Numerical simulation of annular flow hydrodynamics in microchannels
•CFD simulation of steady, laminar, fully-developed annular flow.•Investigation of Kelvin-Helmholtz instability using numerical perturbations.•Numerical investigation of interfacial instabilities of inviscid parallel flows.•Comparison between simulation results and existing analytical theories. Annu...
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| Published in | Computers & fluids Vol. 133; pp. 90 - 102 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
15.07.2016
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0045-7930 1879-0747 |
| DOI | 10.1016/j.compfluid.2016.04.017 |
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| Abstract | •CFD simulation of steady, laminar, fully-developed annular flow.•Investigation of Kelvin-Helmholtz instability using numerical perturbations.•Numerical investigation of interfacial instabilities of inviscid parallel flows.•Comparison between simulation results and existing analytical theories.
Annular flow is the dominant flow regime in microchannel flow boiling because it appears at very low vapor quality and persists until dryout at high quality. This flow regime is hydrodynamically unstable, as the phase interfaces are subject to instabilities triggered by flow perturbations. In this work, a computational fluid dynamics (CFD) model is proposed and verified for the studies of annular flow hydrodynamics in microchannels, using the commercial software ANSYS Fluent. Verification of the model is performed by comparing simulation results with existing analytical theories. The potential for the application of this model to microchannel annular flow boiling has been demonstrated. |
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| AbstractList | •CFD simulation of steady, laminar, fully-developed annular flow.•Investigation of Kelvin-Helmholtz instability using numerical perturbations.•Numerical investigation of interfacial instabilities of inviscid parallel flows.•Comparison between simulation results and existing analytical theories.
Annular flow is the dominant flow regime in microchannel flow boiling because it appears at very low vapor quality and persists until dryout at high quality. This flow regime is hydrodynamically unstable, as the phase interfaces are subject to instabilities triggered by flow perturbations. In this work, a computational fluid dynamics (CFD) model is proposed and verified for the studies of annular flow hydrodynamics in microchannels, using the commercial software ANSYS Fluent. Verification of the model is performed by comparing simulation results with existing analytical theories. The potential for the application of this model to microchannel annular flow boiling has been demonstrated. Annular flow is the dominant flow regime in microchannel flow boiling because it appears at very low vapor quality and persists until dryout at high quality. This flow regime is hydrodynamically unstable, as the phase interfaces are subject to instabilities triggered by flow perturbations. In this work, a computational fluid dynamics (CFD) model is proposed and verified for the studies of annular flow hydrodynamics in microchannels, using the commercial software ANSYS Fluent. Verification of the model is performed by comparing simulation results with existing analytical theories. The potential for the application of this model to microchannel annular flow boiling has been demonstrated. |
| Author | Fletcher, David F. Haynes, Brian S. Guo, Zhenyi |
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| Cites_doi | 10.1016/S0301-9322(97)00087-6 10.1017/S0022112059000842 10.1016/j.apm.2015.04.022 10.1016/0301-9322(77)90012-X 10.1016/0021-9991(81)90145-5 10.1016/0301-9322(96)00010-9 10.1016/j.ces.2010.07.004 10.1017/S0022112059000568 10.1002/(SICI)1097-0363(19990330)29:6<685::AID-FLD807>3.0.CO;2-D 10.1016/S0997-7546(01)01161-X 10.1016/j.ces.2013.10.027 10.1080/10893950490477518 10.1115/1.4005126 10.1115/1.4005710 10.1016/j.cep.2013.12.004 10.1016/S0301-9322(00)00070-7 10.1016/0021-9991(92)90240-Y 10.1016/j.ijthermalsci.2014.10.017 10.1177/1757482X16634205 10.1016/0017-9310(89)90155-5 10.1016/S0301-9322(98)00054-8 10.1016/S0017-9310(98)00362-7 10.1016/j.expthermflusci.2010.08.004 10.1016/j.ces.2009.03.018 10.1260/1757-482X.6.2.79 10.1016/j.ijthermalsci.2006.07.012 10.1016/j.ijmultiphaseflow.2004.05.002 |
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| Keywords | Interfacial instabilities Annular flow hydrodynamics Microchannel annular flow K-H instability Computational fluid dynamics (CFD) Flow boiling in microchannels |
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| Snippet | •CFD simulation of steady, laminar, fully-developed annular flow.•Investigation of Kelvin-Helmholtz instability using numerical perturbations.•Numerical... Annular flow is the dominant flow regime in microchannel flow boiling because it appears at very low vapor quality and persists until dryout at high quality.... |
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| SubjectTerms | Annular flow Annular flow hydrodynamics Boiling Computational fluid dynamics Computational fluid dynamics (CFD) Computer simulation Flow boiling in microchannels Fluid flow Hydrodynamics Interfacial instabilities K-H instability Mathematical models Microchannel annular flow Microchannels |
| Title | Numerical simulation of annular flow hydrodynamics in microchannels |
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