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Flow Observation and Heat Transfer Performance of Viscoelastic Fluid Flow in a Serpentine Channel

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.2580
pages 2492-2503

Kazuya Tatsumi
Department of Mechanical Engineering and Science, Kyoto University, Kyotodaigaku-katsura, Nishikyo-ku, Kyoto 615-8540, Japan; Advanced Research Institute of Fluid Science and Engineering, Kyoto University

O. Nakajima
Department of Mechanical Engineering and Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan

W. Nagasaka
Department of Mechanical Engineering and Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan

Kazuyoshi Nakabe
Department of Mechanical Engineering and Science, Kyoto University; Advanced Research Institute of Fluid Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan

Sinopsis

This paper describes the results of heat transfer, flow visualization and PIV measurements conducted for the viscoelastic fluid flow in a serpentine channel with square cross-section under low Reynolds number conditions. Polyacrylamide water solution was used as viscoelastic fluid, and was compared with the results of Newtonian fluid.In the visualization, flow fluctuations and secondary flows did not appear in the Newtonian fluid case. On the other hand, unsteady flow and longitudinal vortices were observed in the viscoelastic fluid case. The velocity fields showed that large flow fluctuations were generated in the downstream area of the inflection point of the serpentine channel. Single or a pair of longitudinal vortices was generated in this area. The generation of these vortices can be attributed to the normal stress produced by the viscoelasticity of the fluid and the curvature of the channel. Considerable enhancement of heat transfer performance was obtained by the flow fluctuation and longitudinal vortices.

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