中空矩形物体内外の自然対流シミュレーション : 冷却時における伝熱特性

概要

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In order to keep environment in the air-conditioned room comfortable, it is important to predict air velocity and temperature field as precisely as possible. When walls or windows of a room cannot be assumed to be adiabatic, estimation of the heat transfer through them is one of the essential factors to perform satisfactory air-conditioning design of the room. Numerical simulation of the cooling process of a cubic shell is conducted. The Navier-Stokes equations governing flow field inside and outside the room and the heat conduction equation applying to walls are solved simultaneously, instead of assuming the heat transfer coefficient between the fluid and the solid surface. The computational result is compared with the experimental one. Their results show good agreement with each other; thus the validity of the calculation is confirmed. Characteristics of the heat flux and the heat transfer coefficient are discussed. It is found that the heat flux through sidewalls is larger than the ones through a top or a bottom wall. This is due to the thinner boundary layer at the lower part of sidewalls. The heat transfer coefficient shows the same tendency.
社団法人日本伝熱学会の論文
2007-07-01