Results 241 to 250 of about 3,078,462 (291)

The Air Drag of Hulls

Aircraft Engineering and Aerospace Technology, 1937
THE design of a flying boat hull is a compromise between the usually conflicting requirements of good performance on the water and in flight. For example, from aerodynamic considerations the hull should be without discontinuities, while for low water resistance when planing, discontinuities are necessary in the form of steps and chines, the former to ...
L.P. Coombes, K.W. Clark
openaire   +1 more source

Bioinspired Air-Retaining Nanofur for Drag Reduction

ACS Applied Materials & Interfaces, 2015
Bioinspired nanofur, covered by a dense layer of randomly distributed high aspect ratio nano- and microhairs, possesses superhydrophobic and air-retaining properties. Nanofur is fabricated using a highly scalable hot pulling method in which softened polymer is elongated with a heated sandblasted plate.
Kavalenka, M. N., Vüllers, F., Lischker, S., Zeiger, C., Hopf, A., Röhrig, M., Rapp, B. E., Worgull, M., Hölscher, H.   +8 more
openaire   +3 more sources

Melt spinning of fibers: Effect of air drag

Journal of Applied Polymer Science, 1979
Experimental measurements of the magnitude of air drag on the filament and the air velocity profile around the filament in the spinning and drawing down of a fiber filament in the surrounding of stagnant air are reported. The results are examined in comparison with the existing theoretical correlations which have been used in the studies of the ...
D. C. Prevorsek, Y. D. Kwon
openaire   +1 more source

On the scaling of air layer drag reduction

Journal of Fluid Mechanics, 2013
AbstractAir-induced drag reduction was investigated on a 12.9 m long flat plate test model at a free stream speed of$6. 3~\mathrm{m} ~{\mathrm{s} }^{- 1} $. Measurements of the local skin friction, phase velocity profiles (liquid and gas) and void fraction profiles were acquired at downstream distances to 11.5 m, which yielded downstream-distance-based
Elbing, Brian R., Mäkiharju, Simo, Wiggins, Andrew, Perlin, Marc, Dowling, David R., Ceccio, Steven L.   +5 more
openaire   +2 more sources

A classroom demonstration on air drag forces

European Journal of Physics, 1991
The vertical fall of a gas balloon is analysed both theoretically and experimentally. The experiment can be used as a first-year classroom demonstration, and shows clearly that for the velocity range considered, Newton's draw law should be used instead of the popular Stokes' law.
J Bisquert, P Ramirez, A J Barbero, S Mafe   +3 more
openaire   +1 more source

The problem of variable air drag perturbation

Chinese Astronomy and Astrophysics, 1996
Abstract This paper discusses the problem of variable air drag perturbation of man-made space vehicles. An analytical solution of the perturbation is given and a comparison made with usual drag perturbation. Two main conclusions are found: 1. The variable drag perturbation retains the basic characteristics of usual drag perturbation. 2.
Zhao Chang-yin, Wu Lian-da
openaire   +1 more source

The Axial Air-Drag of Monofilaments

Journal of the Textile Institute Transactions, 1962
(1962). The Axial Air-Drag of Monofilaments. Journal of the Textile Institute Transactions: Vol. 53, No. 12, pp. T576-T576.
openaire   +1 more source

Gravity Turn Descent with Quadratic Air Drag

Journal of Guidance, Control, and Dynamics, 1997
Summary: It has been demonstrated that the conventional solution for a gravity turn maneuver in vacuum may be extended to include descent to the surface of a body with an atmosphere. With the assumption of quadratic air drag, the resulting equations of motion are shown to be a form of Bernoulli's equation, which has a closed analytical solution.
openaire   +2 more sources

Air drag on a progressively accelerated disc

Journal of Physics D: Applied Physics, 1988
The motion through air of a disc acted upon by an external constant force and by the air drag force is investigated. Experimental data are well fitted by assuming that, at high Reynolds numbers (Re> approximately 103), the disc encounters, besides the usual added mass term and the quadratic damping term -Bv2, an additional drag proportional to the ...
L Basano, P Ottonello
openaire   +1 more source

Air drag effect on the motion of an artificial Earth satellite

Earth, Moon, and Planets, 1996
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Almleaky, Y. M., Helali, Y. E., Basurah, H. M., Malawi, A. A., Goharji, A. A., Esmaial, M. N.   +5 more
openaire   +1 more source