非定常流計測のための吸着型感圧コーティング(流体工学, 流体機械)

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タイトル別名
  • Adsorptive Pressure-Sensitive Coatings for Unsteady Flow Measurements.
  • 非定常流計測のための吸着型感圧コーティング
  • ヒテイジョウリュウ ケイソク ノ タメ ノ キュウチャクガタ カンアツ コーティング

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抄録

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 adsorbed 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.

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