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Experimental results on gravity driven fully condensing flows in vertical tubes, their agreement with theory, and their differences with shear driven flows' boundary-condition sensitivities

机译:垂直管中重力驱动的完全凝结流的实验结果,与理论的吻合以及与剪切驱动流的边界条件敏感性的差异

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摘要

This paper synthesizes experimental results with computational results towards development of a reliable heat transfer correlation for gravity driven annular wavy condensing flows inside a vertical tube. For fully condensing flows of pure vapor (FC-72) inside a vertical cylindrical tube of 6.6 mm diameter and 0.7 m length, the experimental conditions are typically annular wavy and they cover: mass flux G over a range of 2.9 kg/m~2 s≤G≤87.7 kg/m~2 s, temperature difference AT of 5-45 ℃, and length of full condensation x_FC in the range of 0<_FC< 0.7 m. The range of flow conditions over which there is good (within 15%) and poor (15-30% or >30%) agreement with the theory and modeling assumptions are discussed and these conditions have been identified. The paper also refers to key experimental results with regard to sensitivity of the flow to time-varying or quasi-steady (i.e. steady-in-the-mean) impositions of pressure at both the inlet and the outlet.
机译:本文将实验结果与计算结果综合起来,以开发可靠的传热相关性,以实现重力驱动的垂直管内的环形波浪状冷凝流。为了使纯蒸气(FC-72)完全冷凝在直径为6.6 mm,长度为0.7 m的垂直圆柱管内,实验条件通常为环形波状,它们涵盖:质量通量G范围为2.9 kg / m〜2 s≤G≤87.7kg / m〜2 s,温差AT为5-45℃,全冷凝长度x_FC为0 <_FC <0.7 m。讨论了与理论和建模假设一致(在15%内)和差(15-30%或> 30%)的流动条件范围,并确定了这些条件。本文还提到了关于流量对入口和出口处压力随时间变化或准稳态(即均值稳定)施加的敏感性的关键实验结果。

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