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Research Papers

Steady-State Performance of a Rectangular Natural Circulation Loop With Differentially Heated Parallel Channels

[+] Author and Article Information
Shubhankar Chakraborty

Department of Mechanical Engineering,
Indian Institute of Technology, Kharagpur,
Kharagpur 721302, West Bengal, India
e-mail: shubhankar@mech.iitkgp.ernet.in

Prasanta Kr. Das

Department of Mechanical Engineering,
Indian Institute of Technology, Kharagpur,
Kharagpur 721302, West Bengal, India
e-mail: pkd@mech.iitkgp.ernet.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received June 4, 2014; final manuscript received February 10, 2015; published online November 11, 2015. Assoc. Editor: Suman Chakraborty.

J. Thermal Sci. Eng. Appl 8(1), 011022 (Nov 11, 2015) (9 pages) Paper No: TSEA-14-1143; doi: 10.1115/1.4030692 History: Received June 04, 2014

Natural circulation loop (NCL) transfers thermal energy without using any external power. As with phase change, one can expect a higher rate of heat transfer and a greater change in density, NCL with a phase change of the circulating fluid is a more effective energy transfer device. Though in many of the practical NCLs there are multiple heating risers, the characteristics of NCLs with parallel boiling risers have not been investigated in detail. In the present work, the steady-state behavior of a two-phase NCL with two parallel boiling risers for water as the working fluid has been investigated. Emphasis has been given to the performance of the loop when the risers are differentially heated. Effect of different parameters on the loop circulation rate and energy transport for both equally and differentially heated conditions has been thoroughly examined and compared to the performance of a single-riser loop under equivalent working condition.

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References

Figures

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Fig. 1

(a) Schematic diagram and (b) line diagram of an NCL with two parallel risers

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Fig. 6

Temperature and quality variation along the length of the loop

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Fig. 2

Two different configurations of parallel risers: (a) single channel and (b) parallel channel (cases 1 and 2)

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Fig. 3

Comparison between a single-riser NCL with a two-riser NCL for case 1. (a) Variation of total mass flux through the loop with heat input, (b) variation of riser exit vapor quality with heat input, and (c) variation of total mass flux through the loop with exit vapor quality.

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Fig. 4

Comparison between a single-riser NCL with a two-riser NCL for case 2. (a) Variation of total mass flux through the loop with heat input, (b) variation of riser exit vapor quality with heat input, and (c) variation of total mass flux through the loop with exit vapor quality.

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Fig. 5

Comparison of prediction by HEM with (a) HEM with slip and (b) DFM

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Fig. 7

Effect of differential heating on the loop performance. (a) Variation of total mass flux through the loop, (b) variation of exit vapor quality of riser A, (c) variation of mass flux through riser A, (d) variation of frictional resistance in riser A, (e) variation of the ratio of mass flux through risers A and B, and (f) variation of single phase to two phase length in riser A.

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Fig. 8

Operating regime of the loop with differentially heated parallel risers

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