Efficient Heat and Mass Transfer Processes (6)

Wednesday August 28, 2019 from 13:30 to 15:10

Room: 520be

TS-315.5 Experimental research and numerical simulation of periodic frost melting progress

Tianwei Lai, People's Republic of China

Associate Professor
Department of Refrigeration and Cryogenic Engineering
Xi'an Jiaotong University


Experimental Research and Numerical Simulation of Periodic Frost Melting Progress

Zheng Ren1, Xingqun Zhang1, Xiaojun Dong1, Beile Zhang2, Xiaozhuan Chen2, Yu Hou1, Tianwei Lai1.

1Xi'an Jiaotong University, Xi'an, People's Republic of China; 2Henan Polytechnic University, Henan, People's Republic of China

 In order to study the frosting characteristics on the surface of the circular pipe below -60 ℃, a test rig for frosting visualization on double-pipe heat exchanger has been built based on cascade refrigeration system. Through a series of systematic experimental studies, it is found that periodic melting phenomenon occurs during the frost development and maturity period. First, the experimental phenomena of frost periodic progress are systematically summarized. Then, the melting criterion is added to the mathematical model of unsteady frosting on the surface of circular pipe by numerical method. The cycle of frosting and melting is simulated. The simulated results are similar to the experimental results, which shows that the model can accurately predict the melting process. The results show that the higher the humid air temperature is, the earlier the melting node appears; since the first melting phenomenon occurs, the interval of each melting phenomenon becomes longer.

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