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Heat Transfer Research
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ISSN Imprimer: 1064-2285
ISSN En ligne: 2162-6561

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Heat Transfer Research

DOI: 10.1615/HeatTransRes.2019029768
pages 41-56

EFFECTS OF COOLING TUBES ON CONJUGATE HEAT AND MASS TRANSFER IN A HEXAGONAL PARALLEL-PLATE MEMBRANE CHANNEL

Si-Min Huang
Key Laboratory of Distributed Energy Systems of Guangdong Province, Department of Energy and Chemical Engineering, Dongguan University of Technology, Dongguan 523808, People's Republic of China
Dai-Wei Du
Guangdong Provincal Key Laboratory of Distributed Energy Systems, Dongguan University of Technology, Dongguan 523808, China
Liehui Xiao
Guangdong Provincal Key Laboratory of Distributed Energy Systems, Dongguan University of Technology, Dongguan 523808, China
Wu-Zhi Yuan
Guangdong Provincal Key Laboratory of Distributed Energy Systems, Dongguan University of Technology, Dongguan 523808, China
Bing Hu
Guangdong Provincal Key Laboratory of Distributed Energy Systems, Dongguan University of Technology, Dongguan 523808, China
Shimin Kang
Guangdong Provincal Key Laboratory of Distributed Energy Systems, Dongguan University of Technology, Dongguan 523808, China

RÉSUMÉ

An internally cooled hexagonal parallel-plate membrane contactor is developed and used to study the conjugate heat and mass transfer under the effects of cooling tubes. The contactor is comprised of a series of internally cooled hexagonal parallel-plate membrane channels (IHPMC). A mathematical model is established in a unit cell including a hexagonal plate membrane, an adjacent air channel and a solution (liquid desiccant) channel with several cooling tubes. The air and the solution streams are in an arrangement combined with counterflow and crossflow. The cooling tubes are installed in the solution side, while the water flows in the counterflow arrangement to take away the sensible heat of the solution generated by absorbing the water vapor. The partial differential equations for describing the fluid flow and heat and mass transfer are established and numerically solved. The friction factors, Nusselt numbers, and Sherwood numbers are then obtained and analyzed. Influences of the tube number Ntube, tube outer diameters douter, and Reynolds numbers Re on the IHPMC under the conjugate heat and mass transfer boundary conditions are investigated. It can be found that the tube numbers and the tube outer diameters have negligible influences on the mean Nusselt numbers and the Sherwood numbers for the air stream, while their effects on the solution are large. The friction factors and the Nusselt numbers for the water stream are nearly independent of the various tubes inside the solution channels.

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