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Analysis of Annular Two-phase Flow Dynamics under Heat Transfer Conditions
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
2005 (English)In: Journal of Enhanced Heat Transfer, ISSN 1065-5131, Vol. 1, 1-22 p.Article in journal (Refereed) Published
Abstract [en]

An analytical investigation was performed for the instability phenomenon of two-phase annular flow with a thin film flow on the channel wall under the heat transfer conditions. The analyses of heat transfer behaviours of two-phase annular flow showed that the overall heat transfer behaviours between the fluids and the channel wall were dominated by the thickness of a thin liquid film. The mass, momentum and energy equations for two phases were employed to study the perturbation behaviours in both fluids. Two different boundary conditions at the wall were considered: heat transfer with constant temperature along the wall and then conditions of constant heat transfer along the wall. Basic equations were solved on both hydrodynamic and thermal perturbations in two fluids for two different boundary conditions. Scrupulous analysis was done for the axially symmetrical wave at two-phase interface. The results showed that in case of small flow rate, the hydrodynamic perturbations in both fluids always decreased. Only kinematical waves at the gas-liquid interface could exist, but did not grow. The waves moved at the same velocity as the gas phase in the channel core. However, the thermal perturbations might grow in some conditions. They finally caused hydrodynamic perturbations, which might also grow, causing a flow instability. The solutions for characteristics of the interface waves such as wavelength and increment of perturbations were obtained. More interestingly, for the isothermal boundary conditions it was found that the maximum increment of perturbations (most unstable) was only dependent on the thermodynamical property ratios of the gas and liquid.

Place, publisher, year, edition, pages
Begell House, 2005. Vol. 1, 1-22 p.
Keyword [en]
film flow vapor liquid instability
National Category
Engineering and Technology
Research subject
SRA - Energy
URN: urn:nbn:se:kth:diva-88663DOI: 10.1615/JEnhHeatTransf.v12.i1.30ISI: 000227629000003OAI: diva2:502518
QC 20120216Available from: 2012-02-16 Created: 2012-02-14 Last updated: 2012-02-16Bibliographically approved

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