Adsorptive pressure-sensitive coatings for unsteady flow measurements

Norikazu Teduka, Masaharu Kameda, Keisuke Asai, Yutaka Amao, Kazuyuki Nakakita

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Time response of pressure-sensitive luminescent coatings has been investigated theoretically and experimentally. The present coating consists of a thin anodized aluminum layer and luminophores. The layer is formed onto the surface of pure aluminum by an electro-chemical process. The luminophores are absorbed onto the surface of the layer via chemical and physical adsorption. A method of making this coating is described in detail. The theoretical analysis shows that the effective diffusion coefficient for oxygen permeation in the anodized aluminum layer is up to 1×10-5 m2/s. This implies that the present coating should have the response time of the order of microseconds. For three kinds of luminophores, two porphyrin compounds and a ruthenium (II) complex, the response to a step change in pressure was studied using a pressure jump apparatus and a shock tube. It has been found that the response time of coating with tris(4,7-diphenylphenanthroline)ruthenium(II) ([Ru(dpp)3]2+) is longer than 20 μs, and depends on the thickness of anodized aluminum layer. On the other hand, tetrakis-(4-carboxyphenyl)porphyrin (TCPP) coating has the time response less than 10 μs, which is independent of the thickness of layer.

Original languageEnglish
Pages (from-to)1391-1399
Number of pages9
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume68
Issue number669
DOIs
Publication statusPublished - 2002 May

Keywords

  • Flow measurements
  • Flow visualization
  • Pressure distribution
  • Pressure-sensitive paint
  • Shock wave
  • Time response
  • Unsteady flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Adsorptive pressure-sensitive coatings for unsteady flow measurements'. Together they form a unique fingerprint.

Cite this