دراسة عملية لتأثير تغير الموقع لاسطوانة أفقية بالنسبة لجدار عمودي على عملية انتقال الحرارة بالحمل القسري

Abstract

In this research study of heat transfer coefficient for the cylinder placed horizontally and parallel to the wall of the duct, and how to change this factor in the absence and presence of the wall and the presence of the wall and move different distances from the cylinder (x = 5,10,15,20,25mm) and rotate the cylinder in each and two-speed air of distances mentioned web (360) Nos. Reynolds (Re = 43181-13636) and the practical results found that the approach of the wall of the cylinder leads to a narrowing in the airway, this restriction will lead to increased air speed and thereby increase the heat transfer coefficient. The In the case away from the cylinder wall will lead to increase the distance between the wall and the cylinder, thus reducing the air speed and therefore less valuable local heat transfer coefficient. After taking the practical results of local heat transfer coefficient were found for local Nusselt number and compare the practical results of this research with the published research and found good agreement with them.