Abstract

Air jets obliquely incident on the surface of an object can produce sizable, localized, tangential forces. A MEMS-like system with tilted jets oriented in the four cardinal directions has been fabricated using extensions to printed circuit board technology. In this paper the fluid dynamic characteristics of the jets are reported. Jets approximately 1 mm in diameter are driven by pressure drops of ∼0.5 kPa. The shear stresses produced on an opposing wall (simulating a levitated object) are mapped both physically and in computational simulation. The shear stress distributions and the variations with pressure drop, channel height, jet diameter and jet tilt angle are reported.

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