Micro-orifice single-phase liquid flow: Pressure drop measurements and prediction

Andrea Cioncolini, Fabio Scenini*, Jonathan Duff

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


The dimensionless pressure drop was measured for six micro-orifices with diameters of 150. μm, 300. μm and 600. μm, and thickness ratios between 1.87 and 6.93. The experiments were carried out with water for orifice Reynolds number between 6000 and 25,000, thus extending the range covered in previous researches in turbulent flow conditions. The dimensionless pressure drop was found to be a weak decreasing function of the Reynolds number, and was found to be unaffected by the micro-orifice diameter ratio or thickness ratio. The static pressure profiles measured immediately downstream of the micro-orifices were flat, indicating that the vena contracta is located within the micro-orifice. A new prediction method for the dimensionless pressure drop in micro-orifices at high Reynolds number was developed using available data.

Original languageEnglish
Pages (from-to)33-40
Number of pages8
JournalExperimental Thermal and Fluid Science
StatePublished - 1 Jul 2015
Externally publishedYes


  • Dimensionless pressure drop
  • Discharge
  • Micro-fluidics
  • Micro-orifice
  • Resistance coefficient


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