Research Papers

Computational Fluid Dynamics Modeling of Two-Phase Flow in an Adiabatic Capillary Tube

[+] Author and Article Information
Yogesh K. Prajapati, Mohd. Kaleem Khan

Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patliputra Colony,
Patna 800013, Bihar, India

Manabendra Pathak

Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patliputra Colony,
Patna 800013, Bihar, India
e-mail: mpathak@iitp.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received May 26, 2014; final manuscript received September 10, 2014; published online October 28, 2014. Assoc. Editor: Bengt Sunden.

J. Thermal Sci. Eng. Appl 7(1), 011006 (Oct 28, 2014) (7 pages) Paper No: TSEA-14-1130; doi: 10.1115/1.4028571 History: Received May 26, 2014; Revised September 10, 2014

In this work computational fluid dynamics (CFD) technique has been used to analyze the detailed flow structures of refrigerant R-134a in an adiabatic capillary tube using volume of fluid based finite volume method. Also, an attempt has been made to understand the flashing phenomenon within the adiabatic capillary tube. A source term has been incorporated in the governing equations to model the mass transfer rate from liquid phase to vapor phase during the flashing process. The developed numerical model has been validated with the available experimental data. The unsteady variations of flow properties such as velocity, void fraction distributions, and flow turbulence across the cross section and at different axial length of the tube have been presented. It has been observed that flashing initiates from the wall of the tube. With the inception of vapor, the flow properties change drastically with very short transient period. As far as flow turbulence is concerned, the role of flashing parameter seems to be stronger than internal tube wall roughness.

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Fig. 1

Adiabatic capillary tube

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Fig. 2

Grid of hexahedral elements

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Fig. 3

Validation of present model with Li et al. [37] experimental data

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Fig. 4

Velocity profile at different locations for different time levels

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Fig. 5

Turbulence intensity at different locations for different time levels

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Fig. 6

Turbulence kinetic energy at different locations for different time levels

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Fig. 7

Void fraction for different time levels

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Fig. 8

Void fraction contour plot




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