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Research Papers: Multiphase Flows

Development of Venturi-Tube With Spiral-Shaped Fin for Water Treatment

[+] Author and Article Information
Dong Ho Shin

Center for Urban Energy Research,
Korea Institute of Science and Technology,
Hwarangno 14-gil 5, Seongbuk-gu,
Seoul 02792, South Korea
e-mail: shindh@kist.re.krF

Yeonghyeon Gim

School of Mechanical Engineering,
Sungkyunkwan University,
2066, Seobu-ro, Jangan-gu,
Suwon 16419, South Korea
e-mail: mpmpmpp6@gmail.com

Dong Kee Sohn

School of Mechanical Engineering,
Sungkyunkwan University,
2066, Seobu-ro, Jangan-gu,
Suwon 16419, South Korea
e-mail: dksohn@skku.edu

Han Seo Ko

School of Mechanical Engineering,
Sungkyunkwan University,
2066, Seobu-ro, Jangan-gu,
Suwon 16419, South Korea
e-mail: hanseoko@skku.edu

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 13, 2018; final manuscript received January 31, 2019; published online March 4, 2019. Assoc. Editor: Moran Wang.

J. Fluids Eng 141(5), 051303 (Mar 04, 2019) (9 pages) Paper No: FE-18-1264; doi: 10.1115/1.4042750 History: Received April 13, 2018; Revised January 31, 2019

Detailed numerical data were presented for the development of a venturi-type water purifier which had a cavitation nozzle to enhance turbulent kinetic energy and vapor volume fraction. Numerical analysis for cavitation was conducted in multiphase flow using the software, cfx. The numerical method used in this study was verified by the experimental data of pressure distribution in tube and the observation of cavitation from previous studies. From the result of the numerical analysis, a logarithmic relation between the vapor volume fraction and volume flow rate of water according to the area ratio between the throat and the entrance of a venturi-tube was derived. In addition, spiral-shaped fins were developed to enhance the turbulent kinetic energy in the body of a venturi-tube. Thus, it was confirmed that the volume fraction and turbulent kinetic energy of the developed water purifier were enhanced compared with the normal venturi-tube without the spiral-shaped fin. Finally, the improved water treatment performance of the advanced design of the venturi-tube was confirmed by the removal test of the representative solutions.

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Figures

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Fig. 5

Nondimensional inlet pressure according to diameter and length of throat

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Fig. 4

Volume fraction of water vapor in the case of the water velocity at the throat of 15.9 m/s

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Fig. 3

Verification of CFD results with pressure data reported by Hu et al. [15]

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Fig. 2

Numerical result of pressure distribution inside venturi-tube

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Fig. 1

Schematic diagram of analyzed model: (a) whole schematic diagram, (b) front view, and (c) isometric view

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Fig. 6

Volume fraction and augmentation factor according to A*

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Fig. 7

Vapor volume fraction for A* of (a) 10 and (b) 4

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Fig. 8

Turbulent kinetic energy induced by leading edges

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Fig. 9

Velocity streamline of water flow

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Fig. 10

Velocity vector of water flow

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Fig. 11

Turbulent kinetic energy and augmentation factor according to N/(R*·L*)

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Fig. 12

Experimental apparatus of venturi-tube with spiral-fin: (a) front view and (b) side view

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Fig. 13

Removal ratio of rhodamine B by time according to volume flow rate

Tables

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