Search results for: Matevž Dular

Items from 1 to 20 out of 30 results

article

Computational analysis of flow conditions in hydrodynamic cavitation generator for water treatment processes

Jurij Gostiša, Primož Drešar, Marko Hočevar, Matevž Dular

The Canadian Journal of Chemical Engineering > 100 > 12 > 3502 - 3516

The research on the potential of cavitation exploitation is currently an extremely interesting topic. To reduce the costs and time of the cavitation reactor optimization, nowadays, experimental optimization is supplemented and even replaced using computational fluid dynamics (CFD). One of the approaches towards sustainable water treatment is the use of the cavitation reactor with bluff elements mounted...

article

Liposome destruction by hydrodynamic cavitation in comparison to chemical, physical and mechanical treatments

Žiga Pandur, Iztok Dogsa, Matevž Dular, David Stopar

Ultrasonics Sonochemistry > 2020 > 61 > C

Liposomes are widely applied in research, diagnostics, medicine and in industry. In this study we show for the first time the effect of hydrodynamic cavitation on liposome stability and compare it to the effect of well described chemical, physical and mechanical treatments. Fluorescein loaded giant 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) lipid vesicles were treated with hydrodynamic cavitation...

article

Observing the thermodynamic effects in cavitating flow by IR thermography

Martin Petkovšek, Matevž Dular

Experimental Thermal and Fluid Science > 2017 > 88 > C > 450-460

When dealing with liquid flows, where operating temperature gets close to the liquid critical temperature, cavitation cannot be assumed as an isothermal phenomenon. Due to the relatively high density of vapor, the thermodynamic effect (decrease of temperature in the bulk liquid due to latent heat flow) becomes considerable and should not be neglected. For applications like pumping cryogenic fuel and...

article

Non-contact method for analysis of cavitating flows

Ignacijo Biluš, Benjamin Bizjan, Luka Lešnik, Brane Širok, more

Ultrasonics > 2017 > 81 > C > 178-186

This paper presents a novel non-contact method for simultaneous analysis of pressure and velocity conditions in cavitating flows. The method (implemented in our software ADMflow) is based on high-speed camera flow visualization and was evaluated in an experiment with ultrasonically induced acoustic cavitation of different intensities. Attached cavitation with clearly visible cavitation structures...

article

Efficient inactivation of MS-2 virus in water by hydrodynamic cavitation

Janez Kosel, Ion Gutiérrez-Aguirre, Nejc Rački, Tanja Dreo, more

Water Research > 2017 > 124 > C > 465-471

The aim of this study was to accurately quantify the impact of hydrodynamic cavitation on the infectivity of bacteriophage MS2, a norovirus surrogate, and to develop a small scale reactor for testing the effect of hydrodynamic cavitation on human enteric viruses, which cannot be easily prepared in large quantities. For this purpose, 3 mL scale and 1 L scale reactors were constructed and tested. Both...

article

On the bubble-surfactant interaction

Tadej Stepišnik Perdih, Brane Širok, Matevž Dular

Chemical Engineering and Processing: Process Intensification > 2017 > 121 > C > 198-204

Surfactants play an important role in numerous chemical applications. Their effects on dispersion systems, as emulsions and colloids, are vastly studied. Yet, the dissolution (kinetics) of surfactants themselves has not received much scientific attention, despite the high implications for industrial applications. Nevertheless one can acknowledge the rapid growth of new technologies which are being...

article

Image post-processed approaches for cavitating flow in orifice plate

Yong Wang, Suguo Zhuang, Houlin Liu, Zhenjiang Zhao, more

Journal of Mechanical Science and Technology > 2017 > 31 > 7 > 3305-3315

A comprehensive investigation on cavitating flow and cavitation-induced erosion was performed experimentally in an orifice plate system. Three image post-processed approaches were applied to analyze the test data, in order to obtain the cavitation characteristics. The cavitating flow pattern was studied by high speed images. In one cavitation developing period, there could be three distinct cavitation...

article

The issue of cavitation number value in studies of water treatment by hydrodynamic cavitation

Andrej Šarc, Tadej Stepišnik-Perdih, Martin Petkovšek, Matevž Dular

Ultrasonics Sonochemistry > 2017 > 34 > C > 51-59

Within the last years there has been a substantial increase in reports of utilization of hydrodynamic cavitation in various applications. It has came to our attention that many times the results are poorly repeatable with the main reason being that the researchers put significant emphasis on the value of the cavitation number when describing the conditions at which their device operates.In the present...

article

Close-range air-assisted precision spot-spraying for robotic applications: Aerodynamics and spray coverage analysis

Aleš Malneršič, Matevž Dular, Brane Širok, Roberto Oberti, more

Biosystems Engineering > 2016 > 146 > C > 216-226

Orchards and grapevines are currently sprayed overall. Most bush and tree crop sprayers use airflow assistance which generates movements in canopy exposing both sides of the leaves to the spray. Also, large coherent vortices are formed further contributing to improved spray coverage. A new close-range air-assisted spot-spraying method for the selective treatments of disease foci is evaluated here...

article

Use of hydrodynamic cavitation in (waste)water treatment

Matevž Dular, Tjaša Griessler-Bulc, Ion Gutierrez-Aguirre, Ester Heath, more

Ultrasonics Sonochemistry > 2016 > 29 > C > 577-588

The use of acoustic cavitation for water and wastewater treatment (cleaning) is a well known procedure. Yet, the use of hydrodynamic cavitation as a sole technique or in combination with other techniques such as ultrasound has only recently been suggested and employed.In the first part of this paper a general overview of techniques that employ hydrodynamic cavitation for cleaning of water and wastewater...

article

Hydrodynamic cavitation damage in water at elevated temperatures

Matevž Dular

Wear > 2016 > 346-347 > C > 78-86

In the present study we show experimental campaign where cavitation erosion in water at different temperatures was investigated. In contrary to other studies, where cavitation is generated by ultrasound, we employed hydrodynamic cavitation, which more closely resembles the conditions in applications – it is known that the results obtained by ultrasonic cavitation can be misleading. The tests were...

article

On the mechanisms of cavitation erosion – Coupling high speed videos to damage patterns

Matevž Dular, Martin Petkovšek

Experimental Thermal and Fluid Science > 2015 > 68 > Complete > 359-370

Recently van Rijsbergen et al. (2012), by simultaneous observation of cavitation and acoustic emission measurements, and Petkovsek and Dular (2013), by simultaneous observation of both cavitation structures and cavitation damage, have pointed to the fact that the small scale structures and the topology of the cavitation clouds play a significant role in cavitation erosive potential. Despite the two,...

article

A novel rotation generator of hydrodynamic cavitation for waste-activated sludge disintegration

Martin Petkovšek, Matej Mlakar, Marjetka Levstek, Marjeta Stražar, more

Ultrasonics - Sonochemistry > 2015 > 26 > Complete > 408-414

The disintegration of raw sludge is very important for enhancement of the biogas production in anaerobic digestion process as it provides easily degradable substrate for microorganisms to perform maximum sludge treatment efficiency and stable digestion of sludge at lower costs. In the present study the disintegration was studied by using a novel rotation generator of hydrodynamic cavitation (RGHC)...

article

Modeling cavitation in a rapidly changing pressure field – Application to a small ultrasonic horn

Anton Žnidarčič, Robert Mettin, Matevž Dular

Ultrasonics - Sonochemistry > 2015 > 22 > Complete > 482-492

Ultrasonic horn transducers are frequently used in applications of acoustic cavitation in liquids. It has been observed that if the horn tip is sufficiently small and driven at high amplitude, cavitation is very strong, and the tip can be covered entirely by the gas/vapor phase for longer time intervals. A peculiar dynamics of the attached cavity can emerge with expansion and collapse at a self-generated...

article

Shear-induced hydrodynamic cavitation as a tool for pharmaceutical micropollutants removal from urban wastewater

Mojca Zupanc, Tina Kosjek, Martin Petkovšek, Matevž Dular, more

Ultrasonics - Sonochemistry > 2014 > 21 > 3 > 1213-1221

In this study, the removal of clofibric acid, ibuprofen, naproxen, ketoprofen, carbamazepine and diclofenac residues from wastewater, using a novel shear-induced cavitation generator has been systematically studied. The effects of temperature, cavitation time and H ₂ O ₂ dose on removal efficiency were investigated. Optimisation (50°C; 15min; 340mgL ⁻¹ of added H ₂ ...

article

IR measurements of the thermodynamic effects in cavitating flow

Martin Petkovšek, Matevž Dular

International Journal of Heat and Fluid Flow > 2013 > 44 > Complete > 756-763

The understanding of the thermodynamic effects of cavitating flow is crucial for applications like turbopumps for liquid hydrogen LH2 and oxygen LOx in space launcher engines. Experimental studies of this phenomenon are rare as most of them were performed in the 1960s and 1970s. The present study presents time resolved IR (Infra-Red) measurements of thermodynamic effects of cavitating flow in a Venturi...

article

Rotation generator of hydrodynamic cavitation for water treatment

Martin Petkovšek, Mojca Zupanc, Matevž Dular, Tina Kosjek, more

Separation and Purification Technology > 2013 > 118 > Complete > 415-423

Nowadays, due to lack of freshwater resources a sufficient wastewater management is an environmental concern. This global issue is resulting in the rapid growth of technologies for wastewater treatment. In this study a novel rotation generator of hydrodynamic cavitation is presented, which is used as a tool for pharmaceuticals removal in water. On presented machine analysis of hydrodynamics is made,...

article

Removal of pharmaceuticals from wastewater by biological processes, hydrodynamic cavitation and UV treatment

Mojca Zupanc, Tina Kosjek, Martin Petkovšek, Matevž Dular, more

Ultrasonics - Sonochemistry > 2013 > 20 > 4 > 1104-1112

To augment the removal of pharmaceuticals different conventional and alternative wastewater treatment processes and their combinations were investigated. We tested the efficiency of (1) two distinct laboratory scale biological processes: suspended activated sludge and attached-growth biomass, (2) a combined hydrodynamic cavitation–hydrogen peroxide process and (3) UV treatment. Five pharmaceuticals...

article

Observations of cavitation erosion pit formation

Matevž Dular, Olivier Coutier Delgosha, Martin Petkovšek

Ultrasonics - Sonochemistry > 2013 > 20 > 4 > 1113-1120

Previous investigations showed that a single cavitation bubble collapse can cause more than one erosion pit (Philipp & Lauterborn [1]). But our preliminary study showed just the opposite – that in some cases a single cavitation pit can result from more than one cavitation event. The present study shows deeper investigation of this phenomenon. An investigation of the erosion effects of ultrasonic...

article

Simultaneous observation of cavitation structures and cavitation erosion

Martin Petkovšek, Matevž Dular

Wear > 2013 > 300 > 1-2 > 55-64

Despite a large ensemble of works on the relationship between the macroscopic cavitation structures and their erosive potential a study that would link individual cavitation events with specific damage has not yet been made.In the present study we attached a thin aluminum foil to the surface of a transparent Venturi section using two sided transparent adhesive tape. The surface was very soft-prone...

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INFONA - science communication portal

Search results for: Matevž Dular

Computational analysis of flow conditions in hydrodynamic cavitation generator for water treatment processes

Liposome destruction by hydrodynamic cavitation in comparison to chemical, physical and mechanical treatments

Observing the thermodynamic effects in cavitating flow by IR thermography

Non-contact method for analysis of cavitating flows

Efficient inactivation of MS-2 virus in water by hydrodynamic cavitation

On the bubble-surfactant interaction

Image post-processed approaches for cavitating flow in orifice plate

The issue of cavitation number value in studies of water treatment by hydrodynamic cavitation

Close-range air-assisted precision spot-spraying for robotic applications: Aerodynamics and spray coverage analysis

Use of hydrodynamic cavitation in (waste)water treatment

Hydrodynamic cavitation damage in water at elevated temperatures

On the mechanisms of cavitation erosion – Coupling high speed videos to damage patterns

A novel rotation generator of hydrodynamic cavitation for waste-activated sludge disintegration

Modeling cavitation in a rapidly changing pressure field – Application to a small ultrasonic horn

Shear-induced hydrodynamic cavitation as a tool for pharmaceutical micropollutants removal from urban wastewater

IR measurements of the thermodynamic effects in cavitating flow

Rotation generator of hydrodynamic cavitation for water treatment

Removal of pharmaceuticals from wastewater by biological processes, hydrodynamic cavitation and UV treatment

Observations of cavitation erosion pit formation

Simultaneous observation of cavitation structures and cavitation erosion

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