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为了改善螺旋管内流动沸腾换热特性的预测方法,利用核态沸腾项和对流换热项的叠加原理建立了新的预测关联式.基于收集的大量实验数据和流动沸腾换热机理,分析螺旋管几何参数和实验参数对流动沸腾传热的影响,将已经建立的关联式分为2类,并用大量实验数据对其进行计算.为了考虑复杂管道对传热特性的影响,在新建立的螺旋管内流动沸腾传热预测关联式中引入了Dn因子.采用以R134a为介质的螺旋管内流动沸腾传热实验数据进行了验证,并计算新关联式的平均相对误差和均方根误差.结果表明,新的预测关联式与实验值吻合较好,可以用于螺旋管流动沸腾传热特性的预测分析.
In order to improve the predicting method of the flow boiling heat transfer in a spiral tube, a new predictive correlation is established by using the superposition principle of the nucleate boiling term and the convective heat transfer term.Based on the collected large amount of experimental data and the flow boiling heat transfer mechanism, Geometric parameters and experimental parameters on the flow boiling heat transfer, the established correlations are divided into two categories, and with a large number of experimental data to calculate it.In order to consider the complex pipe on the heat transfer characteristics of the newly established spiral tube The Dn factor was introduced into the correlation equation of fluidized boiling heat transfer.The experimental data of the flow boiling heat transfer in a spiral tube using R134a as a medium were validated and the average relative error and root mean square error of the new correlation were calculated.The results show that the new The predictive correlations are in good agreement with the experimental values and can be used to predict the heat transfer characteristics of the flow boiling of spiral coils.