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Effect of the size of graded baffles on the performance of channel heat exchangers

ABSTRACT
The baffling technique is well-known for its efficiency in terms of enhancement of heat transfer rates throught channels. However, the baffles insert is accompanied by an increase in the friction factor. This issue remains a great challenge for the designers of heat exchangers. To overcome this issue, we suggest in the present paper a new design of baffles which is here called graded baffle-design. The baffles have an up- or down- graded height along the channel length. This geometry is characterized by two ratios: up-graded baffle ratio and down-graded baffle ratio which are varied from 0 to 0.08. For a range of Reynolds number varying from 104 to 2x104, the turbulent flow and heat transfer characteristics of a heat exchanger channel are numerically studied by the computer code Fluent. The obtained results revealed an enhancement in the thermo-hydraulic performance offered by the new suggested design. For the channel with a down-graded baffle ratio equal to 0.08, the friction factors decreased by 4-8%.
KEYWORDS
PAPER SUBMITTED: 2018-03-26
PAPER REVISED: 2018-09-29
PAPER ACCEPTED: 2018-10-01
PUBLISHED ONLINE: 2018-11-04
DOI REFERENCE: https://doi.org/10.2298/TSCI180326295S
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