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为检验经典的临界热流密度(critical heat flux,CHF)流体模化方法对于卧式螺旋管的应用效果,采用大功率直流电加热的方法对制冷剂HFC-134a在卧式螺旋管内的流动沸腾CHF进行了实验测试。通过运用Ahmad和Katto模型对实验测试数据和已有数据源进行模化计算发现:Ahmad和Katto模型确定的流量模化因子对于卧式螺旋管CHF的流体模化会产生较大的偏差,导致预测的CHF值高于实验结果。在实验数据分析的基础上提出了卧式螺旋管CHF流量模化因子的经验关联式。计算结果表明:应用该关联式对实验条件下卧式螺旋管CHF的预测偏差在±20%以内,其流体模化精度明显优于Ahmad和Katto模型。
In order to test the application of the classical critical heat flux (CHF) fluid modeling method to the horizontal spiral tube, the flow boiling CHF of the refrigerant HFC-134a in the horizontal spiral tube was conducted by high-power direct current heating The experimental test. By using the Ahmad and Katto models to model experimental data and existing data sources, it is found that the flow modeling factors determined by Ahmad and Katto models will cause large deviations in fluid modeling of the horizontal spiral CHF, leading to the prediction CHF value higher than the experimental results. On the basis of experimental data analysis, the empirical correlation of the modal factors of CHF flow in horizontal spiral pipe is proposed. The calculation results show that the predicting deviation of horizontal helical CHF under the experimental condition is within ± 20%, and the fluid modeling accuracy is better than that of Ahmad and Katto model.