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research-article

Hydrodynamic cavitation downstream a micro pillar entrained inside a microchannel - a parametric study

[+] Author and Article Information
Arash Nayebzadeh

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL, 32816
arash.nayebzadeh@knights.ucf.edu

Hanieh Tabkhi

Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL, 32816
hanieh.tabkhi@knights.ucf.edu

Yoav Peles

Fellow ASME, Department of Mechanical and Aerospace Engineering, University if Central Florida, Orlando, FL, 32816
yoav.peles@ucf.edu

1Corresponding author.

ASME doi:10.1115/1.4040374 History: Received January 05, 2018; Revised May 18, 2018

Abstract

Hydrodynamic cavitation downstream a range of micro pillar geometries entrenched in a microchannel were studied experimentally. Pressurized helium gas at the inlet tank and vacuum pressure at the outlet propelled distilled water through the device and trigger cavitation. The entire process from cavitation inception to the development of elongated attached cavity was recorded. Three modes of cavitation inception were observed and key parameters of cavitation processes, such as cavity length and angle of attachment, were compared among various micro pillar geometries. Cavitation downstream of a triangular micro pillar was found to have a distinct inception mode with relatively high cavitation inception numbers. After reaching its full elongated form, it prevailed through a larger system pressures and possessed the longest attached cavity. Cavity angle of attachments were predominantly related to the shape of the micro pillar. Micro pillars with sharp vertex led to lower cavity attachment angles close to the flow separation point while circular micro pillars resulted in higher angles. Twin circular micro pillars have a unique cavitation pattern that was affected by vortex shedding. Fast Fourier transformation (FFT) analysis of the cavity image intensity revealed transverse cavity shedding frequencies in various geometries and provided an estimation for vortex shedding frequencies.

Copyright (c) 2018 by ASME
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