Combined Free and Forced-Convection Heat-Transfer for Fully-Developed Laminar Flow in Horizontal Tubes (Experiments)

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概要

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• Experimental investigations have been made of the forced-convection heat-transfer for a fully developed laminar flow in horizontal circular tubes and concentric annuli in order to clarify quantitatively the effect of natural convection on their heat-transfer characteristics. When the Grashof number Gr=βgLrTr/Ur^2, defined using Tr=WGLr^2/α, Lr=(d^2_2-d^2_1)(q_1+q_2)/(d_1q_1+d_2q_2), Ur= ν/Lr as the characteristic temperature, length, and velocity, respectively, is introduced, the heat-transfer characteristics of the secondary flows induced by natural convection can be expressed by the following equations; for inner tubes, Nui=0.44Gr^<0.20>Pr^<0.28>(d_2/d_1)^<0.35> for outer tubes, Nuo=0.38Gr^<0.20>Pr^<0.28> These two equations are applicable to circular tubes and annuli, regardless of heating amounts of inner and outer tubes.

著者

• HATTORI Naozo

  Senior Researcher Oarai Engineering Center, Power Reactor and Nuclear Fuel Development Corporation

• KOTAKE Susumu

  Associate Professor Institute of Space and Aeronautical Science, University of Tokyo

• Hattori Naozo

  Senior Researcher Oarai Engineering Center Power Reactor And Nuclear Fuel Development Corporation

• Kotake Susumu

  Associate Professor Institute Of Space And Aeronautical Science University Of Tokyo

関連論文

• Combined Free and Forced-Convection Heat-Transfer for Fully-Developed Laminar Flow in Horizontal Tubes (Experiments)

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