Three-dimensional response of unrelaxed tension to instability of viscoelastic jets

NCUIR > Engineering College > Departmant of Mechanical Engineering > journal & Dissertation > Item 987654321/50272

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50272

Title:	Three-dimensional response of unrelaxed tension to instability of viscoelastic jets
Authors:	Ruo,AC;Chen,FL;Chung,CA;Chang,MH
Contributors:	機械工程學系
Keywords:	NEWTONIAN LIQUID JETS;FREE-SURFACE;BREAK-UP;ASYMMETRIC INSTABILITY;LINEAR-ANALYSIS;DRIVEN BREAKUP;CAPILLARY JET;ATOMIZATION;SIMULATION;STABILITY
Date:	2011
Issue Date:	2012-03-27 17:08:14 (UTC+8)
Publisher:	國立中央大學
Abstract:	Understanding the cause of instability of viscoelastic liquid jets is of fundamental importance to realise practical applications such as ink-jet printing, fuel injection spraying, and fibre spinning. For common viscoelastic fluids, the elastic stresses caused by the stretching of entangled polymeric chains at the nozzle can persist along the jet for a long downstream distance far away from the exit. Unrelaxed elastic tension has been regarded as a factor responsible for the delay in the breakup of viscoelastic jets. The present study performs a complete linear stability analysis to obtain deeper insights into the response of unrelaxed elastic tension to the onset of three-dimensional instability in viscoelastic jets. Results show that the elastic effect is multidimensional. In the absence of the unrelaxed tension, the elastic force, characterised by a Deborah number, has a slightly destabilising influence on both axisymmetric and non-axisymmetric disturbances. However, when the unrelaxed tension arises, the elastic force begins to suppress the instabilities driven by surface tension and the wind-induced effect to a great extent. In particular, once the tension exceeds a threshold, some novel oscillating non-axisymmetric modes emerge because of stimulation by the relaxation of the elastic energy, causing a variety of asymmetrical deformations.
Relation:	JOURNAL OF FLUID MECHANICS
Appears in Collections:	[Departmant of Mechanical Engineering ] journal & Dissertation

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