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An Experimental Characterization of Automatic Transmission Fluid Flowing Through Air Cooled Microchannel Heat Exchanger
Journal Article
2012-01-1211
ISSN: 1946-3979, e-ISSN: 1946-3987
Sector:
Topic:
Citation:
Quaiyum, M., Fartaj, A., and Askar, S., "An Experimental Characterization of Automatic Transmission Fluid Flowing Through Air Cooled Microchannel Heat Exchanger," SAE Int. J. Mater. Manf. 5(2):503-516, 2012, https://doi.org/10.4271/2012-01-1211.
Language:
English
Abstract:
Narrow-channel Heat Exchangers have received diversified
research and application interests due to the miniaturized
geometry, elevated heat transfer characteristics, and better energy
efficiency. Automatic Transmission Fluid (ATF) cooling is one of
the most important challenges in recent automotive industries due
to the quick response to thermo-physical properties with
temperature variations. Although a wide range of investigation on
characterization of heat transfer and fluid-flow in Minichannel
Heat Exchanger (MICHX) for various fluids is available, literatures
examining ATF heat transfer and Fluidflow behaviors in the MICHX
are scarce. In the current study, attempts have been made to
justify the suitability of MICHX application in cooling of ATF.
Experimental investigations have been conducted in a well-equipped
closed loop integrated thermal wind tunnel test facility using wavy
finned-MCHX as a test specimen. The inlet temperature of the ATF
was maintained at a constant 75°C throughout the experiment. Air
velocities of 6, 10, 14 and 18 m/s were applied. The entering air
temperatures were varied at 15, 22, 29, 36 and 43°C while ATF
Reynolds number was varied from 3.00 to 30.00 within the air
temperature range.
The effects of ATF Reynolds number on heat transfer coefficient,
and Nusselt number, as well as Heat Exchanger effectiveness-NTU for
the air-flow Reynolds number of 1450-5200, were examined. ATF
Nusselt number correlation with Reynolds number and Prandtl number
was established as a power-law function while considering a
variable property ratio. The analysis showed an enhanced result in
heat transfer characterizations and good agreement with established
phenomena of the multi-port Minichannel Heat Exchanges in open
literature.
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