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Research Papers: Nuclear Power

Effect of Experimental Conditions on Gas Core Length and Downward Velocity of Free Surface Vortex in Cylindrical Vessel

[+] Author and Article Information
Hideaki Monji

 University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba 305-8573, Japanmonji@kz.tsukuba.ac.jp

Tatsuya Shinozaki

 University of Tsukuba, 1-1-1 Ten-nodai, Tsukuba 305-8573, Japan

Hideki Kamide, Takaaki Sakai

 Japan Atomic Energy Agency, 4002 Narita, O-arai, Ibaraki 311-1393, Japan

J. Eng. Gas Turbines Power 132(1), 012901 (Sep 29, 2009) (8 pages) doi:10.1115/1.3078704 History: Received August 20, 2008; Revised September 11, 2008; Published September 29, 2009

This paper deals with characteristics of surface vortex in a cylindrical vessel. One of the characteristics is a gas core length, which is important to estimate the onset condition of the gas entrainment but influenced easily by the experimental condition. In the experiment using water, the effects of the water temperature, water level, and the surface tension on the gas core length were investigated. The onset condition of the gas entrainment is sometimes estimated by using the Burgers vortex model but the real flow in the vessel is different from the model. The velocity fields were measured by particle image velocimetry (PIV) and the velocity gradient of the downward flow was discussed. The proper flow conditions for the Burgers vortex model are a high water level and a high flow rate.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental apparatus

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Figure 2

Measurement area for longitudinal cross section by PIV

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Figure 3

Dye moving with the flow

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Figure 4

Effect of water temperature on gas core length

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Figure 5

Gas core length of various Reynolds numbers

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Figure 6

Effect of water level on gas core length: (a) flow rate dependence and (b) inlet velocity dependence

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Figure 7

Effect of surfactant on gas core length

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Figure 8

Detached bubble from the gas core: (a) water, (b)(1) water with surfactant (100 ppm), and (b)(2) water with surfactant (100 ppm)

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Figure 9

Velocity field on the longitudinal cross section (flow rate of 4.5 l/min): (a) magnitude of velocity and (b) velocity vectors (close-up of vortex)

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Figure 10

Velocity and circulation distribution along the radial direction: (a) circumferential velocity and (b) circulation

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Figure 11

Downward velocity distribution along the horizontal axis (flow rate of 4.5 l/min)

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Figure 12

Downward velocity distribution along the horizontal axis (flow rate of 6.0 l/min)

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Figure 13

Downward velocity distribution along the water depth, z: (a) left hand side and (b) right hand side

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Figure 14

Maximum downward velocity at the water depth based on the velocity fields measured by PIV

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Figure 15

Traveling speed of dye: (a) flow rate of 4.5 l/min and (b) flow rate of 7.8 l/min

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