COMPARISON OF DIFFERENT HEATING METHODS FOR THE TEMPERATURE-CONTROLLED MEASUREMENT OF CONVECTIVE TRANSITION BOILING

Abstract

For the experimental investigation of the transition boiling regime, special heating and control methods have to be introduced to ensure stability, typical problems of all these methods are the large axial temperature gradient after the transition boiling mode first appears on the heat transfer surface and the failure of stability under some conditions. Through numerical solution of the heat conduction problem related to the temperature-controlled test section, which has a strongly nonlinear boiling topography as one of its boundary conditions, different types of heating methods can be compared in terms of axial temperature gradient, extension of the transition boiling mode, and the second-order instability.