船舶艤装における熱伝達問題の解析 : その2 : 浮力の影響がある場合

概要

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Slow speed air flow in an air conditioned cabin is investigated in the light of non-isotropic turbulent flow subjected to gravitational effect. The terms of Reynolds stress and turbulent heat flux appeared in the time averaged transport equations should be treated taking into account of non-isotropic turbulence in this case. Using approximate equations presented by Launder et al^<1),2)>, Reynolds stress and turbulent heat flux terms considering buoyant effect are assumed to be able to be algebraically superposed that effect on eddy kinematic viscosity and eddy diffusivity of isotropic turbulent flow^<3)>. Flow velocity and air temperature in an air conditioned chamber of container type are measured experimentally to investigate the distributions of isothermal zone and heat convecting zone. Further, three dimensional analyses of heat convection by finite element method are carried out for the models of air conditioned chamber used for measurements and the result of theory and experiment are compared. The relations between Archimedes number and buoyant effect to turbulent flow in air conditioned chamber are clarified which are useful for the air conditioning design.
社団法人日本船舶海洋工学会の論文