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Anomalies detected during hydrodynamic cavitation when using salicylic acid dosimetry to measure radical production
Zupanc, Mojca (Author), Petkovšek, Martin (Author), Zevnik, Jure (Author), Kozmus, Gregor (Author), Šmid, Alenka (Author), Dular, Matevž (Author)

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Abstract
Cavitation used to be associated with negative outcomes in hydraulic turbomachinery but nowadays it is often used for water cleaning, microorganism's destruction and degradation of organic compounds. This study investigated the amount of OH formed during hydrodynamic cavitation using salicylic acid dosimetry. The radical's amount was evaluated by quantifying the concentration of 2,3-dihydroxybenzoic acid, catechol and 2,5-dihydroxybenzoic acid. Two concentrations of the dosimeter in tap water were investigated, 50 and 300 mg L-1 (pH approx. 2.5). After 90 min of cavitation using a Venturi constriction a sum of the three products was determined at 0.97 ug mL-1 and 1.81 ug mL-1, respectively. However, during the investigation the anomalies were detected in the cavitation development when higher concentration of salicylic acid was used - cavitation appeared more gentle, with less intense collapses, unrelated to the one in pure water. Detailed observations of cavitation and additional bubble dynamics simulations revealed that the decreased surface tension of the acidified salicylic acid solution is the most influential physical characteristic. Further experiments on nucleation and coalescence showed that high concentration of salicylic acid also leads to longer stability of the bubbles and prevents their coalescence due to short-range repulsive forces (steric hindrance), which results in less violent bubble collapse. We also discuss the importance of an appropriate amount of the dosimeter for correct evaluation of OH production in a given cavitation device (50 mg L-1 for the present one). This is essential for further cavitation exploitation studies to avoid false interpretation of the gathered results.

Language:English
Keywords:cavitation, nucleation, coalescence
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2020
Number of pages:str. 1-11
Numbering:Vol. 396
UDC:532.528(045)
ISSN on article:1385-8947
DOI:10.1016/j.cej.2020.125389 Link is opened in a new window
COBISS.SI-ID:15039491 Link is opened in a new window
Views:281
Downloads:213
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Record is a part of a journal

Title:Chemical engineering journal
Shortened title:Chem. eng. j.
Publisher:Elsevier Sequoia
ISSN:1385-8947
COBISS.SI-ID:2110998 This link opens in a new window

Document is financed by a project

Funder:EC - European Commission
Funding Programme:H2020
Project no.:771567
Name:An investigation of the mechanisms at the interaction between cavitation bubbles and contaminants
Acronym:CABUM

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P2-0401
Name:Energetsko strojništvo

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P1-0208
Name:Farmacevtska kemija: načrtovanje, sinteza in vrednotenje učinkovin

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:J7-1814
Name:Kavitacija - rešitev za problematiko mikroplastike?

Secondary language

Language:Slovenian
Keywords:kavitacija, nukleacija, koalescenca

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