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Vibration-induced droplet atomization.

Vukasinovic, Bojan.

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Vibration-induced droplet atomization.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Vibration-induced droplet atomization./
作者:	Vukasinovic, Bojan.
面頁冊數:	204 p.
附註:	Director: Ari Glezer.
Contained By:	Dissertation Abstracts International63-03B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3046942
ISBN:	0493612440

Vibration-induced droplet atomization.
Vukasinovic, Bojan.

Vibration-induced droplet atomization. - 204 p.

Director: Ari Glezer.

Thesis (Ph.D.)--Georgia Institute of Technology, 2002.

The atomization of liquid drops is investigated experimentally using laser vibrometry, high-speed imaging, and particle tracking techniques. The spray is generated by a novel vibration-induced droplet atomization (VIDA) process in which a sessile drop is atomized by an underlying vibrating thin metal diaphragm, resulting in rapid ejection of small secondary droplets from the free surface of the primary drop. Under some conditions, the primary drop can be atomized extremely rapidly by a bursting-like mechanism (e.g., a 0.1 ml water drop can be atomized in 0.4 seconds).

ISBN: 0493612440Subjects--Topical Terms:

783786
Engineering, Mechanical.

Vibration-induced droplet atomization.
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245 1 0 $a Vibration-induced droplet atomization.
300 $a 204 p.
500 $a Director: Ari Glezer.
500 $a Source: Dissertation Abstracts International, Volume: 63-03, Section: B, page: 1534.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2002.
520 $a The atomization of liquid drops is investigated experimentally using laser vibrometry, high-speed imaging, and particle tracking techniques. The spray is generated by a novel vibration-induced droplet atomization (VIDA) process in which a sessile drop is atomized by an underlying vibrating thin metal diaphragm, resulting in rapid ejection of small secondary droplets from the free surface of the primary drop. Under some conditions, the primary drop can be atomized extremely rapidly by a bursting-like mechanism (e.g., a 0.1 ml water drop can be atomized in 0.4 seconds).
520 $a The present research has focused on four major areas: global characteristics of VIDA process, instability modes and free surface dynamics of the forced drop, mechanisms of the interface breakup, and parametric characterization of the ensuing spray. Prior to atomization, the drop free surface undergoes three transitions: from axisymmetric standing waves to azimuthal waves, to a newly-observed lattice mode, and to a disordered pre-ejection state. The droplet ejection results from localized collapse of surface troughs and initiation and ultimate breakup of momentary liquid spikes. Breakup begins with capillary pinch-off from spike tips and can be followed by additional pinching of liquid droplets. For a relatively low-viscosity liquid, e.g., water, a capillary-wave instability of the spike is observed in some cases, while for a very viscous liquid, e.g., a glycerin/water solution, the first breakup occurs near the stem of the spike, with or without subsequent breakup of the detached, elongated thread. Different mechanisms dominating the primary breakup of the spike are operative in the low- and high-viscosity ejection regimes. When ejection of the secondary droplets is triggered, the evolution and rate of atomization depend on the coupled dynamics of the primary drop and the vibrating diaphragm. Due to these dynamics, the process can be either self-intensifying or self-decaying. The resulting VIDA spray is axisymmetric, with initial velocity comparable to the peak velocity of the diaphragm during steady operation. Active control of the spray velocity is achieved by modulation of the driving signal.
590 $a School code: 0078.
650 4 $a Engineering, Mechanical. $3 783786
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791 $a Ph.D.
792 $a 2002
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