Numerical and Experimental Study on Heat Transfer Characteristics of Single Vibrating Blade in a Channel Flow

The heat transfer characteristics of the vibrating blades of different shapes were numerically modeled in the present work. A single blade was arranged in a channel with vertical or horizontal alignment. Both the static environment and the channel flow were considered. Four types of blades, rectangular, trapezoidal, serrated, and folding, were comparably modeled. The results showed that the vibrating blade could effectively enhance the convection heat transfer of the heated surface with a smaller increase of pressure drop. For the static environment, the heat transfer performance of the vertical alignment of the blade is better than the horizontal alignment. For channel flow, the opposite conclusion is obtained. For the inlet velocity of channel flow v(inlet)=2 m/s and v(inlet)=6 m/s, the maximum improvement of the local convection heat transfer coefficient is about 98% and 12%, respectively. The corresponding pressure drops were reduced and increased by 9.5% and 8.8%, respectively. The vibrating blade can effectively improve the convection heat transfer at lower inlet velocity. Under the same working conditions, the pressure drop difference between the four shapes of fan blades is less than 1%, and the folding blade has the best local heat dissipation performance.