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Experimental and numerical investigations on spray structure under the effect of cavitation phenomenon in a microchannel

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Abstract

In this study, the effect of upstream pressure on cavitation flows inside a microchannel with an inner diameter of 152 μm and resulting spray structure were experimentally and numerically investigated. The effects of bubble number density on two-phase flow hydrodynamics were studied using the numerical approach, where transient model was utilized to obtain the changes in vapor quality inside the microchannel and velocity field near the inlet and outlet of the nozzle. Spray visualization was carried out at a distance of 4.5 mm from the tip of the microchannel using the high speed visualization system. The experimental results showed that the spray cone angle increased with upstream pressure, and beyond the upstream pressure of 50 bar, the liquid jet flow changed to the cloudy spray flow. The bubble collapse was recorded at upstream pressures of 100 and 120 bar, where the cavitation bubbles extended to the outlet of the microchannel, and their collapse took place around the spray.

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Author information

Authors and Affiliations

  1. Mechatronics Engineering Program, Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul, Istanbul, 34956, Turkey

    Morteza Ghorbani, Abdolali Khalili Sadaghiani & Ali Koşar

  2. Faculty of Engineering and Natural Sciences, Advanced Composites & Polymer Processing Laboratory, Sabanci University, Tuzla, Istanbul, Istanbul, 34956, Turkey

    Mehmet Yidiz

  3. Center of Excellence for Functional Surfaces and Interfaces (EFSUN), Sabanci University, Tuzla, Istanbul, Istanbul, 34956, Turkey

    Ali Koşar

Authors
  1. Morteza Ghorbani
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  2. Abdolali Khalili Sadaghiani
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  3. Mehmet Yidiz
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  4. Ali Koşar
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Corresponding author

Correspondence to Ali Koşar.

Additional information

These authors contributed equally to this work.

Recommended by Associate Editor Simon Song

Morteza Ghorbani is a Ph.D. student working at Sabanci University under the supervision of Professor Ali Kosar. Prior to beginning the Ph.D. program, he worked as a Research Assistant at Tabriz University. His areas of interest are Cavitation, Multiphase flows in Micro channels, Flow Regimes in Nozzles and Study on Diesel Engines, Primary Breakup and Spray Characteristics.

Abdolali Khalili Sadaghiani is a Ph.D. student in the Faculty of Engineering and Natural Sciences at Sabanci University, Istanbul, Turkey. He received his M.Sc. degree in 2015 from Sabanci University, Istanbul. His research focuses on numerical and experimental studies of multiphase flows in microchannels. His research interests lie in micro-scale heat and mass transfer, phase change, thermal management and microfluidics.

Ali Kosar received his B.S. degree from Mechanical Engineering from Bogazici University, Istanbul. He pursued his graduate study in the Department of Mechanical Engineering at Rensselaer Polytechnic Institute, where he completed his M.S. and Ph.D. degrees. His research interests lie in micro/nano scale heat transfer and cavitation.

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Ghorbani, M., Sadaghiani, A.K., Yidiz, M. et al. Experimental and numerical investigations on spray structure under the effect of cavitation phenomenon in a microchannel. J Mech Sci Technol 31, 235–247 (2017). https://doi.org/10.1007/s12206-016-1226-y

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  • DOI: https://doi.org/10.1007/s12206-016-1226-y

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