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Research Papers: Nuclear Power

A Comparative Study of Single-Phase, Two-Phase, and Supercritical Natural Circulation in a Rectangular Loop

[+] Author and Article Information
P. K. Vijayan, M. Sharma, D. S. Pilkhwal, D. Saha, R. K. Sinha

Reactor Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India

J. Eng. Gas Turbines Power 132(10), 102913 (Jul 07, 2010) (6 pages) doi:10.1115/1.4000866 History: Received July 28, 2009; Revised September 09, 2009; Published July 07, 2010; Online July 07, 2010

A one-dimensional theoretical model has been used to analyze the steady state and stability performance of a single-phase, two-phase, and supercritical natural circulation in a uniform diameter rectangular loop. Parametric influences of diameter, inlet temperature, and system pressure on the steady state and stability performance have been studied. In the single-phase liquid filled region, the flow rate is found to increase monotonically with power. On the other hand, the flow rate in two-phase natural circulation systems is found to initially increase, reach a peak, and then decrease with power. For the supercritical region also, the steady state behavior is found to be similar to that of the two-phase region. However, if the heater inlet temperature is beyond the pseudo critical value, then the performance is similar to single-phase loops. Also, the supercritical natural circulation flow rate decreases drastically during this condition. With an increase in loop diameter, the flow rate is found to enhance for all the three regions of operation. Pressure has a significant influence on the flow rate in the two-phase region, marginal effect in the supercritical region, and practically no effect in the single-phase region. With the increase in loop diameter, operation in the single-phase and supercritical regions is found to destabilize, whereas the two-phase loops are found to stabilize. Again, pressure has a significant influence on stability in the two-phase region.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

The loop considered for analysis

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Figure 2

Measured and predicted single-phase NC flow rate in a 14 mm inside diameter loop having the geometry given in Fig. 1

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Figure 3

Effect of loop diameter on steady state single-phase flow rate

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Figure 4

Schematic of two-phase loop considered for analysis

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Figure 5

Effect of loop diameter on two-phase NC flow at pressure of 70 bar

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Figure 6

Effect of pressure on two-phase NC flow

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Figure 7

Effect of loop diameter on steady state performance of two-phase loops with geometry given by Fig. 1

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Figure 8

Effect of pressure on steady state performance of a two-phase loop of 14 mm diameter with geometry given by Fig. 1

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Figure 9

Effect of loop diameter on steady state performance of supercritical loops

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Figure 10

Effect of pressure on the steady state performance of supercritical loops

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Figure 11

Effect of loop diameter on stability of single-phase loops

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Figure 12

Effect of loop diameter on stability of two-phase loops

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Figure 13

Effect of loop diameter on the stability of supercritical loops

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