非等温乱流場の熱伝達問題における渦拡散係数について

概要

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The flow in enclosed non-isothermal space such as air-conditioned room is considered desirably as non-isotropic turbulent flow due to gravitational effects. In this case, the Reynolds stresses and the heat flux terms in the transport equations induced by time-mean should be treated as non-isotropical values including buoyant effects of a gravitational field. The approximate method based on the expression by Launder et al is used in the analyses of this paper. Namely, the Reynolds stresses and the heat flux terms are expressed algebraically by the use of buoyant effects in addition to eddy kinematic viscosity and eddy diffusivity of isotropic turbulent flow. In order to investigate the justice of this method, the calculation about free shear flow, jets and turbulent flow in pipe are carried out. The calculated flow velocity and air temperature by three dimensional analyses of finite element method are compared with the measured values in air conditioning chamber of container type.
長崎大学工学部,Faculty of Engineering, Nagasaki Universityの論文