Effect of Vibration on Heat Transfer From a Wire to Air in Parallel Flow

Abstract

Abstract Studies on the effect of vibration of the heat-transferring surface on convective heat transfer are few and limited to natural-convection conditions. The present investigation deals with the influence of vibration on heat transfer from an electrically heated nichrome wire to parallel air streams. Air velocities ranged from 34 to 63 fps. At each air velocity, frequencies ranging from 75 to 120 cycles per second and different amplitudes were employed as vibrational variables. Both frequency and amplitude increased the heat-transfer coefficient. An increase as high as 130 per cent was obtained. The correlation of the experimental data shows that the proportional increase in heat transfer was controlled by the ratio of the mean vibrational velocity to the air-stream velocity.