Comparison of the 1D and 2D calculation models used for determination of the heat transfer coefficient during flow boiling heat transfer in a minichannel

¹ Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology Al. 1000-lecia P.P. 7, 25-314 Kielce, Poland
² Faculty of Mechatronics and Mechanical Engineering, Kielce University of Technology Al. 1000-lecia P.P. 7, 25-314 Kielce, Poland
³ Faculty of Management and Computer Modelling, Kielce University of Technology Al. 1000-lecia P.P. 7, 25-314 Kielce, Poland

^* Corresponding author: kzietala@tu.kielce.pl

Abstract

The paper discusses the results of the flow boiling heat transfer in a vertical minichannel with rectangular cross-section. The heating element for FC-72 flowing in the minichannel is a thin plate. Infrared thermography is used to determine changes in the temperature on its outer side. The aim of thecalculation is to determine the heat transfer coefficient using 1D and 2D calculation models. Local values of heat transfer coefficient on the surface between the heated plate and boiling fluid are calculated from the Newton`s and Fourier`s laws. In 2D model the plate temperature distribution is obtained by solving the inverse heat conduction problem. The governing equation is solved by means of two methods: the non-continuous Trefftz method and the Beck method. The results are presented as plate temperature and heat transfer coefficient calculated using 1D and 2D models as a function of the distance fromthe minichannel inlet. The analysis of the results revealed that the values and distributions of the heat transfer coefficient calculated by means of both models were similar. This suggests that all mentioned methods are interchangeable.