Energy characterisation of ultrasonic systems for industrial processes

Al-Juboori, Raed A. and Yusaf, Talal and Bowtell, Leslie and Aravinthan, Vasantha (2015) Energy characterisation of ultrasonic systems for industrial processes. Ultrasonics, 57. pp. 18-30. ISSN 0041-624X

Abstract

Obtaining accurate power characteristics of ultrasonic treatment systems is an important step towards their industrial scalability. Calorimetric measurements are most commonly used for quantifying the dissipated ultrasonic power. However, accuracy of these measurements is affected by various heat losses, especially when working at high power densities. In this work, electrical power measurements were conducted at all locations in the piezoelectric ultrasonic system equipped with 1/2 inch and 3/4 inch probes. A set of heat transfer calculations were developed to estimate the convection heat losses from the reaction solution. Chemical dosimeters represented by the oxidation of potassium iodide, Fricke solution and 4-nitrophenol were used to chemically correlate the effect of various electrical amplitudes and treatment regimes. This allowed estimation of sonochemical-efficiency (SE) and energy conversion (XUS) of the ultrasonic system. Results of this study showed overall conversion efficiencies of 60-70%. This correlated well with the chemical dosimeter yield curves of both organic and inorganic aqueous solutions. All dosimeters showed bubble shielding and coalescence effects at higher ultrasonic power levels, less pronounced for the 1/2 inch probe case. SE and XUS values in the range of 10-10 mol/J and 10-3 J/J respectively confirmed that conversion of ultrasonic power to chemical yield declined with amplitude.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright 2014 Elsevier B.V. Permanent restricted access to published version due to publisher copyright policy.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 06 Feb 2015 02:10
Last Modified: 24 Jun 2016 01:30
Uncontrolled Keywords: calorimetric techniques; convective heat loss; heat transfer; high power ultrasound; sonochemistry
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091305 Energy Generation, Conversion and Storage Engineering
09 Engineering > 0904 Chemical Engineering > 090403 Chemical Engineering Design
03 Chemical Sciences > 0302 Inorganic Chemistry > 030203 Inorganic Green Chemistry
12 Built Environment and Design > 1204 Engineering Design > 120404 Engineering Systems Design
Socio-Economic Objective: B Economic Development > 85 Energy > 8507 Energy Conservation and Efficiency > 850701 Commercial Energy Conservation and Efficiency
E Expanding Knowledge > 97 Expanding Knowledge > 970112 Expanding Knowledge in Built Environment and Design
Identification Number or DOI: 10.1016/j.ultras.2014.10.003
URI: http://eprints.usq.edu.au/id/eprint/26382

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