Abstract
Experiments with a temperature controlled system were performed to study the critical heat flux (CHF) on a small circular heater surface (1cm2) in natural and jet impingement cooling. As test fluid the Fluorinert FC72 was used. In pool boiling experiments the effects of saturation conditions, the orientation of the heater surface and of heater sidewalls on the CHF-point were studied. The jet impingement experiments were performed with free jets of different temperatures, nozzle exit velocities and heater / nozzle distances for a nozzle with 1mm diameter. In both cases boiling curves were obtained showing presicely the heat flux and the heating surface temperature at CHF.
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