Flow instabilities in parallel-channel flow systems of gas-liquid two-phase mixtures

Ozawa, Mamoru; Akagawa, Koji; Sakaguchi, Tadashi

doi:10.1016/0301-9322(89)90058-x

Cited by 65 publications

(21 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Rizwan-uddin and Doming [26,27] conducted non-linear numerical simulations of density-wave oscillations. Ozawa et al [28] have used the Liapunov method to determine the stability of their parallel-channel system against pressure-drop type oscillations. Zhang et al [29] developed an explicit criterion for density-wave instability by using the Liapunov method.…”

Section: Dynamical System Analysismentioning

confidence: 99%

A Review of two-phase flow dynamic instabilities in tube boiling systems

Kakaç

Bon

2008

International Journal of Heat and Mass Transfer

356

127

View full text Add to dashboard Cite

Section: Dynamical System Analysismentioning

confidence: 99%

A Review of two-phase flow dynamic instabilities in tube boiling systems

Kakaç

Bon

2008

International Journal of Heat and Mass Transfer

356

127

View full text Add to dashboard Cite

“…For N = 2, the condition becomes s 1 + s 2 > 0 (same as [20] where the condition was shown for A i = A). For N = 3, using the principal minor test for positive definiteness, the condition becomes, s 1 + s 2 > 0 and s 1 s 2 + s 2 s 3 + s 1 s 3 > 0.…”

Section: Stability Analysis Of Parallel Channels With Inlet Pressure mentioning

confidence: 99%

“…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

View full text Add to dashboard Cite

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.

show abstract

“…[1][2][3][4][5][6][7][8][9][10][11] Considerable amount of work on flow in parallel pipes were performed for a boiling system where stability and flow-distribution were the main objective. [12][13][14][15] Note, however, that for boiling systems the splitting in the inlet manifold is when the fluid is in a single phase. Only after splitting into the parallel pipes, boiling and two-phase flow, takes place.…”

Section: Introductionmentioning

confidence: 99%