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对垂直上升光管内超临界水的传热恶化机理进行了分析。使用较宽管径范围内的实验数据对已有的传热恶化判据进行了校验和比较,指出了现有判据的不足。在已有判据的基础上,进一步考虑了管径变化对传热恶化的影响规律后,提出了一个新的传热恶化判据,该判据可在较宽管径范围内准确预测超临界水在垂直上升光管内的传热恶化,与已有的判据相比,新判据的预测结果更准确,适用范围也更广。讨论了新判据的优点和不足。
The mechanism of heat transfer deterioration of supercritical water in vertical rising tube was analyzed. Using the experimental data in a wide range of pipe diameters, the existing heat transfer deterioration criteria are checked and compared, and the deficiencies of the existing criteria are pointed out. Based on the existing criteria and further considering the influence of the variation of the tube diameter on the heat transfer, a new criterion of heat transfer deterioration is proposed, which can accurately predict the supercritical fluid in a wide range of diameters The heat transfer of water in the vertically rising light pipe is deteriorated. Compared with the existing criterion, the prediction result of the new criterion is more accurate and the scope of application is broader. The advantages and disadvantages of the new criterion are discussed.