Publication de 12 numéros par an
ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684
Indexed in
ON THE PRIMARY ATOMIZATION OF NON-NEWTONIAN IMPINGING JETS: VOLUME II LINEAR STABILITY THEORY
RÉSUMÉ
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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Rodrigues Neil S., Kulkarni Varun, Gao Jian, Chen Jun, Sojka Paul E., Spray formation and atomization characteristics of non-Newtonian impinging jets at high Carreau numbers, International Journal of Multiphase Flow, 106, 2018. Crossref