Study On The Working Performance Of Built-In Miniature Hydraulic Turbine Heat Exchanger Tube

This paper introduces the present research situation in foul removing/preventing technologies of heat exchanger. The construction of the miniature hydraulic turbine inside tube, its operating principle in automatically removing and preventing fouling and enhancing heat transfer are introduced. Without the external force, the hydraulic turbine works itself while the fluid flow in the tube. As the insert continuously scrub the heat exchanger tube, it is hard to form the new foul. Furthermore, the hydraulic turbine disturb the boundary layer effectively, so it can realize the foul removing/preventing on line, constantly and automatically.Based on the former work, this paper keep on studying the working performance of built-in miniature hydraulic turbine heat exchanger tube, including the heat exchange performance of the miniature hydraulic turbine. Besides, the foul removing tests are also introduced. The results of the experiments show that the relation between the velocity of flow and the rotational speed of the miniature hydraulic turbine is approximating linear. The hydraulic turbine has big operated elasticity and small fluid resistance, it can satisfy the requirement of flow and resistance of the heat exchanger. And the heat transfer experiments show that the total heat transfer coefficient K is increased when the miniature hydraulic turbine is fixed in the heat exchange tube in the same Reynolds number, and the increasing ratio of the total heat transfer coefficient is between 24.15 % -46.81 %. Further, the value of is bigger than 1 which also prove the hydraulic turbine can achieve a high efficiency of heat transfer. Moreover, the results also prove that the hydraulic turbine can remove the foul constantly and automatically. These experiments all can prove that the working performance of built-in miniature hydraulic turbine heat exchanger tube is well.At the same time, using the method of Wilson, this paper confirm the value of C and P of the relating equation of the convection heat transfer coefficient in the heat exchanger tube with miniature hydraulic turbine and without insert.