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Heat and Mass Transfer

Turbulent Heat and Mass Transfer Across a Hollow Fiber Membrane Tube Bank in Liquid Desiccant Air Dehumidification

[+] Author and Article Information
Si-Min Huang

Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China; State Key Laboratory of Subtropical Building Science,  South China University of Technology, Guangzhou 510640, China

Li-Zhi Zhang1

Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China; State Key Laboratory of Subtropical Building Science,  South China University of Technology, Guangzhou 510640, ChinaLzzhang@scut.edu.cn

Kai Tang, Li-Xia Pei

Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering,  South China University of Technology, Guangzhou 510640, China

1

Corresponding author.

J. Heat Transfer 134(8), 082001 (May 29, 2012) (10 pages) doi:10.1115/1.4006208 History: Received June 27, 2011; Revised February 03, 2012; Published May 29, 2012; Online May 29, 2012

The fluid flow and conjugate heat and mass transfer across a hollow fiber membrane tube bundle used for liquid desiccant air dehumidification are investigated. In this process, humid air flows across the fiber bank and salt solution flows inside the fibers packed in a shell. They exchange heat and moisture through the membranes. To overcome the difficulties in the direct modeling of the whole tube bundle, a representative cell, which comprises of a single fiber, a solution stream inside the fiber, and an air stream flowing across the fiber, is selected as the calculation domain. The liquid flow inside the fibers is assumed to be laminar due to the low Reynolds numbers, while the air flow across the bank is considered to be turbulent as a result from the disturbances from the numerous fibers. The governing equations for fluid flow and heat and mass transfer in the two flows and in the membrane are coupled together and solved numerically with a self-built code. Experimental work on hollow fiber membrane-based liquid desiccant air dehumidification is performed to validate the model. The fundamental data on friction factor, Nusselt and Sherwood numbers on both the shell and the tube sides are then obtained for Re = 300–600.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a cross-flow hollow fiber membrane contactor for liquid desiccant air dehumidification. (a) The shell and the tube structure; (b) a free surface cell in the bundle.

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Figure 2

The coordinate system of the calculated unite cell: (a) the three-dimensional coordinate system; (b) the physical plane; and (c) the computational plane

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Figure 3

Time dependency of three velocity components for Vai  = 3.0 m/s, Rea  = 280

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Figure 4

Overall mean Nusselt and Sherwood numbers for the two streams, and the total drag coefficient for the air stream at ϕ =  0.265. Solid and dashed lines represent the data obtained by the low-Re k-ɛ and laminar models, respectively. The discrete points are the measured values.

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Figure 5

Variations of the angularly local Nusselt and Sherwood numbers for the air flow along the main flow direction under different Reynolds numbers, ϕ = 0.265

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