NDLI: Off-axis drag of dendrite fragments at low reynolds number

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Off-axis drag of dendrite fragments at low reynolds number

Content Provider	NASA Technical Reports Server (NTRS)
Author	Weidman, P. D.
Copyright Year	1994
Description	The aim of the present investigation is to characterize the motion of dendrite fragments falling under the influence of gravity in a uniform liquid medium at low Reynolds number. In an earlier study, Zakhem, Weidman and de Groh (1992) reported on the settling speed of model equiaxed dendrite grains released along their axis of symmetry. In this follow-up study uniaxial model dendrite grains were released off-axis to observe and document their motion at different orientations. It was hypothesized that the dendrite models might rotate when released off-axis in which case an attempt would be made to document the ensuing unsteady motion. This latter event turned out to be in fact true: at the small but finite Reynolds numbers that existed, each uniaxial dendrite slowly rotated towards its equilibrium orientation while failing under the influence of gravity. In addition to completing the original goal, we have made use of a beads-on-a shell Stokes flow code to numerically determine the drag coefficient for capsules, i.e.. uniaxial dendrites without arms. The drag on horizontally and vertically falling capsules are reported and compared with measurements.
File Size	685507
Page Count	23
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19980169280
Archival Resource Key	ark:/13960/t3nw4d04w
Language	English
Publisher Date	1994-01-01
Access Restriction	Open
Subject Keyword	Aerodynamics Low Reynolds Number Aerodynamic Drag Gravitational Effects Dendritic Crystals Neurons Particle Motion Reynolds Number Fragments Aerodynamic Coefficients Symmetry Stokes Flow Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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