Name: Hydrodynamic Force on a Cylinder Oscillating at Low Frequency (en Inglés)
SKU: 59967226
Price: 25.03 USD
Availability: InStock
Author: Nasa Technical Reports Server (Ntrs)

portada Hydrodynamic Force on a Cylinder Oscillating at Low Frequency (en Inglés)

Hydrodynamic Force on a Cylinder Oscillating at Low Frequency (en Inglés)

Formato

Libro Físico

Autor

Nasa Technical Reports Server (Ntrs)

Editorial

Bibliogov

Idioma

Inglés

N° páginas

Encuadernación

Tapa Blanda

Dimensiones

24.6x18.9x0.3 cm

Peso

0.11 kg.

ISBN13

9781289234669

Categorías

Política y gobierno

Hydrodynamic Force on a Cylinder Oscillating at Low Frequency (en Inglés)

Nasa Technical Reports Server (Ntrs) (Autor) · Bibliogov · Tapa Blanda

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Reseña del libro "Hydrodynamic Force on a Cylinder Oscillating at Low Frequency (en Inglés)"

The hydrodynamic force on a cylinder oscillating transversely to its axis is a nonlinear function of the displacement amplitude x0. We report measurements and numerical calculations of the force at frequencies low enough that delta > R, where delta is the viscous penetration length and R is the cylinder radius. For small amplitudes, the numerically calculated Fourier transform of the force per unit length, F(sub small), agrees with Stokes' analytical calculation. For larger amplitudes, the force per unit length found by both calculation and measurement is F = F(sub small)C (x(sub 0)/delta, R/delta). The complex function C depends only weakly on R/delta, indicating that x0/delta is more appropriate as a scaling variable than the Keulegan-Carpenter number KC = pi*x(sub 0)/R. The measurements used a torsion oscillator driven at frequencies from 1 to 12 Hz while immersed in dense xenon. The oscillator comprised cylinders with an effective radius of R = 13.4 micron and oscillation amplitudes as large as x(sub 0)/delta = 4 (corresponding to KC as large as 71). The calculations used similar conditions except that the amplitudes were as large as x0/delta = 28.