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Improved Aeration Using Perforated Venturi Throat of a Vertical Liquid Jet System with Downcomer

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

The performance of a vertical water jet system with a downcomer for bubble generation has been investigated experimentally. The aeration rate was controlled using perforated throat Venturi with 2, 4, 8, and 16 holes of 1 mm diameter each. Moreover, the bubble plume size and the Sauter mean diameter (SMD) were investigated by image processing obtained from a high-speed camera and a particle sizer algorithm. The void fraction and the entrained gas flow as a function of the liquid flow rate were also studied. A new correlation for the entrained gas flow rate as a function of the Froude number and the ratio of the perforation to throat area is proposed, with high accuracy. The effect of liquid flow on the bubble diameter was analysed for different levels of perforations using probability density function (PDF). The bubble penetration depth was also shown for different perforations at different liquid flow rates. The penetration depth increases significantly with the liquid superficial velocity. The Sauter mean diameter decreases linearly with the liquid superficial velocity as well as the void fraction. The results demonstrate an influence of the number of aspiration holes on the size of the bubbles generated such that the Sauter mean diameter increases with the increasing number of holes in the perforated section. The proposed controlled Venturi flow rate and confined plunging jet system technique is tested in this paper for the first time in the literature and shows considerable potential for controlling water aeration.

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Abbreviations

A Aeration :

The total cross section of the aspiration holes, m2

A Throat :

The cross section of the Venturi throat, m2

D :

The Venturi inlet and the downcomer pipe diameter, m

d 0 :

The Venturi throat diameter, m

d :

The air bubble diameter, m

g :

The acceleration of gravity

Q G :

Gas volumetric flow rate, m3/s

Q L :

Liquid volumetric flow rate, m3/s

U :

The liquid velocity in the Venturi throat, m/s

U lS :

Liquid superficial velocity, m/s

α :

The downcomer pipe inclination

β :

Throat-to-pipe diameter ratio; (d0/D)

ρ :

Density, kg/m3

µ :

Dynamic viscosity, kg.m/s

Re:

Reynolds number

Fr:

Froude number

G:

Gas

L:

Liquid

SMD:

Sauter mean diameter, mm

PDF:

Probability density function

FPS:

Frames per second

CP:

Conductance probe

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Authors and Affiliations

  1. Faculty of Mechanical and Process Engineering, University of Sciences and Technology Houari Boumedien, BP 32 El Alia, Bab Ezzouar, 16111, Algiers, Algeria

    Ammar Zeghloul & Nabil Ghendour

  2. Polytechnic National School, BP 182, El Harrach, 16200, Algiers, Algeria

    Ammar Zeghloul

  3. Department of Mechanical Engineering, Center for Integrated Petroleum Research, King Fahd University of Petroleum and Minerals, 31261, Dhahran, Saudi Arabia

    Abdelsalam Al-Sarkhi

Authors
  1. Ammar Zeghloul
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  2. Abdelsalam Al-Sarkhi
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  3. Nabil Ghendour
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Correspondence to Ammar Zeghloul.

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Zeghloul, A., Al-Sarkhi, A. & Ghendour, N. Improved Aeration Using Perforated Venturi Throat of a Vertical Liquid Jet System with Downcomer. Iran J Sci Technol Trans Mech Eng 48, 163–175 (2024). https://doi.org/10.1007/s40997-023-00655-9

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  • DOI: https://doi.org/10.1007/s40997-023-00655-9

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