Numerical Study on Heat and Mass Transfer of Evaporated Binary Zeotropic Mixtures in Porous Structure

Bo Zhang, Peilin Cui, Zhiguo Wang, Zhiwei Sun, Bo Kong, Wei Wang, Wen Du, Ping Huang, Zhenhai Pan and Zhenyu Liu ()
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Bo Zhang: Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410007, China
Peilin Cui: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Zhiguo Wang: Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410007, China
Zhiwei Sun: Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410007, China
Bo Kong: Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410007, China
Wei Wang: Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410007, China
Wen Du: Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410007, China
Ping Huang: Technology Center, China Tobacco Hunan Industrial Co., Ltd., Changsha 410007, China
Zhenhai Pan: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Zhenyu Liu: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Energies, 2023, vol. 16, issue 18, 1-15

Abstract: This study investigates the heat and mass transfer characteristics of a binary mixture (R134a/R245fa) evaporated in a porous medium. The Eulerian model coupled with the multiphase VOF model and species transport equations is employed to establish a multi-component evaporation model. The effects of heat flux ranging from 200 kW/m 2 to 500 kW/m 2 , porosity ranging from 0.4 to 0.6, and mass fraction ratios (R134a/R245fa) of 3:7, 5:5, and 7:3 are explored. The results indicate that an increase in heat flux contributes to an increase in the evaporation rate. For the overall evaporation rate, the evaporation rates of R134a and R245fa improve by 11.3%, 6.9%, and 16.3%, respectively, while the maximum improvement in heat transfer coefficient is only 1.4%. The maximum evaporation rate is achieved at intermediate porosity in the porous medium, and the highest heat transfer coefficient is obtained at a porosity of 0.4. With the increase in mass fraction, the evaporation rate of the corresponding species also increases, while the overall evaporation rate and heat transfer coefficient remain almost unchanged.

Keywords: binary zeotropic mixture; species transport; evaporation heat transfer; porous medium (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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