Numerical and experimental study on the falling film flow characteristics with the effect of co-current gas flow in hydrogen liquefaction process  

作　　者：Chong-Zheng Sun Yu-Xing Li Hui Han Xiao-Yi Geng Xiao Lu 

机构地区：[1]College of Energy Storage Technology,Shandong University of Science and Technology,Qingdao 266590,Shandong,China [2]College of Pipeline and Civil Engineering/Shandong Provincial Key Laboratory of Oil&Gas Storage and Transportation Safety,China University of Petroleum,Qingdao 266580,Shandong,China

出　　处：《Petroleum Science》2024年第2期1369-1384,共16页石油科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52304067,62273213);the Natural Science Foundation of Shandong Province of China(ZR2021QE073);the Natural Science Foundation of Shandong Province for Innovation and Development Joint Funds(ZR2022LZH001);the China Postdoctoral Science Foundation(2023M732111)。

摘　　要：Liquid hydrogen storage and transportation is an effective method for large-scale transportation and utilization of hydrogen energy. Revealing the flow mechanism of cryogenic working fluid is the key to optimize heat exchanger structure and hydrogen liquefaction process(LH2). The methods of cryogenic visualization experiment, theoretical analysis and numerical simulation are conducted to study the falling film flow characteristics with the effect of co-current gas flow in LH2spiral wound heat exchanger.The results show that the flow rate of mixed refrigerant has a great influence on liquid film spreading process, falling film flow pattern and heat transfer performance. The liquid film of LH2mixed refrigerant with column flow pattern can not uniformly and completely cover the tube wall surface. As liquid flow rate increases, the falling film flow pattern evolves into sheet-column flow and sheet flow, and liquid film completely covers the surface of tube wall. With the increase of shear effect of gas-phase mixed refrigerant in the same direction, the liquid film gradually becomes unstable, and the flow pattern eventually evolves into a mist flow.

关 键 词：Hydrogen liquefaction Spiral wound heat exchanger Flow pattern transition Falling film flow 

分 类 号：TK91[动力工程及工程热物理]