Abstract: Centrifugal buoyancy arising from radial temperature gradient of fluid has a great influence on the enhanced heat transfer performance of swirling flow. An experimental comparative investigation on the influence of centrifugal buoyancy on the heat transfer enhancement of swirling flow was carried out via exchanging hot and cool water in shell-side and tube-side respectively in a swirling flow tube-shell heat exchanger，in which heat transfer was enhanced by spiral fluted tubes and rod baffles. The results showed that the total heat transfer coefficient of heat exchanger with hot water arranged in shell-side was relatively higher by 33% than that with hot water arranged in tube-side. Therefore，the influence of centrifugal buoyancy on the heat transfer performance of tube-shell heat exchanger with swirling flow was not negligible. Furthermore，the influence of centrifugal buoyancy on the performance of heat transfer was more distinct in the case of swirling flow existing in the side of larger thermal resistance.

摘要： 由流体径向温度梯度引起的离心浮力对旋流强化传热效果有重要影响。通过管程与壳程均有旋转流动的折流栅-螺旋槽管水-水换热器，就离心浮力对旋流强化传热效果的影响进行了管、壳程冷、热流体交换的对比实验研究。结果表明：在相同的管、壳程流速下热流体在壳程时换热器总传热系数比热流体在管程时相对高出约33%。故在有旋流存在的管壳式换热器中，离心浮力对换热器传热性能的影响不可忽视。当热阻较大一侧有旋流存在时，离心浮力对换热器传热性能的影响更为明显。