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首页> 外文期刊>International Journal of Heat and Mass Transfer >Effects of exit-condition, gravity, and surface-tension on stability and noise-sensitivity issues for steady condensing flows inside tubes and channels
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Effects of exit-condition, gravity, and surface-tension on stability and noise-sensitivity issues for steady condensing flows inside tubes and channels

机译：出口条件，重力和表面张力对管和通道内稳定冷凝流的稳定性和噪声敏感性问题的影响

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摘要

The paper presents accurate numerical solutions of the full 2D governing equations for steady and unsteady laminar/laminar internal condensing flows of pure vapor (FC-72 and R-113) inside a vertical tube and a channel. The film condensation is on the inside wall of a tube or one of the walls of a channel (the lower wall in case of a downward sloping channel). Computations find that exit condition specifications are important and are able to characterize the flows' sensitivity or insensitivity to the exit condition (which, in turn, depends upon the flow downstream of the condenser). If well-defined natural steady/quasi-steady flows exist- as is shown to be the case for gravity dominated or strong shear dominated condensate flows that remain parabolic up to the exit location- the computations are able to predict both the natural exit condition and any point of transition (from stable to unstable or smooth to wavy behavior) that may exist within this zone. Results on the role of surface tension and sensitivity to ever-present minuscule noise of the condensing surface are also reported.
机译：本文介绍了在垂直管和通道内的纯蒸汽（FC-72和R-113）的稳态和非稳态层流/层流内部冷凝流的完整2D控制方程的精确数值解。薄膜凝结在管的内壁或通道壁之一（向下倾斜的通道的情况下为下壁）上。计算发现出口条件规格很重要，并且能够表征流对出口条件的敏感度或不敏感度（这又取决于冷凝器下游的流量）。如果存在定义明确的自然稳态/准稳态流动-如重力主导或强剪切主导的凝结水流一直呈抛物线直至出口位置的情况，则该计算能够预测自然出口条件和此区域内可能存在的任何过渡点（从稳定到不稳定或从平稳到波浪状的行为）。还报道了表面张力的作用和对冷凝表面不断出现的微小噪声的敏感性的结果。

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