Dripping dynamics of Newtonian liquids from a tilted nozzle

Taur, A. and Doshi, P. and Yeoh, Hak Koon (2015) Dripping dynamics of Newtonian liquids from a tilted nozzle. European Journal of Mechanics B-Fluids, 51. pp. 8-15. ISSN 0997-7546, DOI https://doi.org/10.1016/j.euromechflu.2014.12.004.

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The dripping dynamics of Newtonian liquids emanating from an inclined nozzle is studied. The fluid viscosity mu flow rate Q, nozzle radius R, and inclination angle theta have been varied independently. The drop breakup times and the different modes of dripping have been identified using high speed imaging. A phase diagram showing the transition between the dripping modes for different theta is constructed in the (We, Ka) space, where We (Weber number) measures the relative importance of inertia to surface tension force and Ka (Kapitza number) measures the relative importance of viscous to surface tension forces. At low values of We and Ka, the system shows a transition from period-1 to limit cycle before chaos. The limit cycle region narrows down with increase in inclination. Further increase in the values of We and Ka gives a direct transition from period-1 to chaos. The new experiments reveal that in the period-1 region, increasing the nozzle inclination angle theta results in lowering of the drop breakup time t(b), suggesting that the surface tension forces cannot hold the drops longer despite the weakened effective gravitational pull. This counter-intuitive finding is further corroborated by pendant drop experiments and computations. More curiously, throughout the period-1 regime, the drop volume is independent of the flow rate. This resulted in a relatively simple correlation for the dimensionless drop volume V = 1.3G(-1)Ka(0.02)(cos theta)(0.37) accurate to within 10 over wide ranges of the independent variables. (C) 2014 Elsevier Masson SAS. All rights reserved.

Item Type: Article
Funders: This work was supported by FRGS grant FP059-2010B from the Ministry of Higher Education (Malaysia) and PPP grant PG091- 2012B from the University of Malaya. The authors thank the University of Malaya for sponsoring the visit of Dr. Pankaj Doshi to Malaysi
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Uncontrolled Keywords: Asymmetric dripping, Inclined nozzle, Breakup time, Drop volume, Phase, diagram, FREE-SURFACE FLOWS, DROP FORMATION, ELECTRIC-FIELD, FAUCET, BREAKUP, DISINTEGRATION, TECHNOLOGY, CAPILLARY, STABILITY, WEIGHT,
Subjects: T Technology > T Technology (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 25 Jul 2015 02:17
Last Modified: 04 Nov 2019 03:41
URI: http://eprints.um.edu.my/id/eprint/13800

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