Scaling method of heat transfer deterioration under the conditions of supercritical pressures

• 1、School of Energy and Power Engineering, Shandong University, Jinan 250061

Abstract：Under the conditions of supercritical pressures, fluid to fluid modeling method using low latent heat of organic fluid on the critical heat flux (criticalheatflux, CHF) was studied, in order to expand the scope of fluid modeling technology, and improve the prediction accuracy of the objective. This paper takes the R134a as the medium of supercritical conditions on flow boiling CHF studied fluid model, analyzing the flow characteristics of supercritical CHF, the selection of supercritical pressure modeling criterion and the model validation etc. Based on the Ahmad distortion compensation model and Katto model, with velocity model factor and scale factor of the entrance conditions, the pressure scale factor correction was introduced to improve and develop new fluid modeling model of supercritical conditions. The CHF data collection and boiling CHF model based on R134a data were compared. The results show that most of the data falls in the range of ±20%, with a good prediction accuracy in the current range of conditons.

Keywords： thermal engineering critical heat flux supercritical pressures fluid to fluid modeling