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Cavitating flow through a micro-orifice

Jin, Zhi Jiang ; Gao, Zhi Xin ; Li, Xiao Juan and Qian, Jin Yuan LU (2019) In Micromachines 10(3).
Abstract

Microfluidic systems have witnessed rapid development in recent years. As one of the most common structures, the micro-orifice is always included inside microfluidic systems. Hydrodynamic cavitation in the micro-orifice has been experimentally discovered and is harmful to microfluidic systems. This paper investigates cavitating flow through a micro-orifice. A rectangular micro-orifice with a l/d ratio varying from 0.25 to 4 was selected and the pressure difference between the inlet and outlet varied from 50 to 300 kPa. Results show that cavitation intensity increased with an increase in pressure difference. Decreasing exit pressure led to a decrease in cavitation number and cavitation could be prevented by increasing the exit pressure.... (More)

Microfluidic systems have witnessed rapid development in recent years. As one of the most common structures, the micro-orifice is always included inside microfluidic systems. Hydrodynamic cavitation in the micro-orifice has been experimentally discovered and is harmful to microfluidic systems. This paper investigates cavitating flow through a micro-orifice. A rectangular micro-orifice with a l/d ratio varying from 0.25 to 4 was selected and the pressure difference between the inlet and outlet varied from 50 to 300 kPa. Results show that cavitation intensity increased with an increase in pressure difference. Decreasing exit pressure led to a decrease in cavitation number and cavitation could be prevented by increasing the exit pressure. In addition, the vapor cavity also increased with an increase in pressure difference and l/d ratio. Results also show the pressure ratio at cavitation inception was 1.8 when l/d was above 0.5 and the cavitation number almost remained constant when l/d was larger than 2. Moreover, there was an apparent difference in cavitation number depending on whether l/d was larger than 1.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cavitation, Computational fluid dynamics (CFD), Micro-orifice, Microchannel, Microfluidic system
in
Micromachines
volume
10
issue
3
article number
191
publisher
Multidisciplinary Digital Publishing Institute (MDPI)
external identifiers
  • pmid:30875944
  • scopus:85063595950
ISSN
2072-666X
DOI
10.3390/mi10030191
language
English
LU publication?
yes
id
9dcc7cef-b5c4-4ed2-990f-eccf9ba2e763
date added to LUP
2019-04-10 13:37:28
date last changed
2020-10-27 01:37:20
@article{9dcc7cef-b5c4-4ed2-990f-eccf9ba2e763,
  abstract     = {<p>Microfluidic systems have witnessed rapid development in recent years. As one of the most common structures, the micro-orifice is always included inside microfluidic systems. Hydrodynamic cavitation in the micro-orifice has been experimentally discovered and is harmful to microfluidic systems. This paper investigates cavitating flow through a micro-orifice. A rectangular micro-orifice with a l/d ratio varying from 0.25 to 4 was selected and the pressure difference between the inlet and outlet varied from 50 to 300 kPa. Results show that cavitation intensity increased with an increase in pressure difference. Decreasing exit pressure led to a decrease in cavitation number and cavitation could be prevented by increasing the exit pressure. In addition, the vapor cavity also increased with an increase in pressure difference and l/d ratio. Results also show the pressure ratio at cavitation inception was 1.8 when l/d was above 0.5 and the cavitation number almost remained constant when l/d was larger than 2. Moreover, there was an apparent difference in cavitation number depending on whether l/d was larger than 1.</p>},
  author       = {Jin, Zhi Jiang and Gao, Zhi Xin and Li, Xiao Juan and Qian, Jin Yuan},
  issn         = {2072-666X},
  language     = {eng},
  month        = {01},
  number       = {3},
  publisher    = {Multidisciplinary Digital Publishing Institute (MDPI)},
  series       = {Micromachines},
  title        = {Cavitating flow through a micro-orifice},
  url          = {http://dx.doi.org/10.3390/mi10030191},
  doi          = {10.3390/mi10030191},
  volume       = {10},
  year         = {2019},
}