导流片的导流角度对其性能的影响

引起板翅式换热器内部物流分配不均匀的因素是多方面的 ,针对不同导流角度对导流片性能的影响进行了研究 .发现板翅式换热器内部存在着物流分配的不均匀 ,其中横向物流分配的不均匀性大于纵向物流分配的不均匀性 ;影响导流片性能的主要因素包括导流片的导流角度、Reynolds数等 ;当导流角为 45°时 ,其导流性能达到最佳 ,而总管流动阻力没有大的变化 .研究结论对板翅式换热器的优化设计具有重要意义

EFFECTS OF DIFFERENT INLET ANGLES ON DISTRIBUTOR PERFORMANCE

The plate-fin heat exchanger is normally designed with the assumption that the fluid is uniformly divided among all the core passages.However,the fluid flow maldistribution in plate-fin heat exchanger may be caused by many factors,such as improper entrance configuration,poor header design,manufacturing tolerance of passages and the heat transfer process itself.The objective of this paper is to study the effects of different inlet angles on the distribution performance of distributor.It is found that there is fluid flow maldistribution in plate-fin heat exchanger and the flow maldistribution in crosswise direction is more serious than that in ordinate direction.The experimental results also show that inlet angle and Reynolds number are the main factors affecting distributor performance and the distributor reaches the best performance when its inlet angle equals 45° under the experiment.The conclusions of this paper are of great significance for the optimum design of plate-fin heat exchanger.