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Atomization and Sprays
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ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2014008726
pages 525-554

ON THE PRIMARY ATOMIZATION OF NON-NEWTONIAN IMPINGING JETS: VOLUME II LINEAR STABILITY THEORY

Jennifer Mallory
Western New England University; Maurice J. Zucrow Laboratories, Purdue University, West Lafayette, Indiana 47907, USA
Paul E. Sojka
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, 47907-2014, USA

SINOPSIS

The effect of liquid rheology on the flow field resulting from non-Newtonian impinging jets was investigated experimentally and analytically. Prior to jet impingement, the rheological properties of Kappa carrageenan, Agar, and several carboxymethylcellulose water-based mixtures were obtained using a rotational rheometer. All liquids exhibited pseudoplastic behavior. Experimental impinging jet data were acquired using a unique facility. Sheet instability wavelengths, sheet breakup lengths, ligament diameters, and drop diameters were measured from high-speed video images. These results were compared to predictions from a linear stability theory, which accounted for the Bird−Carreau pseudoplastic rheology, and to semiempirical theories of sheet breakup length taken from the literature. Analytical results accurately predicted experiment data for all investigated formulations, with the exception of 1 wt.% Agar. This deviation is attributed to Agar's slightly different chemical molecular structure and its resultant effect on atomization. Overall, the linear stability theory developed herein shows an improvement over previous linear stability theories, which consistently overpredicted results.


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