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http://dx.doi.org/10.5916/jkosme.2012.36.1.57

Numerical Study on Heat Transfer and Pressure Drop Characteristics in a Horizontal Channel with Dimple and Protrusion Arrays  

Kim, Ji-Hoon (동의대학교 대학원)
Heo, Joo-Nyoung (동의대학교 대학원)
Shin, Jee-Young (동의대학교 기계공학과)
Son, Young-Seok (동의대학교 기계공학과)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.36, no.1, 2012 , pp. 57-63 More about this Journal
Abstract
In this study, numerical analyses were performed on pressure drop and heat transfer characteristics in a rectangular horizontal channel with dimple and protrusion arrays of different height. The dimples/protrusions were installed at both top and bottom walls of the rectangular channel. The dimple and protrusion depths are 0.125, 0.2, 0.25, 0.3, and 0.375 times diameter. In case of the dimple, the highest Nusselt number occurred at the rear side of the dimple, and the average Nusselt number tended to decrease slightly with increase of depth. In case of protrusion, on the other hand, the highest Nusselt number occurred at the front side of the protrusion, and the average Nusselt number was increased with the increase of height. In both dimple and protrusion, the average Nusselt number and pressure drop were increased with the increase of velocity. Performance factor was decreased with the increase of velocity, and it was found that the best performance factor was obtained in the low velocity region.
Keywords
Dimple; Protrusion; Pressure drop; Heat transfer characteristics; Performance factor;
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