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Chemcial Industry and Engineering 2022, Vol. 39 Issue (1) :97-105    DOI: 10.13353/j.issn.1004.9533.20210112
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Flow and heat transfer characteristics of falling film outside titanium elliptical tube in LiBr refrigeration evaporator
PENG Deqi1, PU Xingyu1, YU Tianlan2, LI Guang3, WU Shuying1
1. School of Mechanical Engineering, Xiangtan University, Hunan Xiangtan 411105, China;
2. School of Mechanical Engineering, Hunan University of Technology, Hunan Zhuzhou 412007, China;
3. CRRC Zhuzhou Motor Co., Ltd, Hunan Zhuzhou 412000, China

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Abstract In order to improve the corrosion resistance of refrigeration evaporator in LiBr (lithium bromide) central air conditioning system, titanium tube is used instead of copper tube. In addition, an elliptical tube instead of a circular tube is proposed to improve the evaporation efficiency of refrigerant outside the titanium tube. Effect of elliptic coefficient E on flow process, film thickness distribution and heat transfer coefficient of refrigerant outside the titanium tube was studied by numerical simulation. The results show that in the E (elliptic coefficient) range of 1.0—1.7, the average thickness of the liquid film is thinner, the flow velocity of the liquid film is increased, the area of the dry wall is reduced, the heat transfer boundary layer is thinner and the heat transfer effect is improved significantly with the increase of E. Compared with circular tube, when E=1.7, the average thickness of the liquid film is reduced by 26.21%, the flow velocity of the liquid film is increased by 20.81%, the area of the dry wall is reduced by 86.00% and the average heat transfer coefficient outside tube is increased by 8.67%. However, in the E range of 1.8—2.0, the average thickness of the liquid film and the area of dry wall are increased. Therefore, too large elliptic coefficient is not conducive to heat transfer enhancement.
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PENG Deqi
PU Xingyu
YU Tianlan
LI Guang
WU Shuying
Keywordslithium bromide refrigeration;   falling film evaporation;   vapor-liquid two-phase flow;   numerical simulation;   elliptical tube     
Received 2021-01-30;
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PENG Deqi, PU Xingyu, YU Tianlan, LI Guang, WU Shuying.Flow and heat transfer characteristics of falling film outside titanium elliptical tube in LiBr refrigeration evaporator[J]  Chemcial Industry and Engineering, 2022,V39(1): 97-105
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