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Author: search.filters.author.Kaew-On, JatupornSubject: search.filters.subject.Flow boiling

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    An experimental investigation of flow boiling heat transfer of R-134a in horizontal and vertical mini-channels
    (2013-04-01)
    Saisorn, Sira
    ;
    Kaew-On, Jatuporn
    ;
    Wongwises, Somchai
    Flow boiling experiments with R-134a flowing in horizontal and vertical mini-channels are performed to obtain flow visualization and heat transfer data. A 1.75mm diameter channel with a length of 600mm is used as test section. Two sets of the horizontal flow and vertical upward flow data are presented based on a mass flux range of 200-1000kg/m<sup>2</sup>s, a heat flux range of 1-80kW/m<sup>2</sup> and a saturation pressure range of 7-13bar. Flow visualization and heat transfer results show heat transfer coefficient depending on flow pattern. The results also indicate that flow regime transition and heat transfer coefficient tend to depend on flow direction under the certain experimental conditions. In addition, the comparisons between the experimental data and the predictions recommended for either macro-scale flow boiling or micro-scale flow boiling are presented in this work. © 2012 Elsevier Inc.
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    Two-phase flow of R-134a refrigerant during flow boiling through a horizontal circular mini-channel
    (2011-09-01)
    Saisorn, Sira
    ;
    Kaew-On, Jatuporn
    ;
    Wongwises, Somchai
    This research focuses on heat transfer to R-134a during flow boiling in a 1.75. mm internal diameter tube. Flow visualisation and heat transfer experiments are conducted to obtain heat transfer coefficients for different flow patterns. The measured data in each flow regime are compared with predictions from a three-zone flow boiling model. The calculations are in fair agreement with the experimental results which correspond in particular to slug flow, throat-annular flow and churn flow regimes under conditions of low heat flux. © 2011 Elsevier Inc.
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    Flow pattern and heat transfer characteristics of R-134a refrigerant during flow boiling in a horizontal circular mini-channel
    (2010-09-01)
    Saisorn, Sira
    ;
    Kaew-On, Jatuporn
    ;
    Wongwises, Somchai
    Flow boiling heat transfer of R-134a refrigerant in a circular mini-channel, 600mm long with a diameter of 1.75mm, is investigated experimentally in this study. The test section is a stainless steel tube placed horizontally. Flow pattern and heat transfer coefficient data are obtained for a mass flux range of 200-1000kg/m<sup>2</sup>s, a heat flux range of 1-83kW/m<sup>2</sup> and saturation pressures of 8, 10, and 13bar. Five different flow patterns including slug flow, throat-annular flow, churn flow, annular flow and annular-rivulet flow are observed and the heat transfer coefficient data for different flow patterns are presented. The heat transfer coefficient increases with increasing heat flux but is mostly independent of mass flux and vapour quality. In addition, it is indicated from the experiments that the higher the saturation pressure, the lower is the heat transfer coefficient. Comparisons of the present data with the existing correlations are also presented. © 2010 Elsevier Ltd.