Journal of Enhanced Heat Transfer Theory and Application in High Performance Heat and Mass Transfer

ISSN for PRINT: 1065-5131

For Online Access

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2003, Volume10

Issue 3

102 pages

DOI: 10.1615/JEnhHeatTransf.v10.i3

Issue price - $138.00

Kimitoshi Sato
Hiroshima Institute of Technology, 1-2-2 Miyake, Saeki-ku, Hiroshima 731-5193, Japan

Rencai Chu
Komatsu Ltd., 1200 Manda, Hiratsuka, Kanagawa 254-8567, Japan

Masaya Kumada
Department of Mechanical Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan

Both enhancement of heat transfer and the reduction of pressure loss are important in order to achieve high-performance heat exchangers. In this article, characteristics of fluid flow and heat transfer of a drag-reducing dilute cationic surfactant solution in a channel and a tube are investigated to realize a high heat exchanger. It is attainable for the reduction of the turbulent frictional drag by dilute polymeric and surfactant aqueous solutions. However, many investigations, which are of full drag-reducing flow without disturbance, have shown that heat transfer is reduced simultaneously. In order to recover the reduced heat transfer, the effect of some turbulent promoters and a row of delta-winglets that generate the longitudinal vortices was tested in a two-dimensional channel. Furthermore, an examination of the relation between heat transport and momentum was carried out; it was found that the critical velocity corresponding to the critical Reynolds number at which the drag-reduction effect reaches a maximum value solely depends on the concentration of the surfactant solution.

DOI: 10.1615/JEnhHeatTransf.v10.i3.50 Download article, 301-310 pages

Article price - $35.00

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