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Research Papers

Experimental and Numerical Investigation of a Single-Phase Square Natural Circulation Loop

[+] Author and Article Information
Ritabrata Saha

School of Nuclear Studies and Application,
Jadavpur University,
Kolkata, West Bengal 700032, India
e-mail: saha_ritabrata@yahoo.com

Swarnendu Sen

Department of Mechanical Engineering,
Jadavpur University,
Kolkata, West Bengal 700032, India
e-mail: sen.swarnendu@gmail.com

Saikat Mookherjee

Department of Mechanical Engineering,
Jadavpur University,
Kolkata, West Bengal 700032, India
e-mail: smookherjee13@gmail.com

Koushik Ghosh

Department of Mechanical Engineering,
Jadavpur University,
Kolkata, West Bengal 700032, India
e-mail: kghosh@mech.jdvu.ac.in

Achintya Mukhopadhyay

Department of Mechanical Engineering,
Jadavpur University,
Kolkata, West Bengal 700032, India
e-mail: achintya.mukho@gmail.com

Dipankar Sanyal

Department of Mechanical Engineering,
Jadavpur University,
Kolkata, West Bengal 700032, India
e-mail: dipans26@gmail.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 29, 2014; final manuscript received May 4, 2015; published online August 11, 2015. Assoc. Editor: Sumanta Acharya.

J. Heat Transfer 137(12), 121010 (Aug 11, 2015) (8 pages) Paper No: HT-14-1352; doi: 10.1115/1.4030926 History: Received May 29, 2014

Experimental and numerical analyses are carried out for a natural circulation loop (NCL) under low and moderate heater power. The effect of ambient temperature variation on the loop thermal behavior has been taken into account in present study. The effect of liquid inertia has a role in the initial transience, as revealed by the numerical and experimental observations. The steady-state results from the present analyses are validated with the reported dimensionless results for NCL. The experimental steady-state results are in fair agreement with the developed lumped numerical models. At moderate power, the numerical and experimental results indicate periodic oscillations.

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References

Figures

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Fig. 1

(a) Schematic diagram. (b) Experimental setup of square NCL.

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Fig. 2

Nodalization diagram for RELAP code

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Fig. 3

Experimental temperature distribution of loop fluid in different zones with time at 180 W

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Fig. 4

Ambient temperature variation with time

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Fig. 5

Comparison of temperature of loop fluid at different ambient conditions at 206 W

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Fig. 6

Comparison of temperature of loop fluid between models and experiment at different ambient conditions at 250 W

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Fig. 7

Comparison of temperature of loop fluid between models and experiment at 230 W

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Fig. 8

Comparison of temperature of loop fluid between models and experiment at 250 W

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Fig. 9

Comparison of steady-state results in terms of nondimensional number with Vijayan et al. [28]

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Fig. 10

Numerical mass flux variation with time at 675 W

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Fig. 11

Variation of temperature difference with time at 675 W

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Fig. 12

Numerical mass flux variation with time at 775 W

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Fig. 13

Variation of temperature difference with time at 775 W

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