Intensification of sonochemical reactions in solid-liquid systems under fully suspended condition

Stoian, D, Eshtiaghi, N, Wu, J and Parthasarathy, R 2018, 'Intensification of sonochemical reactions in solid-liquid systems under fully suspended condition', Chemical Engineering and Processing: Process Intensification, vol. 123, pp. 34-44.

Document type: Journal Article
Collection: Journal Articles

Title Intensification of sonochemical reactions in solid-liquid systems under fully suspended condition
Author(s) Stoian, D
Eshtiaghi, N
Wu, J
Parthasarathy, R
Year 2018
Journal name Chemical Engineering and Processing: Process Intensification
Volume number 123
Start page 34
End page 44
Total pages 11
Publisher Elsevier
Abstract Process intensification of sonochemical reactions due to the addition of solids is studied using very high solids concentrations (up to 0.5 (v/v)). The impacts of particle size, surface roughness, and solids concentration on sonochemical yields were studied experimentally by measuring the concentration of I 3 - formed in the cavitation of potassium iodide solution in an agitated baffled tank fitted with an ultrasonic generator (20 kHz, 131 W). Solids used were cation exchange resin (625 μm), sand (303 μm), and spherical glass beads (207, 551 and 1290 μm). It was found that, due to the net effect of wave attenuation and increased number of nucleation sites available, cavitation level initially decreases with increasing solids concentration up to 0.1 (v/v), then increases up to 0.4 (v/v), followed by a further decrease. Cavitation activity increases with increasing particle diameter due to the reduction in the liquid tensile strength in the presence of larger particles, which decrease the cavitation threshold. The cavitation level is found to be enhanced due to an increase in the surface roughness. The results imply that particle size, concentration, and surface roughness all play important roles in the formation and subsequent collapse of cavities, which cumulatively influence sonochemical reaction yields.
Subject Acoustics and Acoustical Devices; Waves
Keyword(s) Cavitation
Particle concentration
Particle size
Sonochemical yield
Surface roughness
DOI - identifier 10.1016/j.cep.2017.10.025
ISSN 0255-2701
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