Experimental Study on External Condensation Heat Transfer Characteristics of Bellows
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摘要: 通过理论分析和实验验证,考察了冷凝流体在波纹管外表面的流动模型与传热情况,推导了波纹管冷凝传热系数的理论计算式;通过实验修正,计算式与实验结果较为一致,误差小于10%。同时研究了波纹管结构参数对波纹管强化传热性能的影响,探讨了其强化传热机理。结果表明,在滞流范围内,波纹管的传热系数为相同条件下直管的3～5倍,若考虑面积增加因素,强化传热效果为直管的5～7倍。Abstract: Flow model and heat transfer of condensation flow outside of bellows have been theoretically and experimentally studied.The formula for calculation of condensation heat transfer coefficient was deduced,and corrected through experiment.The calculation results are accordant with the experimental ones,and the errors is less than 10%.The effect of bellows structure parameters and pipe diameter on the enhancement heat transfer has been investigated.It is found that in the steady flow region,the average condensation heat transfer coefficient in a bellows is 3~5 times than that in a straight tube under the same conditions,and when considering the increasing in heat transfer area,the effectiveness of enhancement heat transfer is 5~7 times than that in a straight tube.To facilitate the engineering design and application of bellows,the formula for the calculation of the average heat transfer coefficient of a fluid in a bellows was also given.
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