Entity

Time filter

Source Type

Troy, OH, United States

Fasano J.B.,Mixer Engineering Co. | Myers K.J.,University of Dayton | Janz E.E.,Chemineer Inc.
Canadian Journal of Chemical Engineering | Year: 2011

The effects of impeller blade width and blade number on the gas dispersion behaviour of disc impellers with semicircular blades have been characterised. Increasing blade width or number increases the ungassed turbulent power number and reduces the drop in power draw upon gassing. While speed and power required for gas dispersion decrease with increasing blade width and number, the dispersion torque is relatively independent of these impeller geometric characteristics. A three-blade impeller exhibits the worst gas dispersion characteristics, while a four-blade impeller with non-uniform blade spacing outperforms a four-blade impeller with uniform blade spacing. © 2011 Canadian Society for Chemical Engineering. Source


Fasano J.B.,Mixer Engineering Co.
Chemical Engineering Progress | Year: 2015

The optimal type of impeller for a particular application depends on whether the flow regime is turbulent, transitional, or laminar. In immiscible liquid-liquid applications, the best impeller class depends on the desired droplet size. Many applications require the suspension of solids to a specific level of uniformity, ranging from off-bottom to 100% uniformity. In applications with viscous fluids, this blending requirement will determine the most appropriate impeller. The blending requirement may also dominate impeller selection in applications that require the creation of a slurry when the level of agitation or the mean velocity required for blending is more than six times than that required for suspending solids. High-efficiency radial-flow impellers can handle large gas flowrates in turbulent flow with aeration numbers as high as 2.5. Source


Myers K.J.,University of Dayton | Jones J.K.,University of Dayton | Janz E.E.,Chemineer Inc. | Fasano J.B.,Mixer Engineering Co.
Canadian Journal of Chemical Engineering | Year: 2014

With the impeller placed low in the tank (C/T=1/3), turbulent blend times produced by radial-flow and down-pumping axial-flow impellers generally increase slowly with increasing liquid level in shorter batches (Z/T<1), but increase dramatically in taller batches (Z/T>1). The turbulent blend times produced by up-pumping axial-flow impellers increase slowly with increasing liquid level across the entire spectrum of liquid levels that were studied (up to Z/T=1.75). This can lead to down-pumping blend times that are twice as long as those with up-pumping operation. These differences can be explained by differences in the velocity field in the agitated vessel. Further, the down-pumping mode can produce blend times in tall tanks that are comparable to those of the up-pumping mode if the down-pumping impeller is placed high in the batch such that its discharge flow is directed into the bulk of the liquid. © 2013 Canadian Society for Chemical Engineering. Source


Myers K.J.,University of Dayton | Janz E.E.,Chemineer Inc. | Fasano J.B.,Mixer Engineering Co.
Canadian Journal of Chemical Engineering | Year: 2013

Data taken with six solids at numerous Zwietering loadings ranging from near zero to 67 have been used to determine the just-suspended speed Zwietering loading exponent (Njs∝Xn where n is the Zwietering solids loading exponent). When only the loadings range similar to that studied by Zwietering [Zwietering, Chem. Eng. Sci. 1958, 8, 244] is considered (0 Source


Bao T.,University of Dayton | Myers K.J.,University of Dayton | Janz E.E.,Chemineer Inc. | Fasano J.B.,Mixer Engineering Co.
Canadian Journal of Chemical Engineering | Year: 2013

For binary solid mixtures, the mixture just-suspended speed is predicted with reasonable accuracy from the sum of powers to suspend the solids individually. Exceptions to this behaviour occur for mixtures of low-density solids and for mixtures involving a small, high-density solid. For these systems, summing the powers required to individually suspend the solids over-predicts the mixture just-suspended speed. Limited testing of ternary solid mixtures indicates that summing the powers required to individually suspend the solids also predicts the just-suspended speed in these more complex systems. © 2013. Source

Discover hidden collaborations