This paper experimentally investigates the mechanism of water droplet detachment in a confined microchannel under highly inertial (10 < Re < 200) air flow conditions. Experimental observations show that as the Reynolds number of the continuous phase is increased, the droplet transitions from an elongated slug to a nearly uniform aspect ratio droplet. Supporting scaling arguments are then made that examine the relevant forces induced by the continuous phase on the droplet at the point of detachment. The inertial, viscous, and hydrodynamic pressure forces that result as the air flow is confined in the small gap between droplet and channel walls are compared to the surface tension force pinning the droplet at the injection site. The results indicate that the dominant detachment mechanism transitions from the hydrostatic pressure difference to inertial drag as the continuous phase velocity is increased.
Droplet Detachment Mechanism in a High-Speed Gaseous Microflow
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received Juy 27, 2012; final manuscript received March 14, 2013; published online May 17, 2013. Assoc. Editor: Ali Beskok.
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Carroll, B., and Hidrovo, C. (May 17, 2013). "Droplet Detachment Mechanism in a High-Speed Gaseous Microflow." ASME. J. Fluids Eng. July 2013; 135(7): 071206. https://doi.org/10.1115/1.4024057
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