Accessible Requires Authentication Published by De Gruyter December 9, 2017

Experimental study on saturated boiling of two phase natural circulation under low pressure in narrow rectangular channels

Experimentelle Studie zum gesättigten Sieden des Zweiphasen-Naturumlaufs unter niedrigem Druck in schmalen rechteckigen Kanälen
Li Zi-chao, Qi Shi, Zhou Tao, Li Bing, Muhammad Ali Shahzad and Huang Yan-ping
From the journal Kerntechnik

Abstract

Saturated boiling of two-phase natural circulation has been experimentally investigated based on a natural circulation device with narrow rectangular channels. When heating power reaches a certain range, it is possible to observe the phenomenon of saturated boiling and flow pattern transition in the system. The results show the heat transfer coefficient of saturated boiling decreases with the increasing of pressure, heating power and size of narrow rectangle channels. The buoyancy force causing mixed convection decreases the heat transfer coefficient. Finally, a dimensionless number is introduced, which reflects length to width ratio of rectangular narrow section and Rayleigh number, in order to revise the presented correlation. All errors fall within the range of ±15%.

Kurzfassung

Gesättigtes Sieden des Zweiphasen-Naturumlaufs wurde auf der Basis einer Naturumlaufvorrichtung mit schmalen rechteckigen Kanälen experimentell untersucht. Bei entsprechender Wärmeleistung lässt sich in dem System das Phänomen des gesättigten Siedens und des Übergangs von Strömungsverhältnissen beobachten. Die Ergebnisse zeigen, dass der Wärmeübergangskoeffizient des gesättigten Siedens mit steigendem Druck, Wärmeleistung und Größe der schmalen rechteckigen Kanäle sinkt. Die Auftriebskraft, die gemischte Konvektion erzeugt, verringert den Wärmeübergangskoeffizient. Eine dimensionslose Zahl, die das Länge-zu-Weite Verhältnis der rechteckigen schmalen Abschnitte und die Rayleigh-Zahl wiedergibt, wird eingeführt, um die dargelegte Korrelation wiederzugeben. Alle Fehler liegen in einem Bereich von ±15%.


* Corresponding author: Qi Shi, Master, School of Nuclear science and engineering, North China Electric Power University. 102206, E-mail:

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Received: 2017-04-24
Published Online: 2017-12-09
Published in Print: 2017-12-18

© 2017, Carl Hanser Verlag, München