Abstract
Thermal boundary layer in the corner of wall should be taken into account for the accurate calculation of heat transmission through the corner of the wall. However, most studies on thermal boundary layer have treated with flat wall, whether horizontal, vertical, or, oblique. Thus, little research has been conducted concerning thermal boundary layer in the corner of wall. The purpose of this paper is to analyze the thermal boundary layer in the corner of two vertical external-angled wall in free convection. Here, thermometry and formulation method of the shape of the thermal boundary layer in the external-angled corner of wall are discussed. Experiment of measuring the temperature of the wall surface by Thermo-Viewer, and the numerical analysis (Finite Element Method) on the same thermal condition as the experiment are conducted to find the empical formula of the thermal boundary layer in the corner of two vertical external-angled wall in free convection. And, the empirical formula of thermal boundary layer in it is proposed. The results confirms that this empirical formula can be applied to the cases where the difference of temperature between wall surface (flat area) and the air is 5℃-15℃.
