The effect of variable viscosity on laminar flow and heat transfer in rectangular ducts.
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概要
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Numerical solutions are presented for the flow and heat transfer problems of laminar forced convection for liquids in rectangular ducts by use of several correlative equations for viscosity-temperature as used in the studies of the circular tube, where the fully developed velocity and temperature fields, under the boundary conditions of axially uniform wall heat flux and peripherally uniform wall temperature, are assumed. The effects of viscosity variations on the profiles of velocity and temperature, the friction factor and the Nusselt number are summarized as follows: i) the velocity profile is strongly affected by the viscosity ratio based on the wall and cup mixing temperature (μw/μm), whereas the temperature profile is affected weakly, and ii) the relationship of f/fcp vs. μw/μm for various aspect ratios is in good agreement with that of the circular tube as reported by Shannon et al. and Deissler, in the region of μw/μm<10 where fcp is the friction factor for the case of constant viscosity. On the other hand, the relationship of Nu/Nucp vs. μw/μm is different from that of the circular tube, except in the region where μw/μm is closer to unity, and its difference is remarkable in a larger aspect ratio.
- 公益社団法人 化学工学会の論文
著者
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HIRAOKA Setsuro
Department of Applied Chemistry, Nagoya Institute of Technology
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Yamada Ikuho
Department Of Applied Chemistry Nagoya Insitute Of Technology
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Nakamura Hajime
Department Of Biological Responses Institute For Virus Research Kyoto University
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Matsuura Akihiro
Department Of Animal Science School Of Veterinary Medicine Kitasato University
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KIWAKI JUMEI
Department of Mechanical Engineering, Daido Institute of Technology
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MATSUDA NOBUO
Department of Industrial Chemistry, Nagoya Institute of Technology
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