Simulation on Heat Transfer Enhancement Characteristics of Inserted Multi-helical Spring

Ma Yuxiang, Liu Yongqi, Sun Peng

enhanced heat transfer, heat exchange tube, numerical analysis, spring number

In order to enhance the heat exchange effect of spring heat exchange tube, based on the traditional helical spring heat exchange tube, a new type of helical spring heat exchange tube was developed by changing the spring section into a square and contacting the spring with the inner wall of the heat exchange tube. The helical spring heat exchange tube was simulated by Fluent software, the influence of several springs inserted into the tube on the heat exchange effect was analyzed. The results show that: with the increase of the number of springs inserted into the tube, the velocity of the fluid in the spring heat exchange tube gradually decreases, and the pressure drop also gradually decreases, the velocity field gradually presents a symmetrical distribution along the central axis, the flow state of the fluid gradually tends to be stable, and the distribution of pressure field and temperature field in the tube is gradually uniform. When the Reynolds number was 20000, the heat transfer coefficient of the four-helical spring heat exchange tube was increased by 11.45W·m²·K^-1 and pressure drop was decreased by 40.31Pa compared with that of single-helical spring heat exchange tube; when the Reynolds number was 40000, the heat transfer coefficient of the four-helical spring heat exchange tube was increased by 3.94W·m²·K^-1 and pressure drop was decreased by 157.88Pa compared with that of single-helical spring heat exchange tube.