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Research Papers

Effect of Tilt Angle on Subcritical/Supercritical Carbon Dioxide-Based Natural Circulation Loop With Isothermal Source and Sink

[+] Author and Article Information
Ajay Kumar Yadav

Assistant Professor
Department of Mechanical Engineering,
National Institute of Technology Karnataka,
Surathkal, Mangalore 575 025, Karnataka, India
e-mail: ajayyadav.aba@rediffmail.com

M. Ram Gopal

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721 302, India
e-mail: ramg@mech.iitkgp.ernet.in

Souvik Bhattacharyya

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur 721 302, India
e-mail: souvik.iit@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received April 26, 2014; final manuscript received October 24, 2014; published online November 11, 2015. Assoc. Editor: Bengt Sunden.

J. Thermal Sci. Eng. Appl 8(1), 011007 (Nov 11, 2015) (8 pages) Paper No: TSEA-14-1086; doi: 10.1115/1.4030702 History: Received April 26, 2014

In recent years, a growing popularity of carbon dioxide (CO2) as a secondary fluid has been witnessed in both forced as well as in natural circulation loops (NCLs). This may be attributed to the favorable thermophysical properties of CO2 in addition to the environmental benignity of the fluid. However, an extensive literature review shows that studies on CO2-based NCLs are very limited. Also, most of the studies on NCLs do not consider the three-dimensional variation of the field variables. In the present work, three-dimensional computational fluid dynamics (CFD) models of a NCL with isothermal source and sink have been developed to study the effect of tilt angle in different planes. Studies have been carried out employing subcritical (liquid and vapor) as well as supercritical phase of CO2 as loop fluid at different operating pressures and temperatures. Results are obtained for a range of tilt angles of the loop, and a significant effect is observed on heat transfer, mass flow rate, and stability of the loop. It was also found that changing the orientation of the loop could be an elegant and effective solution to the flow instability problem of NCLs.

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Figures

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Fig. 1

(a) Schematic of the NCL employed in the model, (b) rotation of the loop in XY plane (front view), and (c) rotation of the loop in YZ plane (side view)

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Fig. 2

Meshing of a cross section (fluid part only)

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Fig. 3

(a) Variation of temperature throughout the loop for different tilt angles in XY plane, (b) variation of temperature throughout the loop for different tilt angles in YZ plane, (c) variation of velocity throughout the loop for different tilt angles in XY plane, and (d) variation of velocity throughout the loop for different tilt angles in YZ plane

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Fig. 4

(a) Variation in heat flux rate with angle of tilt in XY plane and (b) variation in heat flux rate with angle of tilt in YZ plane

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Fig. 5(a)

Variation in mass flow rate with angle of tilt in XY plane and (b) variation in mass flow rate with angle of tilt in YZ plane

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Fig. 6

Variation in heat flux with source temperature

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Fig. 7

(a) Variation in temperature for different tilt angles (supercritical), (b) variation in mass flow rate for different tilt angles (supercritical), (c) variation in temperature for different tilt angles (subcritical vapor), (d) variation in mass flow rate for different tilt angles (subcritical vapor), (e) variation in temperature for different tilt angles (subcritical liquid), and (f) variation in mass flow rate for different tilt angles (subcritical liquid)

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Fig. 8

Validation of obtained result with experimental data

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