Author: W. D. GarrettPublisher:
ISBN:
Category :
Languages : en
Pages : 14
Book Description
The Damping of Capillary Waves at the Air/water Interface by Naturally Occuring Surface-active Material
Author: W. D. GarrettThe Damping of Capillary Waves at the Air/ Water Interface by Naturally Occurring Surface-active Material
Author: W. D. GarrettPublisher:
ISBN:
Category :
Languages : en
Pages : 15
Book Description
The damping of capillary waves was measured on fresh sea water, sampled from the Bay of Panama under various oceanographic conditions. The collected water contained varying quantities of surface-active organic materials capable of adsorbing at the air/water interface and altering the surface properties. Agitation, thermal currents, and bubbling were studied as mechanisms for the transport of film-forming material from the bulk water to the surface. Large increases in the rate of film accumulation occurred when these mechanisms were applied. Simultaneous measurements of damping coefficient and film pressure indicated that wave damping commenced at a film pressure of a few tenths of 1 dyne/cm and increased to a maximum value of from 0.39 to 0.44/cm in the neighborhood of 1 dyne/cm. As the film pressure was increased further by compression of the surface film, the damping coefficient decreased to a value of about 0.26/cm and became constant when the film pressure had reached 2 dynes/cm. It was postulated that a portion of the wave energy loss was due to a viscous drag of the associated chains of water molecules which were bonded to the molecules of the adsorbed surface film. The drag occurs when the molecules are forced into movement as a result of the alternating compression and expansions of the surface caused by the passing progressive waves. (Author).
Report of NRL Progress
Author: Naval Research Laboratory (U.S.)Publisher:
ISBN:
Category : Naval research
Languages : en
Pages : 380
Book Description
NRL Report
Author: Technical Abstract Bulletin
Author: Naval Engineers Journal
Author: Advances in Geophysics
Author: Publisher: Academic Press
ISBN: 0080568408
Category : Science
Languages : en
Pages : 461
Book Description
Advances in Geophysics
Suppression of Capillary Waves by Surface-Active Films
Author: David NelsonPublisher:
ISBN:
Category :
Languages : en
Pages : 50
Book Description
Minute amounts of ampiphillic molecules at an air-water interface can have striking effects on both the damping and generation of capillary waves. The theory of these effects within linearized hydrodynamics is reviewed. The conventional wisdom is that oil calms troubled waters by increasing the rate of capillary wave damping. Although surface-active films can increase the damping rate by factors of two to four, a potentially more important effect is the suppression of capillary wave generation by the wind. In particular, generation by the components of fluctuating Reynold's stresses in the atmosphere parallel to the surface can be reduced by an order of magnitude or more. The theory predicts a more modest suppression of the effect of Reynold's stresses normal to the surface. Keywords: Capillary waves, Hydrodynamics, Ampiphillic molecules.
Government-wide Index to Federal Research & Development Reports
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1576
Book Description
Monthly Catalog of United States Government Publications
Author: United States. Superintendent of DocumentsPublisher:
ISBN:
Category : Government publications
Languages : en
Pages : 758
Book Description