Analysis on the Dynamic Load in a Water Pool during Air Discharge from Submerged Sparger

[+] Author and Article Information
Ken Uchida, Takeshi Shimizu, Mitsuo Komuro

Power & Industrial Systems R&D Center, Toshiba Corporation, 8 Shinsugita-Cho, Isogo-Ku, Yokohama-Shi 235-8523, Japan

J. Pressure Vessel Technol 127(4), 495-501 (Apr 04, 2005) (7 pages) doi:10.1115/1.2043201 History: Received December 19, 2004; Revised April 04, 2005

This paper presents a study of the applicability of the VOF (volume of fluid) method to estimation of dynamic load in a water pool induced by oscillation of bubbles that are ejected through sparger holes. We choose the VOF method to simulate this phenomenon, and the pressure of a bubble is given by entropy change in order to consider the compressible effect of the bubble and the effect of gas coming into the bubble. In calculation of the airflow rate passing through the holes, the effect of two-phase pressure drop is incorporated. In order to investigate applicability of this method, a simplified blowdown test is carried out. According to the numerical results, the pressure-time history inside the sparger and that in a water pool are both generally reproduced well with analysis, except that the magnitude of first peak pressure in a water pool is overestimated. The most likely reason is that the bubble cloud has especially low void fraction at the early stage of bubble formation, and small bubbles around a major bubble work as a buffer, which is discussed, in detail, in this paper.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Experimental apparatus

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Figure 2

Schematic diagram of the test section

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Figure 3

Computational grid model

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Figure 4

Grid model used in preanalysis

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Figure 5

Pressure variation on the pipe wall

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Figure 6

Velocity vector at the holes

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Figure 7

Pressure-time history

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Figure 8

Pressure-time history from P4 (enlargement)

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Figure 9

Bubble shape (left: analysis, right: experiment)

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Figure 10

Conceptual diagram of bubble cloud



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