The Effect of Buoyancy on Laminar Flow and Heat Transfer in Pipes

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概要

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• Buoyancy-induced secondary flows in a heated pipe rotating about a parallel axis are similar to those in a stationary horizontal heated pipe. The effect of buoyancy on fully developed laminar flows and heat transfer in rotating pipes and in horizontal pipes is studied by similarity analysis and computations. The similarity analysis reveals that the flows are characterized by a new fundamental parameter, K_<LB>, and the Prandtl number, Pr;K_<LB>plays a role of Peclet number in the cross-section and Pr determines the sensitivity of the axial primary flow to secondary flow. Heat transfer is basically independent of Pr. Based on the dimensionless governing equations, limiting behaviours of velocity and temperature fields are discussed. Similarity conclusions are supported by computational results of contours of velocity and temperature, the friction factor and heat transfer rate. Semi-empirical formulae for the friction factor and the Nusselt number are presented.

• 一般社団法人日本機械学会の論文
• 1997-05-15

著者

• Ishigaki H

  National Aerospace Lab. Miyagi Jpn

• ISHIGAKI Hiroshi

  Kakuda Research Center, National Aerospace Laboratory

• Ishigaki Hiroshi

  Kakuda Research Center National Aerospace Laboratory

関連論文

• The Effect of Buoyancy on Laminar Flow and Heat Transfer in Pipes
• Analogy of Forced Convective Heat Transfer between Laminar Flows in Curved Pipes and Orthogonally Rotating Pipes
• Analogy between Developing Laminar Flows in Curved Pipes and Orthogonally Rotating Pipes
• Laminar Convective Heat Transfer in Rotating Curved Pipes

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