Choked cavitation in micro-orifices: An experimental study

TY - JOUR

T1 - Choked cavitation in micro-orifices

T2 - An experimental study

AU - Cioncolini, Andrea

AU - Scenini, Fabio

AU - Duff, Jonathan

AU - Szolcek, Max

AU - Curioni, Michele

N1 - Publisher Copyright: © 2015 Elsevier Inc.

PY - 2016/6/1

Y1 - 2016/6/1

N2 - Choked cavitation was experimentally investigated with three circular micro-orifices with diameters of 150. μm and 300. μm and thicknesses of 1.04. mm, 1.06. mm and 1.93. mm. Water was used as the test fluid, and experiments were carried out with upstream pressures in the range of 5.1-13.5. MPa. The cavitation number at the inception and cessation of choked cavitation was found to increase with increasing the micro-orifice diameter and thickness. This suggests that micro-orifices could be characterized by very small choked cavitation numbers and therefore might be less susceptible to choking than their macro-scale counterparts. The cavitation number at the inception and cessation of choked cavitation was independent of the upstream pressure, downstream pressure, average flow velocity and orifice Reynolds number. At choking, the ratio of the upstream pressure to the downstream pressure is constant for a given micro-orifice, while during choked flow the mass flow rate through the micro-orifice is proportional to the square root of the upstream pressure.

AB - Choked cavitation was experimentally investigated with three circular micro-orifices with diameters of 150. μm and 300. μm and thicknesses of 1.04. mm, 1.06. mm and 1.93. mm. Water was used as the test fluid, and experiments were carried out with upstream pressures in the range of 5.1-13.5. MPa. The cavitation number at the inception and cessation of choked cavitation was found to increase with increasing the micro-orifice diameter and thickness. This suggests that micro-orifices could be characterized by very small choked cavitation numbers and therefore might be less susceptible to choking than their macro-scale counterparts. The cavitation number at the inception and cessation of choked cavitation was independent of the upstream pressure, downstream pressure, average flow velocity and orifice Reynolds number. At choking, the ratio of the upstream pressure to the downstream pressure is constant for a given micro-orifice, while during choked flow the mass flow rate through the micro-orifice is proportional to the square root of the upstream pressure.

KW - Cavitation

KW - Choked flow

KW - Discharge

KW - Micro-fluidics

KW - Micro-orifice

UR - http://www.scopus.com/inward/record.url?scp=84951056133&partnerID=8YFLogxK

U2 - 10.1016/j.expthermflusci.2015.12.004

DO - 10.1016/j.expthermflusci.2015.12.004

M3 - 文章

AN - SCOPUS:84951056133

SN - 0894-1777

VL - 74

SP - 49

EP - 57

JO - Experimental Thermal and Fluid Science

JF - Experimental Thermal and Fluid Science

ER -