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RESEARCH PAPERS

Stability of Single-Phase Natural Circulation With Inverted U-Tube Steam Generators

[+] Author and Article Information
J. Sanders

Commission of the European Communities, Joint Research Centre, Thermodynamics Division, LOBI Project, Ispra, Italy

J. Heat Transfer 110(3), 735-742 (Aug 01, 1988) (8 pages) doi:10.1115/1.3250553 History: Received December 10, 1986; Online October 20, 2009

Abstract

For natural circulation it is shown that parallel flow in the tubes of an inverted U-tube steam generator can be, at certain power levels, unstable. A mathematical model, based on one-dimensional Oberbeck-Boussinesq equations, shows that stability can be attained if in some tubes the water flows backward, opposite to the normal flow direction. The results are compared to measurements obtained from the natural circulation test A2-77A in the LOBI-MOD2 integral system test facility.

Copyright © 1988 by ASME
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