(70dr) Drag Correlation for Motion of Drops on Fibers | AIChE

(70dr) Drag Correlation for Motion of Drops on Fibers

Authors 

Chase, G. G. - Presenter, The University of Akron
Dawar, S. - Presenter, university of akron
Li, H. - Presenter, university of akron


The objective of this paper is to correlate a drag coefficient to the Reynolds number for axial motion of barrel drops on fibers. The study of motion of drops is important to understand the drainage behavior of droplets. A significant amount of literature describes the mechanisms of droplet capture, coalescence, and drainage from filter media and models are developed at a scale that accounts for the liquid held in the filter through averaged parameters such as saturation. The study of drop motion on fibers is of scientific and economic interest for many possible applications like printing, coatings, drug delivery and release, and filters to remove or neutralize harmful chemicals or particulates from air streams. An experiment is designed to produce couette flow of air enabling the drop motion. Couette flow is produced with a rotating surface for air flow past the fiber and drops to produce linear laminar air velocity field. Drops are attached to the fibers by exposing the fibers to liquid aerosols. FLUENT software is used to numerically model the couette flow device to evaluate the air velocity profile to ensure the velocity field is in laminar flow. Different liquids and fiber materials are used having different wetting properties. The drops are observed to attach and move on the fibers as prolate spheroids (barrel drops) attached symmetrically around the fiber. The motion of the drops is a stochastic behavior. The vibrations are induced into the fiber and the drops to initiate the motion of these drops. The experimental drag coefficient verses Reynolds number data are compared with the 1-D cylindrical drop model and 3-D Fluent model for the cylindrical drops. The results show that the general trend is the same but the 1-D cylindrical model is not in a better agreement with the experimental results. It has also been observed that the vibrations do not have an effect on the drag coefficient results.

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