Dimensionless Parameters in Stability Analysis of Heated Channels with Fluids at Supercritical Pressures
Dimensionless Parameters in Stability Analysis of Heated Channels with Fluids at Supercritical Pressures
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DOI：
10.1115/icone14-89862
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发表时间：
2008-08
期刊：
影响因子：
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通讯作者：
W. Ambrosini;M. Sharabi
中科院分区：
文献类型：
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作者：
W. Ambrosini;M. Sharabi
本文提出了无量纲参数的稳定性分析，在加热通道与超临界流体。参数设计的基础上的经典的相变和过冷数的情况下，沸腾通道，提出了一种新的配方，利用流体的性质在伪临界温度作为压力的函数。所采用的配方为一个给定的流体的无量纲密度提供了一个独特的无量纲焓的依赖关系，在一个合理的范围内的系统压力，从而得到的无量纲参数的函数的不稳定条件的预测的一般性。结果表明，这些参数允许建立定量的稳定性映射为一个单一的加热通道施加的整体压降，在类比与先前的工作中提出的沸腾通道。指出了与沸腾通道稳定性现象的相似性，也支持了系统代码预测的结论。
The paper proposes dimensionless parameters for the analysis of stability in heated channels with supercritical fluids. The parameters are devised basing on the classical phase change and subcooling numbers adopted in the case of boiling channels, proposing a novel formulation making use of fluid properties at the pseudo-critical temperature as a function of pressure. The adopted formulation for dimensionless density of a given fluid provides a unique dependence with respect to dimensionless enthalpy, in a reasonably wide range of system pressures, thus giving generality to the predictions of unstable conditions obtained as a function of dimensionless parameters. It is shown that these parameters allow setting up quantitative stability maps for a single heated channel with imposed overall pressure drop, in analogy with the ones proposed in previous work concerning boiling channels. Similarities with the boiling channel stability phenomena are pointed out, also supporting the conclusions with system code predictions.Copyright © 2006 by ASME