Choked flow mechanism of HFC-134a flowing through short-tube orifices
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Author list: Nilpueng K., Wongwises S.
Publisher: Elsevier
Publication year: 2011
Journal: Experimental Thermal and Fluid Science (0894-1777)
Volume number: 35
Issue number: 2
Start page: 347
End page: 354
Number of pages: 8
ISSN: 0894-1777
eISSN: 1879-2286
Languages: English-Great Britain (EN-GB)
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Abstract
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%. ฉ 2010 Elsevier Inc.
Keywords
Critical mass flow rate, Vapour-compression refrigeration system
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