Drag on object moving through foam

dc.contributor.advisor B. R. Munson
dc.contributor.author Chung, Chinwha
dc.contributor.department Aerospace Engineering
dc.date 2018-08-15T06:45:26.000
dc.date.accessioned 2020-07-02T06:14:31Z
dc.date.available 2020-07-02T06:14:31Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 1991
dc.date.issued 1991
dc.description.abstract <p>Foams consist of small gas bubbles separated by thin liquid films. Although many complex models have been developed to describe the rheological properties of foam, very little information is available concerning the flow charateristics of foam flowing past an object. The purpose of this research was to investigate foam flow properties by performing simple experiments to determine the drag charateristics of simple-shaped bodies moving through foam;A rotating tank apparatus was built and used as the equivalent of a wind tunnel in aerodynamic testing. Foam with consistent properties was produced and models of various shapes were suspended in the moving foam. The drag on the model moving through the foam was obtained by using a simple strain gauge force balance. The foams were made from liquid soap, water, and air. By varying the percent of these quantities, foams with various properties were produced;The drag was measured as a function of velocity, foam properties, and body type (spheres, disks, ellipsoids, and flat plates). Various surface roughnesses were tested to determine the dependence of drag on surface texture. This is especially important for foam flows because of their "slip" condition at solid surfaces;The experimental data obtained indicate that a foam flow has a Bingham plastic charateristic with a yield stress. The drag was a consistent function of the foam quality and soap-water solution's viscosity. For the case of rough surface specimens, the drag increment differs from that of Newtonian laminar flow.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/9606/
dc.identifier.articleid 10605
dc.identifier.contextkey 6360737
dc.identifier.doi https://doi.org/10.31274/rtd-180813-9257
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/9606
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/82723
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/9606/r_9207240.pdf|||Sat Jan 15 02:35:37 UTC 2022
dc.subject.disciplines Mechanical Engineering
dc.subject.keywords Aerospace engineering and engineering mechanics
dc.subject.keywords Engineering mechanics
dc.title Drag on object moving through foam
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 047b23ca-7bd7-4194-b084-c4181d33d95d
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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