Influence of ultrasound power on acoustic streaming and micro-bubbles formations in a low frequency sono-reactor: Mathematical and 3D computational simulation

Sajjadi, B.; Abdul Raman, A.A.; Ibrahim, S. (2015) Influence of ultrasound power on acoustic streaming and micro-bubbles formations in a low frequency sono-reactor: Mathematical and 3D computational simulation. Ultrasonics Sonochemistry, 24. pp. 193-203. ISSN 1350-4177

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    Abstract

    This paper aims at investigating the influence of ultrasound power amplitude on liquid behaviour in a low-frequency (24 kHz) sono-reactor. Three types of analysis were employed: (i) mechanical analysis of micro-bubbles formation and their activities/characteristics using mathematical modelling. (ii) Numerical analysis of acoustic streaming, fluid flow pattern, volume fraction of micro-bubbles and turbulence using 3D CFD simulation. (iii) Practical analysis of fluid flow pattern and acoustic streaming under ultrasound irradiation using Particle Image Velocimetry (Ply). In mathematical modelling, a lone micro bubble generated under power ultrasound irradiation was mechanistically analysed. Its characteristics were illustrated as a function of bubble radius, internal temperature and pressure (hot spot conditions) and oscillation (pulsation) velocity. The results showed that ultrasound power significantly affected the conditions of hotspots and bubbles oscillation velocity. From the CFD results, it was observed that the total volume of the micro-bubbles increased by about 4.95 with each 100 W-increase in power amplitude. Furthermore, velocity of acoustic streaming increased from 29 to 119 cm/s as power increased, which was in good agreement with the PIV analysis. (C) 2014 Elsevier B.V. All rights reserved.

    Item Type: Article
    Creators:
    1. Sajjadi, B.(Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia)
    2. Abdul Raman, A.A.(Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MALAYSIA)
    3. Ibrahim, S.(Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, MALAYSIA)
    Journal or Publication Title: Ultrasonics Sonochemistry
    Additional Information: Sajjadi, Baharak Raman, Abdul Aziz Abdul Ibrahim, Shaliza eng Research Support, Non-U.S. Gov't Netherlands 2014/12/02 06:00 Ultrason Sonochem. 2015 May;24:193-203. doi: 10.1016/j.ultsonch.2014.11.013. Epub 2014 Nov 18.
    Uncontrolled Keywords: Ultrasound; Micro bubbles; Acoustic streaming; Computational Fluid Dynamics (CFD); Particle Image Velocimetry (PIV)
    Subjects: T Technology > T Technology (General)
    T Technology > TP Chemical technology
    Divisions: Faculty of Engineering
    Depositing User: Mr Jenal S
    Date Deposited: 03 Sep 2015 10:46
    Last Modified: 13 Sep 2017 15:59
    URI: http://eprints.um.edu.my/id/eprint/14009

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