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Research Papers: Fluid-Structure Interaction

Characteristics of the Suppression of Sloshing in a Vessel by a Bulkhead

[+] Author and Article Information
Nobuyuki Kobayashi

Department of Mechanical Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 2298558, Japankobanobu@me.aoyama.ac.jp

Masahiro Watanabe

Department of Mechanical Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, Kanagawa 2298558, Japanwatanabe@me.aoyama.ac.jp

Tomokazu Honda

Engineering Development Department, Honda Motor Co., Ltd., 4630 Shimotakanezawa, Haga, Tochigi 321-3321, Japantomokazu̱honda@n.t.rd.honda.co.jp

Katsunori Ohno

Imaging Products Operations Division, Seiko Epson Corp., 80 Harashinden, Hirooka, Shiojiri, Nagano 399-0706, Japanono.katsunori@exc.epson.co.jp

J. Pressure Vessel Technol 130(4), 041302 (Aug 20, 2008) (7 pages) doi:10.1115/1.2967828 History: Received November 07, 2006; Revised April 26, 2007; Published August 20, 2008

This paper investigates the characteristics of the suppression of sloshing in a vessel by a bulkhead that divides the vessel vertically into two sections but allows communication between two sections at the lower part of the vessel. The sloshing behavior is thus separated into a U-tube sloshing mode and a sloshing mode confined to each of the separated compartments. The effect of the aperture height beneath the bulkhead and the amplitude of the excitation on the characteristics of the suppression of the U-tube sloshing mode is investigated experimentally. As a result, the following phenomena are clarified. Three types of flow patterns were observed: flow pattern A, with unsteady vortices, flow pattern B, with a single swirl and a vortex, and flow pattern C, with twin swirls. The flow pattern changes from A to B or C as the amplitude of the excitation increases. The damping ratio with the bulkhead is much larger than that without the bulkhead. The damping generated by the bulkhead depends on the amplitude of the excitation. The flow pattern plays an important role in the dissipation of the energy of the sloshing. In particular, the vortices and swirls increase the rate of energy dissipation of the sloshing.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 8

Frequency response for several values of the aperture ratio, h∕H

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Figure 9

Effect of the aperture ratio, h∕H, on the maximum amplitude magnification, Amax∕X0

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Figure 7

Flow pattern C: photograph of flow pattern with twin swirls

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Figure 11

Effect of the aperture ratio, h∕H, on the natural frequency of sloshing with the bulkhead

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Figure 12

Frequency response for various values of the excitation amplitude ratio, X0∕H

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Figure 13

Effect of the excitation amplitude ratio, X0∕H, on the maximum amplitude magnification ratio, Amax∕X0

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Figure 14

Effect of the excitation amplitude ratio, X0∕H, on the damping ratio, ζ

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Figure 15

Maximum flow velocity, umax, as the function of the excitation amplitude ratio, X0∕H

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Figure 16

Damping ratio, ζ, as the function of the Reynolds number, ReH

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Figure 17

Maximum amplitude magnification, Amax∕X0, as the function of the Reynolds number, ReH

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Figure 18

Mechanism of energy dissipation

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Figure 6

Flow pattern B: photograph of flow pattern with a single swirl and a vortex

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Figure 5

Flow pattern A: photograph of flow pattern with a vortex

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Figure 4

Pattern phase diagram of fluid flow in vessel

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Figure 3

Experimental setup

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Figure 2

Sloshing mode of liquid in vessel. (a) Primary sloshing mode without bulkhead. (b) U-tube mode. (c) Sloshing mode in a separated vessel.

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Figure 1

Sloshing damage of the oil storage tank at Tokachi-Oki Earthquake 2003 (7)

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Figure 10

Effect of the aperture ratio, h∕H, on the damping ratio ζ

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