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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 16 Apr 2024 01:36:39 +0000Techniques for Metric Photography
https://resolver.caltech.edu/CaltechAUTHORS:20140729-110919819
Authors: {'items': [{'id': 'Waugh-J-G', 'name': {'family': 'Waugh', 'given': 'J. G.'}}, {'id': 'Ellis-A-T', 'name': {'family': 'Ellis', 'given': 'A. T.'}}, {'id': 'Mellsen-S-B', 'name': {'family': 'Mellsen', 'given': 'S. B.'}}]}
Year: 1966
DOI: 10.5594/J15361
Three techniques for metric photography are described. In the first, missile position-time data are obtained from measurement of photographs of the virtual image
produced in a precision-ground sphere by a timed stroboscopic point-source lamp. In the second, a rotating circular film disc is covered with sector-shaped exposures
using a timed stroboscopic lamp. In the third, the previously described techniques are combined to obtain data simultaneously.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/am01s-xcq69Real Fluid Effects on an Accelerated Sphere Before Boundary-Layer Separation
https://resolver.caltech.edu/CaltechAUTHORS:20140903-155819036
Authors: {'items': [{'id': 'Mellsen-S-B', 'name': {'family': 'Mellsen', 'given': 'S. B.'}}, {'id': 'Waugh-J-G', 'name': {'family': 'Waugh', 'given': 'J. G.'}}, {'id': 'Ellis-A-T', 'name': {'family': 'Ellis', 'given': 'A. T.'}}]}
Year: 2014
Studies were made on the apparent increase in mass on acceleration (added mass) of a sphere accelerated from rest and before boundary-layer separation, in cylinders
of various diameters filled with water or oil. From a comparison of theoretical and experimentally obtained added masses, the following conclusions were drawn: In the
absence of wall effects on the boundary layer, the wall shear stress over elements of the sphere can be approximated by the solution for the flat plate moving parallel to itself and the potential flow over the elements outside the boundary layer. The impulse on the elements is obtained by integration with respect to time, and the wall
drag and drag impulse on the sphere by integration over the sphere surface. Good theoretical and experimental agreement obtains under the assumption that a mass of fluid, estimated from the wall drag impulse, is carried in the boundary layer and may be university distributed over the sphere.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/zbk2s-d8t60On the Added Mass of a Sphere in a Circular Cylinder Considering Real Fluid Effects
https://resolver.caltech.edu/CaltechAUTHORS:20150603-152348259
Authors: {'items': [{'id': 'Mellsen-S-B', 'name': {'family': 'Mellsen', 'given': 'S. B.'}}, {'id': 'Ellis-A-T', 'name': {'family': 'Ellis', 'given': 'A. T.'}}, {'id': 'Waugh-J-G', 'name': {'family': 'Waugh', 'given': 'J. G.'}}]}
Year: 2015
An experimental method combined with boundary layer theory
is given for evaluating the added mass of a sphere moving along the axis of a circular cylinder filled with water or oil. The real fluid effects are separated from ideal fluid effects.
The experimental method consists essentially of a magnetic
steel sphere propelled from rest by an electromagnetic coil in which the current is accurately controlled so that it only supplies force for a short time interval which is within the laminar flow regime of the fluid. The motion of the sphere as a function of time is recorded on single frame photographs using a short-arc multiple flash lamp with
accurately controlled time intervals between flashes.
A concept of the effect of boundary layer displacement on the fluid flow around a sphere is introduced to evaluate the real fluid effects on the added mass. Surprisingly accurate agreement between experiment and theory is achieved.https://authors.library.caltech.eduhttps://authors.library.caltech.edu/records/yr9e8-qx875