Drop formation in non-Newtonian jets at low Reynolds numbers

V Dravid, PB Loke, CM Corvalan, PE Sojka - 2008 - asmedigitalcollection.asme.org
V Dravid, PB Loke, CM Corvalan, PE Sojka
2008asmedigitalcollection.asme.org
The objective of this study was to develop an experimentally verified computational model
that accurately predicts evolution of shear-thinning liquid jets. A secondary objective was to
investigate the formation of satellite drops and to determine conditions under which their
diameter can be controlled. The model employs the Galerkin finite/element approach to
solve the complete two-dimensional set of axisymmetric governing equations and the
corresponding kinematic and dynamic boundary conditions at the free surface. The effect of …
The objective of this study was to develop an experimentally verified computational model that accurately predicts evolution of shear-thinning liquid jets. A secondary objective was to investigate the formation of satellite drops and to determine conditions under which their diameter can be controlled. The model employs the Galerkin finite/element approach to solve the complete two-dimensional set of axisymmetric governing equations and the corresponding kinematic and dynamic boundary conditions at the free surface. The effect of shear-thinning behavior on breakup was studied in detail for the case of an infinitely long non-Newtonian jet. It was found that shear-thinning behavior may be useful in controlling satellite drop sizes. (We observe that increasing the shear-thinning behavior at leads to an initial increase in the satellite drop size, followed by a subsequent decrease.) Comparison of model predictions with experimental data is presented for the case of a shear-thinning non-Newtonian jet. The experimental liquid was pumped through a capillary and drop shapes obtained using a high speed camera. The experimentally obtained shapes were compared to those predicted by the model and found to be in good agreement.
The American Society of Mechanical Engineers
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