关键词: 热虹吸, 蒸发器, 传热模型

Abstract: Two-phase thermosyphon loop heat exchangers are widely used in different industrial fields.The heat transfer simulation is important for design of thermosyphon.However,due to the complexity of boiling heat transfer and two-phase flow,empirical heat transfer models based on experimental data limit the scope of application,with some difficulties in model choice.In this paper,a mathematical distributed parameter model of two-phase thermosyphon loop is established; the datasets consist of 424 two-phase thermosyphon loop experimental data for 4 working fluids from 5 papers.These datasets are used to evaluate 7 widely used transfer models for evaporation.The results show that Kandlikar's flow boiling model and Rahmatollah's model are the best in calculation accuracy; Cooper's pool boiling model gives relatively good agreement with experimental data,indicating that nucleate boiling is the dominant mechanism; flow boiling models of Gungor and Winterton,Liu and Winterton show similar calculation accuracy and the error is acceptable; but Imura's pool boiling model is not suitable for the thermosyphon heat transfer simulation.

Key words: thermosyphon loop, evaporator, heat transfer model