Evolution of the design of Venturi devices for the delivery of dry particles to skin or mucosal tissue
The behaviour of bursting membrane devices, used to accelerate powder particles to velocities high enough to penetrate the skin, has been extensively studied at Oxford University. Over-expansion of a supersonic jet leads to flow separation, and powder concentrates in this separated jet [1,2]. Correctly expanded shock tube devices, which produce uniform gas velocities, require the powder to be delivered over a narrow time window (of order 0.2 ms) to be accelerated to maximum velocity. This paper reviews the evolution of devices designed to use the Venturi effect to entrain particles into a quasi-steady gas flow.
KeywordsMach Number Particle Image Velocimetry Parallel Section Computational Fluid Dynamic Result Swirl Ratio
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