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An Experimental Study on Laminar Heat Transfer in Flat Aluminum Extruded Tubes Having Small Hydraulic Diameter  

Kim, Nae-Hyun (Department of Mechanical Engineering, University of Incheon)
Ham, Jung-Ho (Department of Mechanical Engineering, University of Incheon)
Kim, Do-Young (Department of Mechanical Engineering, University of Incheon)
Publication Information
International Journal of Air-Conditioning and Refrigeration / v.15, no.2, 2007 , pp. 47-53 More about this Journal
Abstract
Laminar heat transfer experiments were conducted in flat extruded aluminum tubes. Three different flat tubes-two with smooth inner channel, one with micro-finned inner channel-were tested. Smooth tube data were in reasonable agreement with the predictions by simplified theoretical models. The heat transfer coefficients of the micro-fin tube were significantly smaller than those of the smooth tube. The reason was attributed to the decelerating flow in the inter-fin region. Heat transfer correlations were developed from the data.
Keywords
Flat tube; Laminar flow; Heat transfer; Small diameter; Micro-fin;
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