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Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Volumes per year:

various

Year 2006

DOI: 10.1615/IHTC13.p5

HEAT TRANSFER CHARACTERISTICS IN A CAVITY WITH VISCO-ELASTIC HYDRATE PARTICLE SLURRIES

R. Nakamura
Kobe University, Japan

H. Suzuki
Graduate School of Science and Technology, Kobe University, Kobe, Japan

S. Yamada
Kobe University, Japan

Y. S. Indartono
Kobe University, Japan

Y. Komoda
Department of Chemical Science and Engineering, Kobe University, Kobe, Japan

H. Usui
Department of Chemical Science and Engineering, Kobe University, Kobe, Japan

ABSTRACT

A two dimensional numerical study has been performed to investigate on heat transfer of hydrate slurry transported by a visco-elastic fluid in a cavity. In the present study, the effects on the cavity streamwise length, L [m] were concerned, while the cavity depth (rib height), H[m], is kept constant at 0.02 m. The cavity length was changed in three steps; L/H=2.5, 5 and 10. Heat flux on the solid wall was set at 20,000 W·m⁻². Reynolds number and Weissenberg number is 100 and 0.025, respectively. The concentration of hydrate particles at inlet was set at 5mass%. From the results, it is found that hydrate particles dispersed with Newtonian fluid (water) flow over the cavity without penetration. On the other hand, hydrate particles dispersed with visco-elastic fluid are observed effectively to penetrate into the cavity and sweep the bottom of cavity by Barus effect. Though the local heat transfer coefficient decreases in the downstream region of the cavity due to the development of thermal boundary layer, the mean Nusselt number on the cavity bottom in this visco-elastic dispersion medium cases becomes higher than that for water cases in corresponding cavity length. It was also found that heat transfer characteristics were significantly affected by cavity length for both dispersion medium cases. It is concluded that the viscoelastic dispersion medium causes effective heat transfer improvement in a cavity and that there exists the optimum geometry for the heat transfer augmentation in a cavity by using Barus effect.