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AIR-SIDE HEAT TRANSFER AND PRESSURE DROP FOR ELLIPTICAL TUBES WITH MODIFIED FINS IN A CONFINED CHANNEL
Kieran J. Wolk
University of California, Los Angeles, Mechanical and Aerospace Engineering
Department, Los Angeles, CA 90095
Vijay K. Dhir
Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, California 90095, USA
The effect of dimples on fins, fin thickness, and fin height on air-side heat transfer enhancement and pumping power penalty has been evaluated for elliptical tube cross-flow heat exchangers. Experiments were conducted using a confined channel without bypass flow at superficial air velocities ranging from approximately 0.6 to 5 m/s. Results of dimpled fins were compared to plain fins of two different heights and thicknesses. Wavy fins were also investigated and compared to plain fins. Conical dimples on thick tall fins enhanced the heat transfer coefficient on the air side with little increase in pressure drop across the tube. For shorter, thinner fins, geometrical modifications such as
wavy fins and longer flow path lengths did not increase heat transfer coefficient but led to increased pressure drop.
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