Opto-Microengines Rotated by Rarefied Gas Dynamic Effects.

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  • 希薄気体効果を用いた光マイクロエンジンに関する研究
  • キハク キタイ コウカ オ モチイタ ヒカリ マイクロ エンジン ニカンスルケ

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Abstract

Opto-microengines are proposed in this paper. The engines are composed of a vacuum chamber, microrotor and floodlight beam power supply or laser power supply. In the Knudsen number range from 0.05 to 5, the engines can be rotated by the effects of rarefied gas dynamics such as the force induced by a thermal creep flow and a radiometric force. It is revealed that the maximum torques of the engines occurred at the Knudsen numbers of about 0.2. The maximum rotational rate of the engines is achieved at the Knudsen number of 0.5. The effects are induced by heating of the rotor surface of the engine with a laser beam or floodlight beam. The Knudsen number is defined as the ratio of the mean free path length of a gas in the chamber to the rotor blade length of the engine in this paper.

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