Chemical flow control method using combination of hydrophobic and hydrophilic coatings

Hirotaka Sakaue, Katsuaki Morita, Mineo Goto, Megumi Shimizu, Tsuyoshi Hyakutake, Hiroyuki Nishide

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A chemical flow control method using functional chemical is discussed. The method uses functional chemicals, which have hydrophobic and hydrophilic characteristics. A passive flow control of this method is shown by coating these chemicals separately on a control surface. Drop tests of an ogive shape model in water tower show that combinations of hydrophobic and hydrophilic coatings vary the speed in dropping direction by the maximum 22%. By controlling the coating area and coating location, intermediate speeds are obtained. As an active flow control, a temperature-sensitive micelle polymer is shown. This polymer is hydrophobic at higher temperature, while it is hydrophilic at lower temperature. The temperature range tested is from 25°C to 64°C. The rate of change in contact angle is ranged from 0.9 degree/°C to 1.6 degree/°C.

Original languageEnglish
Title of host publication46th AIAA Aerospace Sciences Meeting and Exhibit
Publication statusPublished - 2008
Event46th AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV
Duration: 2008 Jan 72008 Jan 10

Other

Other46th AIAA Aerospace Sciences Meeting and Exhibit
CityReno, NV
Period08/1/708/1/10

ASJC Scopus subject areas

  • Aerospace Engineering

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    Sakaue, H., Morita, K., Goto, M., Shimizu, M., Hyakutake, T., & Nishide, H. (2008). Chemical flow control method using combination of hydrophobic and hydrophilic coatings. In 46th AIAA Aerospace Sciences Meeting and Exhibit [2008-0632]