UM  > Faculty of Science and Technology  > DEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Experimental Investigation Of The Single-Phase Friction Factor And Heat Transfer Inside The Horizontal Internally Micro-Fin Tubes In The Transition Region
Hou Kuan Tam1; Lap Mou Tam1; Afshin J. Ghajar2; Cheong Sun1; Hau Yin Leung1
2011
Conference NameProceedings of ASME-JSME-KSME Joint Fluids Engineering Conference 2011
Source PublicationProceedings of ASME-JSME-KSME Joint Fluids Engineering Conference 2011
Conference DateJuly 24-29, 2011
Conference PlaceHamamatsu, Shizuoka, JAPAN
Abstract

To increase heat transfer, internally micro-fin tubes are widely used in commercial HVAC applications. It is commonly understood that the micro-fin enhances heat transfer but at the same time increases the pressure drop as well. In the previous studies, majority of the works were focused on the development of correlations in a particular flow regime, especially in the turbulent region. There are only a few works that fundamentally studied the continuous change in the characteristic behavior of pressure drop and heat transfer from laminar to transition and eventually the turbulent regions. Therefore, more in-depth study is necessary. In this study, pressure drop and heat transfer were measured simultaneously in a single test section fitted with several micro-fin tubes and the measured data was compared with the data of a plain tube. There were different fin geometries (fin spiral angle, fin height, and number of fins per cross-sectional area) inside the micro-fin tubes. From the friction factor results, the transition from laminar to turbulent was clearly established and shown to be inlet dependent. The transition friction factor characteristic for the micro-fin tubes was different from that of the plain tube. The transition range for the micro-fin tubes was shown to be much wider than that of the plain tube. From the experimental results, it could also be observed that the increase of fin spiral angle lead to the early transition for the friction factor. For the heating condition, the effect of heating on the friction factor was observed primarily in the lower transition region. From the heat transfer results, the transition from laminar to turbulent was clearly established and shown to be inlet and spiral angle dependent. The larger spiral angle caused the earlier transition and the higher heat transfer inside the micro-fin tube. For all the micro-fin tubes with two inlet types, it can be observed that the efficiency index is larger than one when Reynolds number is larger than 5,000.

KeywordFriction Factor Transition Region Micro-fin Tubes Heat Transfer
DOIhttp://doi.org/10.1115/AJK2011-16026
URLView the original
Language英语
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Document TypeConference paper
CollectionDEPARTMENT OF ELECTROMECHANICAL ENGINEERING
Affiliation1.Department of Electromechanical Engineering, Faculty of Science and Technology, University of Macau, Av. Padre Tomás Pereira, Taipa, Macau, China.
2.School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma, USA.
First Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Hou Kuan Tam,Lap Mou Tam,Afshin J. Ghajar,et al. Experimental Investigation Of The Single-Phase Friction Factor And Heat Transfer Inside The Horizontal Internally Micro-Fin Tubes In The Transition Region[C],2011.
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