Capillary breakup extensional electrorheometry (CaBEER)

2020 ◽  
Vol 64 (1) ◽  
pp. 43-54 ◽  
Author(s):  
Samir H. Sadek ◽  
Hossein H. Najafabadi ◽  
Francisco J. Galindo-Rosales
Keyword(s):  
Capillary Breakup

Modal Analysis of Breakup Mechanisms for a Liquid Jet in Crossflow

2021 ◽  
pp. 1-36
Author(s):  
Sheikh Salauddin ◽  
Wilmer Flores ◽  
Michelle Otero ◽  
Bernhard Stiehl ◽  
Kareem Ahmed
Keyword(s):  
Coherent Structures ◽  
Liquid Fuel ◽  
Hydrodynamic Instability ◽  
Aviation Industry ◽  
Dynamic Mode ◽  
Capillary Breakup ◽  
Breakup Mechanism ◽  
Jet In Crossflow ◽  
Fuel Jet ◽  
Primary Breakup

Abstract Liquid fuel jet in Crossflow (LJIC) is a vital atomization technique significant to the aviation industry. The hydrodynamic instability mechanisms that drive a primary breakup of a transverse jet are investigated using modal and traveling wavelength analysis. This study highlights the primary breakup mechanisms for aviation fuel Jet-A, utilizing a method that could be applied to any liquid fuel. Mathematical decomposition techniques known as POD (Proper Orthogonal Decomposition) and Robust MrDMD (Multi-Resolution Dynamic Mode Decomposition) are used together to identify dominant instability flow dynamics associated with the primary breakup mechanism. Implementation of the Robust MrDMD method deconstructs the nonlinear dynamical systems into multiresolution time-scaled components to capture the intermittent coherent structures. The Robust MrDMD, in conjunction with the POD method, is applied to data points taken across the entire spray breakup regimes: enhanced capillary breakup, bag breakup, multimode breakup, and shear breakup. The dominant frequencies of breakup mechanisms are extracted and identified. These coherent structures are classified with an associated time scale and Strouhal number. Three primary breakup mechanisms, namely ligament shedding, bag breakup, and shear breakup, were identified and associated with the four breakup regimes outlined above. Further investigation portrays these breakup mechanisms to occur in conjunction with each other in each breakup regime, excluding the low Weber number Enhanced Capillary Breakup regime. Spectral analysis of the Robust MrDMD modes' entire temporal window reveals that while multiple breakup mechanisms are convolved, there is a dominant breakup route for each breakup regime. An associated particular traveling wavelength analysis further investigates each breakup mechanism. Lastly, this study explores the effects of an increased momentum flux ratio on each breakup mechanism associated with a breakup regime.

scholarly journals The effect of step-stretch parameters on capillary breakup extensional rheology (CaBER) measurements

2009 ◽  
Vol 48 (6) ◽  
pp. 625-639 ◽  
Author(s):  
Erik Miller ◽  
Christian Clasen ◽  
Jonathan P. Rothstein
Keyword(s):  
Extensional Rheology ◽  
Capillary Breakup

Differential analysis of capillary breakup rheometry for Newtonian liquids

2016 ◽  
Vol 804 ◽  
pp. 116-129
Author(s):  
Louise L. McCarroll ◽  
Michael J. Solomon ◽  
William W. Schultz
Keyword(s):  
Axial Force ◽  
Integral Method ◽  
Viscosity Ratio ◽  
Differential Method ◽  
Differential Analysis ◽  
One Dimensional ◽  
Capillary Breakup ◽  
Silicone Oils ◽  
Newtonian Liquids

We present a Newtonian, one-dimensional, differential analysis for capillary breakup rheometry (CBR) to determine the surface tension to viscosity ratio $\unicode[STIX]{x1D6FC}$. Our local differential analysis does not require specific assumptions for the axial force to preclude its measurement. Our analysis indicates that measuring gradients in filament curvature is necessary to accurately determine $\unicode[STIX]{x1D6FC}$ when axial force is not measured. CBR experiments were performed on five silicone oils ($0.35~\text{Pa}~\text{s}<\unicode[STIX]{x1D707}<10~\text{ Pa}~\text{s}$), three sample volumes, and three strains to evaluate the operating range of the differential analysis and compare its performance to that of a standard integral method from literature. We investigate the role of filament asymmetry, caused mainly by gravity, on the performance of the differential method for the range of conditions studied. Experimental and analytical details for resolving gradients of curvature are also given.

Thermocapillary stabilization of the capillary breakup of an annular film of liquid

1991 ◽  
Vol 229 (-1) ◽  
pp. 205 ◽  
Author(s):  
Henk A. Dijkstra ◽  
Paul H. Steen
Keyword(s):  
Capillary Breakup ◽  
Annular Film

Satellite and subsatellite formation in capillary breakup

1992 ◽  
Vol 243 (-1) ◽  
pp. 297 ◽  
Author(s):  
M. Tjahjadi ◽  
H. A. Stone ◽  
J. M. Ottino
Keyword(s):  
Capillary Breakup

Extensional flow behavior of aqueous guar gum derivative solutions by capillary breakup elongational rheometry (CaBER)

2016 ◽  
Vol 136 ◽  
pp. 834-840 ◽  
Author(s):  
Daniel Szopinski ◽  
Ulrich A. Handge ◽  
Werner-Michael Kulicke ◽  
Volker Abetz ◽  
Gerrit A. Luinstra
Keyword(s):  
Guar Gum ◽  
Flow Behavior ◽  
Extensional Flow ◽  
Capillary Breakup ◽  
Elongational Rheometry

Capillary breakup extensional properties of whole human saliva

2015 ◽  
Author(s):  
Mihaela Turcanu ◽  
Lucia Frau Tascon ◽  
Corneliu Balan ◽  
Crispulo Gallegos
Keyword(s):  
Human Saliva ◽  
Capillary Breakup

Determination of axial forces during the capillary breakup of liquid filaments – the tilted CaBER method

2012 ◽  
Vol 51 (10) ◽  
pp. 909-923 ◽  
Author(s):  
Dirk Sachsenheimer ◽  
Bernhard Hochstein ◽  
Hans Buggisch ◽  
Norbert Willenbacher
Keyword(s):  
Capillary Breakup ◽  
Axial Forces

scholarly journals Reduced model for capillary breakup with thermal gradients: Predictions and computational validation

2021 ◽  
Vol 33 (12) ◽  
pp. 122003
Author(s):  
I. Shukla ◽  
F. Wang ◽  
S. Mowlavi ◽  
A. Guyomard ◽  
X. Liang ◽  
...  
Keyword(s):  
Reduced Model ◽  
Thermal Gradients ◽  
Capillary Breakup ◽  
Computational Validation

Dripping-onto-substrate capillary breakup extensional rheometry of low-viscosity printing inks

2019 ◽  
Vol 266 ◽  
pp. 160-170 ◽  
Author(s):  
Maxime Rosello ◽  
Samrat Sur ◽  
Bruno Barbet ◽  
Jonathan P. Rothstein
Keyword(s):  
Capillary Breakup ◽  
Low Viscosity ◽  
Extensional Rheometry ◽  
Printing Inks
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