管内加装波形板扰流件强化对流传热的试验研究

Experimental Study of the Intensified Convection Heat Transfer in a Tube Additionally Installed with Corrugated Plate Flow Disturbers Inside the Tube

采用试验的方法,对装有波形板扰流件的管内高温烟气在小Re数条件下的对流传热及阻力特性进行了研究,并将试验结果分别与无波形板和相关经验公式进行了比较。研究结果表明:管内加装波形板扰流件后,可使高温烟气的对流传热性能得到明显强化,且随着Re数的增大,强化效果越好;波形板扰流件的对流传热强化率为1.6-3.5。根据试验结果总结出1 300<Re<3 500时加装波形板扰流件后管内烟气的对流传热与管子阻力系数的关联式。

By using various test methods,studied were the convective flow heat transfer and resistance characteristics of the flue gases at a high temperature in a tube additionally installed with corrugated plate flow disturbers inside the tube under the condition of the Reynolds number being small and compared were the test results with those obtained in absence of the corrugated plates and calculated by using the empirical formulae respectively. It has been found that after the corrugated plate flow disturbers have been installed inside the tube,the convective flow heat transfer performance of the flue gases at a high temperature can be notably enhanced and with an increase of the Reynolds number,the enhancement effectiveness will become better and better. The convective flow heat transfer enhancement rate of the corrugated plate flow disturbers ranges from 1. 6 to 3. 5. As per the test results,a correlation formula of the heat quantity transferred and resistance coefficient of the tube installed with corrugated plate flow disturbers inside the tube within the test range( 1300 < Re < 3500) was summarized.