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  • flow regimes and two-phase pressure gradient in horizontal straight tubes: experimental results for hfo-1234yf, r-134a and r-410a

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1106
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     two-phase flow regime visualizations of hfo-1234yf and r-134a in a 6.70 mm inner diameter glass straight tube have been simultaneous investigated by top and side views with a high speed high resolution camera. no major difference was observed between both refrigerants. hfo-1234yf flow regimes were satisfactorily predicted by the wojtan et al. [1] flow pattern map. in addition, 819 pressure drop data points measured during two-phase flow of refrigerants hfo-1234yf, r-134a and r-410a in horizontal straight tubes are presented. the tube diameter (d) varies from 7.90 to 10.85 mm. the mass velocity ranges from 187 to 1702 kg m−2 s−1 and the saturation temperatures from 4.8 °c to 20.7 °c. the results are compared against 10 well-known two-phase frictional pressure drop prediction methods. for the entire database, the best accuracy is given by the method of müller-steinhagen and heck [2] with around 90% of the data predicted within a ±30% error band. an analysis was carried out on the maximum pressure gradient and on the corresponding vapor quality. a statistical analysis for each flow regime was also carried out.

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