Vaporization and nucleation on microheater in microchannel with nozzle

Koji Takahashi, Hirofumi Sakai, Kunihito Nagayama, Akihito Baba, Kenji Makihira, Tanemasa Asano

Research output: Contribution to conferencePaper

2 Citations (Scopus)

Abstract

A vaporization microchamber is fabricated by the MEMS technology in order to improve and check the concept of vaporizing liquid microthruster for nanosatellite. This chamber is a part of microchannel with 2-10 micrometers height made by silicon and glass substrates. Nozzle is fabricated in silicon just above a thin film ITO heater deposited on glass. Liquid propellant is repetitively pulse-heated by the heater and the flow pattern is recorded thorough glass and ITO by high-speed video camera. Four types of flow patterns are found depending on the employed voltage, pulse width and frequency. For example, large heat flux per pulse of high frequency does not allow the liquid to fill the chamber. Even with lower heat flux, no droplet emission from the nozzle is observed because the nozzle itself is heated enough in this geometry. The nanoscale cavity or roughness on heating surface is found to play an important role for the nucleation in microchannel. The preferable thermal design for microthruster is also discussed.

Original languageEnglish
DOIs
Publication statusPublished - 2001
Event35th AIAA Thermophysics Conference 2001 - Anaheim, CA, United States
Duration: Jun 11 2001Jun 14 2001

Other

Other35th AIAA Thermophysics Conference 2001
CountryUnited States
CityAnaheim, CA
Period6/11/016/14/01

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

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    Takahashi, K., Sakai, H., Nagayama, K., Baba, A., Makihira, K., & Asano, T. (2001). Vaporization and nucleation on microheater in microchannel with nozzle. Paper presented at 35th AIAA Thermophysics Conference 2001, Anaheim, CA, United States. https://doi.org/10.2514/6.2001-3075