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Research Papers: Nuclear Power

Experimental Study on Natural Circulation and Air-Injection Enhanced Circulation With Different Fluids

[+] Author and Article Information
W. Ambrosini

Dipartimento di Ingegneria Meccanica Nucleare e della Produzione, Università di Pisa, Via Diotisalvi 2, 56126 Pisa, Italywalter.ambrosini@ing.unipi.it

N. Forgione, F. Oriolo, E. Semeraro, M. Tarantino

Dipartimento di Ingegneria Meccanica Nucleare e della Produzione, Università di Pisa, Via Diotisalvi 2, 56126 Pisa, Italy

J. Eng. Gas Turbines Power 131(3), 032902 (Feb 13, 2009) (7 pages) doi:10.1115/1.3043819 History: Received August 08, 2008; Revised August 11, 2008; Published February 13, 2009

This paper reports on an experimental investigation on natural circulation and air-injection enhanced circulation performed adopting different fluids. This work is aimed at providing information on the basic mechanisms proposed in the design of future reactors relying on such circulation mechanisms for core cooling. Though the final objective of the research is the study of heavy metal cooling, the work is here limited to nonmetallic fluids. The working fluid adopted in past analyses was water. Further experimental campaigns were recently performed using the Novec™ HFE-7100 fluid, providing additional information on basic phenomena and the related scaling laws. The new fluid has a greater density and a greater thermal expansion coefficient with respect to water. Air was adopted for gas injection. Both natural circulation and gas-injection enhanced circulation are addressed in this work, drawing quantitative conclusions about the observed parametric trends. A systematic comparison is performed with the results obtained in previous experimental activities using water.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of the ANGIE experimental facility

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Figure 2

Typical evolution of flow rate measured by two different techniques for natural circulation tests (500 W, full open valve)

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Figure 3

Time evolution of flow rate at different powers and valve closure angles

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Figure 4

Time evolution of temperature difference between primary hot and cold leg fluid at different powers and valve closure angles

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Figure 5

Fluid flow rate as a function of heating power for present tests with HFE-7100 and previous tests with water

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Figure 6

Comparison between the values of natural circulation flow rate at different operating conditions for the two fluids

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Figure 7

Dimensionless representation of obtained results for natural circulation with full open valve

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Figure 8

Dimensionless representation of obtained results for natural circulation with different valve closure angles

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Figure 9

HFE-7100 flow rate as a function of injected air flow for the tests performed in this work at relatively low air-injection flow

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Figure 10

HFE-7100 flow rate as a function of injected air flow for the tests performed in this work at relatively high air-injection flow

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Figure 11

Flow pattern map and working points for the gas-injection enhanced circulation experiments performed in this work

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Figure 12

Comparison of flow rates of water and HFE-7100 from this work and previous experimental campaigns

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Figure 13

Comparison of superficial velocities for water and HFE-7100 from this work and previous experimental campaigns

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Figure 14

Representation of water and HFE-7100 data from natural circulation tests in dimensionless form

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Figure 15

Representation of water and HFE-7100 data from gas-injection enhanced circulation tests in dimensionless form

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