cooling

Abstract

AbstractThis work shows measured heat fluxes that are removed by air-mist jets under steady-state conditions from different metallic surfaces at temperatures up to 1,200°C. A sample disk is subjected simultaneously to induction heating and spray cooling. In order to reach a set-point temperature for the disk, a digital controller adjusts the power delivered by a 5 kW high-frequency generator to compensate the heat removed by the spray. The heat flux removed by the impinging jet is determined from the measured values of coil current and disk temperature, and from the coupled numerical solution of the Maxwell’s equations together with the heat conduction equation. This method determines heat fluxes within 10% uncertainty. The obtained boiling curves for Pt, Ni and Inconel show that heat flux is described by a single curve in the stable film boiling regime for these metals.