Progress in Nuclear Energy ( IF 2.7 ) Pub Date : 2021-03-22 , DOI: 10.1016/j.pnucene.2021.103695 Shuhang Zhou , Yi Li , Yan Sun , Haozhi Bian , Ming Ding
Steam condensation consisting of noncondensable gas has been broadly investigated on external surfaces of various single tube and plates. Previous numerical analyses revealed that the high concentration air layer (HCAL) is the main thermal resistance for condensation. Comparing with the single tube/plate, condensation for bundle can be more complex. The HCAL near the adjacent tube surfaces may interfere and then influencing flow and heat transfer characteristics in the bundle. To evaluate the bundle effect, this study conducted experiments based on a 3 × 3 tube bundle at a wider pressure range (0.15–1.6 MPa). The results indicate that the bundle effect can be divided into two sub-effects: the enhancement effect and the inhibition effect, and the enhancement effect can make the average heat transfer performance of the bundle better than that of the single tube. The parameter thresholds for the two sub-effects were determined according to the broaden parameter scope. Generally, at small subcooling and low pressures, the inhibition effect dominants, and the bundle condensation heat transfer coefficient (CHTC) can be 22% less than that of the single tube; at large subcooling and high pressures, the enhancement effect dominants, and the bundle CHTC can be 71% greater.
中文翻译:
基于宽压力范围实验的束对蒸汽冷凝作用的评估和分类
在各种单管和板的外表面上已经广泛地研究了由不凝性气体组成的蒸汽凝结。先前的数值分析表明,高浓度空气层(HCAL)是冷凝的主要热阻。与单管/板相比,束的冷凝更复杂。相邻管表面附近的HCAL可能会干扰然后影响束中的流动和传热特性。为了评估管束效应,本研究基于3×3管束在较宽的压力范围(0.15–1.6 MPa)下进行了实验。结果表明,束效应可分为两个子效应:增强效应和抑制效应,增强效果可使管束的平均传热性能优于单管。根据扩大的参数范围确定两个子效果的参数阈值。通常,在较小的过冷和低压下,抑制效果占优势,并且束凝结换热系数(CHTC)可以比单管小22%。在大的过冷和高压下,增强效果占主导地位,而束CHTC可以大71%。