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  • choked flow mechanism of hfc-134a flowing through short-tube orifices

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1208
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this paper is a continuation of the author’s previous work. new experimental data on the occurrence of choked flow phenomenon and mass flow rate of hfc-134a inside short-tube orifices under choked flow condition are presented. short-tube orifices diameters ranging from 0.406 mm to 0.686 mm with lengths ranging from 1 mm to 3 mm which can be applied to a miniature vapour-compression refrigeration system are examined. the experimental results indicated that the occurrence of choked flow phenomena inside short-tube orifices is different from that obtained from short-tube orifice diameters of greater than 1 mm, which are typically used in air-conditioner. the beginning of choked flow is dependent on the downstream pressure, degree of subcooling, and length-to-diameter ratio. under choked flow condition, the mass flow rate is greatly varied with the short-tube orifice dimension, but it is slightly affected by the operating conditions. a correlation of mass flow rate through short-tube orifices is proposed in terms of the dimensionless parameters. the predicted results show good agreement with experimental data with a mean deviation of 4.69%.

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