Angular dependence of blade for vortex induction in vibrating pipe flow aiming at heat transfer enhancement

Abstract

Experimental investigation was conducted on heat transfer enhancement in a vibrating pipe flow with blades. The test section is located at the end of a larger pipe to simulate a transition from turbulent to laminar flow as a consequence of a sudden change of the diameter. The friction drag coefficient C_f, which correlates with the heat transfer, is estimated by differential pressure measurement. The test section has blades inside the pipe to induce the secondary flow by the vibration control. The parametric study of the present experiment focused on blade angle. As a result, the rate of increase in C_f increased by decreasing blade angle.