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http://dx.doi.org/10.5916/jkosme.2010.34.2.235

A Study on the Effect of Scale Roughness attached Surface of Heat Exchangers  

Kim, Min-Soo (전북대학교 기계설계공학부)
Choi, Nag-Jung (전북대학교 기계설계공학부)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.34, no.2, 2010 , pp. 235-242 More about this Journal
Abstract
An experimental investigation has been conducted to clarify roughness effects of geothermal water scale deposited onto a heating surface upon its forced convection heat transfer characteristics. Examined was a circular cylinder, on which particles of silica scale having five different sizes are uniformly distributed. The Reynolds number was varied from 13000 through 50000. Local and mean heat transfer characteristics were measured as functions of particle size and Reynolds number. Subsequently the mean fouling resistance was estimated from those results, and its characteristics are clarified. It was found that the heat transfer of cylinders greatly varies with the fouling of geothermal water scale, especially its scale height. Further, the local and average Nusselt numbers strongly depend upon the cylinder spacing and the Reynolds number.
Keywords
Roughness effect; Geothermal water scale; Heat exchanger; Separation point Stagnation point; Fouling resistance;
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  • Reference
1 Z.G.Kostic and S.N.Oka, "Fluid flow and heat transfer with two cylinders in cross flow", Int. J.Mass Trans. vol. 15, pp. 279-299, 1972.   DOI   ScienceOn
2 Munehiko HIWADA, Ikuo MABUCHI and Hideaki YANAGIHARA, "Fluid flow and heat transfer of two circular cylinder with same diameter", JSME B, vol.48, no.427, pp. 499-508, 1983.
3 Shinya AIBA, Hajime TSUCHIDA and Terukazu OTA, "Heat transfer around a tube in a bank", JSME, vol.23, no.181, pp. 1163-1170, 1980.   DOI   ScienceOn
4 石谷, 西川, "圓管群に 直交する管外流れの構造 に關する硏究", 機論, 40-337, pp. 2599-2608, 1975.
5 Tamotsu IGARASHI, "Characteristics of the Flow around Four Circular Cylinders", JSME B, vol.51, no.467, pp. 2061-2067,1986.
6 Tetsushi NAKAI, Kyozo AYUKAWA and Tsutomu INOUE, "Cross flow through in closely arranged circular cylinders", JSME B, vol.62, no.593, pp.65-71, 1996.   DOI
7 Ralph L. Webb, Principles of Enhanced Heat Transfer, A Wiley-Interscience Publication, 1993.
8 Bott.T.R, Fouling of Heat Exchangers, Elsevier, 1995.
9 Melo.L.F. Bott.T.R and Bernardo.C.A, Fouling Science and Technology, Kluwer Academic Publisher, 1988.