蒸汽加热垂直矩形窄通道传热特性实验研究  

Experimental study on heat transfer characteristics of vertical rectangular narrow channel by steam heating

作　　者：居一伟 陶乐仁[1] 金程 赵谢飞 黄理浩[1] JU Yi-wei;TAO Le-ren;JIN Cheng;ZHAO Xie-fei;Huang Li-hao(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power and Engineering,School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《化学工程》2023年第2期41-45,56,共6页Chemical Engineering(China)

基　　金：上海市动力工程多相流动与传热重点实验室资助项目(2019KJFZ201)。

摘　　要：以去离子水为工质,对1 400 mm×250 mm×2.75 mm的蒸汽加热垂直矩形窄通道展开沸腾传热特性实验研究。结果表明:质量流量变化对于平均传热系数的提升效果弱于入口温度的改变,窄通道内的传热机理以核态沸腾为主导因素;加热功率的提升对平均传热系数有促进作用,但是过大的干度会导致传热恶化,核态沸腾受到抑制,平均传热系数的增长受限;将实验数据与8个传热经验关系式对比,Kandlikar公式相较于其他公式的预测效果最好,并以Kandlikar公式为基础改进拟合了新的经验关系式,改进后的关系式与实验数据吻合良好,97.3%的数据预测误差在±40%以内。实验结果为板式换热器的评估和优化提供实验依据。Experimental investigation on the heat transfer characteristics of the deionized water flow was performed in a narrow vertical rectangular channel. The dimensions of the channel are 1 400 mm×250 mm×2.75 mm. The results show that the effect of mass flow on the average heat transfer coefficient is weaker than the inlet temperature, and the nucleate boiling is the dominant factor in the heat transfer mechanism in narrow channels. Increasing heating power can promote the average heat transfer coefficient, but excessive dryness will lead to heat transfer deterioration and the limitation of average heat transfer coefficient. Moreover, compared with 8 existing empirical correlations separately, Kandlikar correlation has the best prediction effect. Based on Kandlikar correlation, a new transfer correlation was proposed. The improved relation is in good agreement with the experimental data, and about 97.3% of the experimental points have deviations from the correlation within ±40%.The experimental results provide experimental basis for the evaluation and optimization of plate heat exchangers.

关 键 词：蒸汽加热 矩形窄通道 经验公式 

分 类 号：TK124[动力工程及工程热物理—工程热物理]