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Friction and Heat Transfer Characteristics of Enhanced Tubes with Internal Ribs  

Park Jong Ick (Graduate School of Mechanical Engineering, Kyung Hee University)
Jeong Jinhee (LG Cable Ltd.)
Lee Young-Soo (Korea Institute of Energy Research)
Kang Yong Tae (School of Mechanical and Industrial System Engineering, Kyung Hee University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.4, 2005 , pp. 318-324 More about this Journal
Abstract
The objectives of this paper are to study the heat transfer characteristics on enhanced surfaces, to develop experimental correlations of friction factor and Nusselt number, and to provide a guideline for optimum operation conditions at low temperature boiling for practical refrigeration applications. The working fluid (water, EG $30\%$) flows inside the enhanced tube and R134a boils on the outer surface. Two different types of Turbo-B tubes (Tube I and Tube II) are tested in the present study. The results show that Tube I gives a higher heat transfer coefficient with higher friction factor than Tube II. The present study provided experimental correlations for friction factor and heat transfer coefficient with error bands of ${\pm}5\%\;and\;{\pm}\;15\%$, respectively.
Keywords
roughened surface; friction factor; heat transfer coefficient; similarity function;
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