Discussion on measurement mechanism of pressure-sensitive paints

Hiroki Yamaguchi, yu Matsuda, Hideo Mori, Tomohide Niimi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The pressure-sensitive paint (PSP) is a very useful tool to measure pressure distributions on surfaces. In general, a measured pressure distribution by the paint shows good agreement with that by pressure taps. The paint is considered to represent the thermodynamic pressure. Recently, the paint has been adopted to rarefied gas flows and micro/nanoflows, i.e. high Knudsen number regime, and exhibited feasibility of pressure measurement in wide range of flows. In this study, we have discussed the physical meaning of luminescent intensity emitted from the paint through high Knudsen number regime measurements. It is known that a pressure tap shows good agreement with surface pressure and not with thermodynamic pressure in this regime, because of the temperature jump. High Knudsen number flow is required to be treated as a molecular flow; thus we discussed the PSP measurement mechanism by the molecular kinetic theory. The pressure profile of PSP was examined by a DSMC numerical result, and it was verified that PSP indicates the surface pressure. The temperature sensitivity was also investigated analytically in detail in continuum flow regime to discuss the suggestion that "PSP measures pressure, not density" [H. Bell, E.T. Schairer, L.A. Hand, R.D. Mehta, Surface pressure measurements using luminescent coatings, Annu. Rev. Fluid Mech. 33 (2001) 155-206]. From these analyses, however, we suggest that PSP measures a number flux of oxygen molecules toward the surface. The effect of a macroscopic flow against PSP in high Knudsen number flow is also discussed.

Original languageEnglish
Pages (from-to)224-229
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume142
Issue number1
DOIs
Publication statusPublished - 2009 Oct 12
Externally publishedYes

Fingerprint

pressure sensitive paints
Paint
Knudsen flow
paints
taps
pressure measurement
pressure distribution
continuum flow
molecular flow
thermodynamics
Pressure measurement
rarefied gases
Pressure distribution
kinetic theory
bells
luminous intensity
suggestion
gas flow
Thermodynamics
Kinetic theory

Keywords

  • High Knudsen number flow
  • Number flux
  • Pressure-sensitive paint
  • Surface pressure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Discussion on measurement mechanism of pressure-sensitive paints. / Yamaguchi, Hiroki; Matsuda, yu; Mori, Hideo; Niimi, Tomohide.

In: Sensors and Actuators, B: Chemical, Vol. 142, No. 1, 12.10.2009, p. 224-229.

Research output: Contribution to journalArticle

Yamaguchi, Hiroki ; Matsuda, yu ; Mori, Hideo ; Niimi, Tomohide. / Discussion on measurement mechanism of pressure-sensitive paints. In: Sensors and Actuators, B: Chemical. 2009 ; Vol. 142, No. 1. pp. 224-229.
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