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Research Papers

An Experimental Study of the Flow of R-407C in an Adiabatic Spiral Capillary Tube

[+] Author and Article Information
M. K. Mittal, A. Gupta

Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India

R. Kumar1

Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, Indiaravikfme@iitr.ernet.in

1

Corresponding author.

J. Thermal Sci. Eng. Appl 1(4), 041003 (May 19, 2010) (8 pages) doi:10.1115/1.4001484 History: Received December 11, 2009; Revised March 16, 2010; Published May 19, 2010; Online May 19, 2010

The objective of this study is to investigate the effect of coiling on the flow characteristics of R-407C in an adiabatic spiral capillary tube. The characteristic coiling parameter for a spiral capillary tube is the coil pitch; hence, the effect of the coil pitch on the mass flow rate of R-407C was studied on several capillary tube test sections. It was observed that the coiling of the capillary tube significantly reduced the mass flow rate of R-407C in the adiabatic spiral capillary tube. In order to quantify the effect of coiling, the experiments were also conducted for straight a capillary tube, and it was observed that the coiling of the capillary tube reduced the mass flow rate in the spiral tube in the range of 9–18% as compared with that in the straight capillary tube. A generalized nondimensional correlation for the prediction of the mass flow rates of various refrigerants was developed for the straight capillary tube on the basis of the experimental data of R-407C of the present study, and the data of R-134a, R-22, and R-410A measured by other researchers. Additionally, a refrigerant-specific correlation for the spiral capillary was also proposed on the basis of the experimental data of R-407C of the present study.

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Figures

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Figure 1

Schematic diagram of the experimental setup

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Figure 2

(a) Spiral groove on the wooden disk; (b) spiral capillary tube test section; (c) horizontal position of the test section

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Figure 3

Comparison of the measured mass flow rates with the predicted mass flow rates by the correlation of Kim (4)

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Figure 4

Mass flow rate variation with subcooling for straight and spiral capillary tubes

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Figure 5

Mass flow rate variation with the capillary tube length for straight and spiral capillary tubes

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Figure 6

Mass flow rates with subcooling for spiral capillary tube of diameters of (a) 1.27 mm and (b) 1.52 mm operating at inlet pressures of 1470 kPa and 1860 kPa

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Figure 7

Comparison of the present correlation for the straight capillary tube with the database

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Figure 8

Comparison of the predicted mass flow rates with the data of R-134a, R-407C, R-22, and R-410A measured by other researchers

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Figure 9

Comparison of the predicted mass flow rates by the proposed correlation with the data of the present study and that of Khan (8) for a spiral capillary tube

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