چکیده :
The longitudinal fluid flow and heat transfer between an elliptical hollow fiber membrane tube bank
(EHFMTB) used for air humidification are investigated. In the tube bank, the water stream flows inside
the fibers, while the air stream flows axially between the fibers. The air and the water streams, in a counter
flow arrangement, are exchanging heat and moisture effectively through the membranes. Two regularly
populated arrangements of the tube bank, in-line and staggered, are considered. Two representative
unit cells consisting of two fibers and the air stream flowing longitudinally between the fibers are
selected as the calculation domains. The governing equations for the fluid flow and the heat transfer
between the EHFMTB are established and numerically solved via a boundary-fitted coordinate transformation
method. The friction factor and Nusselt number in the unit cells are then obtained, analyzed, and
experimentally validated. They are compared with the data obtained for a hollow fiber membrane tube
bank (HFMTB). The results are useful for structural optimization and performance evaluations of the
EHFMTB employed for air humidification.
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