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.