Prediction of two‐phase flow distribution in parallel pipes using stability analysis

Pustylnik, Ludmila; Barnea, Dvora; Taitel, Yehuda

doi:10.1002/aic.10949

Cited by 27 publications

(8 citation statements)

References 16 publications

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“…Also, since the total input gas and solids flow rates are constant, dP in / dQ st !À1 at the limit. (Pustylnik et al 34 reached the same result for a gas-liquid system. Detailed calculations are available elsewhere 35 ).…”

Section: Stability Analysissupporting

confidence: 65%

Gas‐solid flow distribution through identical vertical passages: Modeling and stability analysis

et al. 2010

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in Wiley InterScience (www.interscience.wiley.com).As previous evidence shows, the distribution of gas-solid flow traveling through identical parallel paths can be significantly nonuniform, often with harmful operating consequences in practice. A fundamental analytical and numerical study is performed on the distribution of gas-solid pneumatic flow passing through a ''Y branch''. While many steady-state gas-solid distribution solutions, including a uniform distribution, satisfy the governing equations, linear stability analysis indicates that the uniform distribution is stable the most likely solution of the system. Both 2-D (two-dimensional) and 3-D multiphase computational fluid dynamic simulations and stability analyses confirm the analytical conclusions.

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Section: Stability Analysissupporting

confidence: 65%

Gas‐solid flow distribution through identical vertical passages: Modeling and stability analysis

et al. 2010

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“…Experimental, analytical, and simulation studies have been reported to establish stability criteria [7,20,21,22,23,24] With the simplified parallelpipe flow analysis by [25], a control procedure was proposed in [8] to regulate the individual pipe flow rates with a desired pipe exit quality through a set of inlet control valves. To suppress the two-phase flow instability in microchannels, the methods of inlet control valve [8], inlet restrictors [26] and inlet seed bubble generators [27] were proposed.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis and maldistribution control of two-phase flow in parallel evaporating channels

Zhang

Wen

Julius

et al. 2011

International Journal of Heat and Mass Transfer

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Parallel channel heat transfer system is an attractive means to enhance heat transfer by increasing the total surface area in the heat exchanger. Uniform distribution of flow in the channels is an important operation attribute in order to avoid channel dryout and the subsequent hot spots and possible device failure. For the system operating in the single-phase regime, uniform flow distribution is a stable equilibrium. However, in the two-phase boiling regime, stable equilibrium bifurcates -the uniform distribution becomes unstable, and new stable or unstable non-uniform distributions, or maldistributions, equilibria emerge. As a result, parallel channel heat exchangers typically operate in the single phase regime to avoid such "maldistribution instability." This paper presents a stability analysis and active flow and temperature control of a parallel channel evaporator in a pumped two-phase boiling heat transfer loop. We show that for identical channels, the system is uncontrollable with the pump alone and unobservable from the overall flow rate measurement. A conventional solution involves introducing additional valve-induced pressure drop, but the drawback is a resulting higher pumping power. We present a new, somewhat surprising, result that if the channel characteristics are all distinct, the system actually becomes controllable from * Corresponding author: TieJun Zhang, Tel.: +1-518-276-2125, Fax: +1-518-276-4897, E-mail: tjzhrpi@gmail.com the pump and observable from the total loop flow rate. For non-identical parallel systems, we show a controller design approach and demonstrate its efficacy through a simulation example.

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“…In this analysis the global behavior and flow distribution for equally heated channels and unbalanced heated channels was clearly shown and explained based on the characteristic curves of each channel. In the last decade many studies have also dealt with flow distribution and pressure drop vs. mass flux behavior for a parallel arrange of boiling channels (Minzer et al, 2006(Minzer et al, , 2004Natan et al, 2003;Pustylnik et al, 2006;Taitel et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Experimental study of pressure drop oscillations in parallel horizontal channels

Chiapero

Fernandino

Dorao

2014

International Journal of Heat and Fluid Flow

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Prediction of two‐phase flow distribution in parallel pipes using stability analysis

Cited by 27 publications

References 16 publications

Gas‐solid flow distribution through identical vertical passages: Modeling and stability analysis

Gas‐solid flow distribution through identical vertical passages: Modeling and stability analysis

Stability analysis and maldistribution control of two-phase flow in parallel evaporating channels

Experimental study of pressure drop oscillations in parallel horizontal channels

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