Parallel-Channel Instability in Natural Circulation System

Hirayama, Mio; Umekawa, Hisashi; Ozawa, Mamoru

doi:10.1615/multscientechn.v18.i4.10

Cited by 5 publications

(3 citation statements)

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“…When a forced perturbation is imposed, periodic, quasi-periodic and chaotic oscillations may appear. In Hiraya et al [258] a lumped-parameter model is used to study two parallel channels in a natural convection regime. In-phase (loop instability) and out-of-phase (channel-to-channel) oscillations are found.…”

Section: Dwo In Parallel Channelsmentioning

confidence: 99%

Two-phase flow instabilities: A review

Ruspini

Marcel

Clausse

2014

International Journal of Heat and Mass Transfer

328

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Section: Dwo In Parallel Channelsmentioning

confidence: 99%

Two-phase flow instabilities: A review

Ruspini

Marcel

Clausse

2014

International Journal of Heat and Mass Transfer

328

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“…Several experimental, theoretical and numerical studies have been performed in the area of two-phase flow instabilities in parallel channels ( Libo et al, 2014;Aritomi et al, 1979;Fukuda et al, 1979;Clausse et al, 1989;Podowski et al, 1990;Guido et al, 1991;Xiao et al, 1993;Lee et al, 1999;Hirayama et al, 2006;Yun et al, 2008;Zhang et al, 2009;Guo et al, 2010, Lee et al,2014, zhou et al,2013, Chiapero et al,2013, Paul et al,2014, Hua et al,2015. Aritomi et al (1977), investigated density wave oscillations in parallel channels by using a nonlinear model.…”

Section: Introductionmentioning

confidence: 99%

Study of Inertia and Compressibility Effects on the Density Wave Oscillations of Two-Phase Boiling Flows in Parallel Channels

Bakhshan

Kazemi

Niazi

et al. 2017

JAFM

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In this research, a theoretical model is presented to investigate the density wave oscillations (DWOs), in two horizontal parallel channels with lumped parameter model based on two phase homogeneous hypothesis. The parallel channel is composed of the entrance section, heating section and outlet section and the model consists of the boiling channel model, pressure drop model, parallel channel model, constructive model and inertia and compressibility effects, while subcooled boiling effect is neglected and the governing equations are solved by Gear method. The model is validated with experimental data of a single channel flow instability experiment. Then the flow instability in twin channel system is studied under different conditions. This model can analyze the effects of external parameters, such as fluid inertia and compressible gases on the stability margins of density wave oscillations. The results show that, the fluid inertia and compressible gases can significantly change the stability margins of two parallel channels; in fact, the stability behavior of two parallel channel system improves with increasing the inlet inertia and outlet compressibility but, increasing the outlet inertia and inlet compressibility have negative effects the system stability.

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“…Most of the experimental, theoretical and numerical studies performed on two-phase flow instabilities in parallel channels have dealt with DWO (Aritomi et al, 1979;Clausse et al, 1989;Fukuda and Kobori, 1979;Guido et al, 1991;Guo et al, 2010;Hirayama et al, 2006;Lee and Pan, 1999;Podowski et al, 1990;Xiao et al, 1993;Yun et al, 2008;Zhang et al, 2009). Among these few studies dealing with PDO oscillations in parallel channels, Kakaç et al (1977) performed an experimental study reporting oscillations in the inlet pressure of a setup of four parallel channels with cross connections.…”

Section: Introductionmentioning

confidence: 99%