NDLI: Exploiting the Confined Twin-Jet Instability for Micro Mixing Enhancement

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nahum, Assaf Seifert, Avraham
Copyright Year	2004
Abstract	A method for exploiting hydrodynamic instability for enhancement of micro-mixing is proposed, studied numerically and demonstrated experimentally. The confined twin-jet geometry is selected as the baseline unstable flow, since it undergoes a Hopf bifurcation at low Reynolds numbers. It is shown that by adding weak fluidic perturbation to the mean flow, significant amplification of unstable modes results, leading to enhanced mixing in laminar flow. Good agreement was found between Computational Fluid Dynamics (CFD) and experimental results for the critical Re, for which instability sets-in, and its related Struohal number. In order to evaluate mixing efficiency, backward tracing particle was performed using the computed flow field. Mixing is estimated based on particle’s location in time and space. A parametric mixing study was performed and its results are presented and discussed. It is shown that mixing was significantly enhanced when the perturbation frequency was matched with the baseline’s most-unstable Struohal number, even for sub-critical Reynolds number.
Sponsorship	Fluids Engineering Division
Starting Page	237
Ending Page	242
Page Count	6
File Format	PDF
ISBN	0791847098
DOI	10.1115/IMECE2004-61648
Volume Number	Fluids Engineering
Conference Proceedings	ASME 2004 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2004-11-13
Publisher Place	Anaheim, California, USA
Access Restriction	Subscribed
Subject Keyword	Confined twin-jet Micro-mixers Hydrodynamic instability Particles back-tracing Geometry Computational fluid dynamics Hydrodynamic stability Laminar flow Particulate matter Reynolds number Bifurcation Flow (dynamics)
Content Type	Text
Resource Type	Article

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