Drag and drag partition on rough surfaces

1992 ◽  
Vol 60 (4) ◽  
pp. 375-395 ◽  
Author(s):  
M. R. Raupach
Keyword(s):  
Rough Surfaces ◽  
Drag Partition

A scheme for drag partition over rough surfaces

2005 ◽  
Vol 39 (38) ◽  
pp. 7351-7361 ◽  
Author(s):  
Y SHAO ◽  
Y YANG
Keyword(s):  
Rough Surfaces ◽  
Drag Partition

Drag Partition for Regularly-Arrayed Rough Surfaces

2003 ◽  
Vol 107 (2) ◽  
pp. 445-468 ◽  
Author(s):  
D. M. Crawley ◽  
W. G. Nickling
Keyword(s):  
Rough Surfaces ◽  
Drag Partition

scholarly journals A new parameterization of dust dry deposition over rough surfaces

2014 ◽  
Vol 14 (6) ◽  
pp. 8063-8094 ◽  
Author(s):  
J. Zhang ◽  
Y. Shao
Keyword(s):  
Dry Deposition ◽  
Rough Surfaces ◽  
Deposition Flux ◽  
Dust Deposition ◽  
Dust Collection ◽  
Surface Dust ◽  
Roughness Elements ◽  
Drag Partition ◽  
Dust Diffusion ◽  
Good Agreement

Abstract. The performances of existing dust dry deposition schemes are rather unsatisfactory for rough surfaces. In this study, we propose a new scheme to overcome some of the deficiencies. The scheme takes into consideration of the impacts of roughness elements on turbulent dust diffusion and surface dust collection. A relationship between the aerodynamics and surface collection process is established by using an analogy between deposition-flux partition and drag partition. The scheme is then tested against a wind-tunnel dataset for four different surfaces and a good agreement between the scheme predictions and the observations is found. The sensitivity of the scheme to the input parameters is tested. Important factors which affect dust deposition in different particle size ranges are identified. The scheme shows good capacity for modeling dust deposition over rough surfaces.

scholarly journals A new parameterization of particle dry deposition over rough surfaces

2014 ◽  
Vol 14 (22) ◽  
pp. 12429-12440 ◽  
Author(s):  
J. Zhang ◽  
Y. Shao
Keyword(s):  
Dry Deposition ◽  
Particle Deposition ◽  
Rough Surfaces ◽  
Deposition Velocity ◽  
Deposition Flux ◽  
Data Set ◽  
Roughness Elements ◽  
Drag Partition ◽  
Wind Tunnel Data ◽  
Surface Particle

Abstract. In existing particle dry deposition schemes, the effects of gravity and surface roughness elements on particle motion are often poorly represented. In this study, we propose a new scheme to overcome such deficiencies. Particle deposition velocity is a function of aerodynamic, surface-collection and gravitational resistances. In this study, the effect of gravitation settling is treated analytically. More importantly, the new scheme takes into consideration the impacts of roughness elements on turbulent particle diffusion and surface particle collection. A relationship between aerodynamic and surface-collection processes is established by using an analogy between drag partition and deposition-flux partition. The scheme is then tested against a wind-tunnel data set for four different surfaces and a good agreement between the scheme predictions and the observations is found. The sensitivity of the scheme to the input parameters is tested. Important factors which affect particle deposition in different particle size ranges are identified. The scheme shows good capacity for modeling particle deposition over rough surfaces.

Infrared spectra of carbon monoxide on platinum, iridium and copper ; comparison of flat and rough surfaces

1981 ◽  
Vol 78 ◽  
pp. 927-932 ◽  
Author(s):  
F.J.C.M. Toolenaar ◽  
G.J. van der Poort ◽  
F. Stoop ◽  
V. Ponec
Keyword(s):  
Carbon Monoxide ◽  
Infrared Spectra ◽  
Rough Surfaces

OPTICAL PROPERTIES OF THIN FILMS ON ROUGH SURFACES

1983 ◽  
Vol 44 (C10) ◽  
pp. C10-363-C10-366 ◽  
Author(s):  
J. Vlieger ◽  
M. M. Wind
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Rough Surfaces

A Laboratory Device to Measure the Interfacial Phenomena between Rubber and Rough Surfaces

1999 ◽  
Vol 27 (4) ◽  
pp. 206-226 ◽  
Author(s):  
L. Garro ◽  
G. Gurnari ◽  
G. Nicoletto ◽  
A. Serra
Keyword(s):  
Rough Surfaces ◽  
Computer Software ◽  
Interfacial Phenomena ◽  
New Device ◽  
The Road ◽  
Constant Torque ◽  
Rubber Compounds ◽  
Simple Geometry ◽  
Tangential Forces ◽  
On The Road

Abstract The interfacial phenomena between tread rubber compounds and rough surfaces are responsible for most of the behavior of a tire on the road. A new device was developed for the investigation of these phenomena in the laboratory. The device consists of a fully instrumented road wheel on which a simple geometry specimen is driven. The possibilities offered by this device are to perform tests at constant slip or at constant torque on both wet and dry surfaces, with complex cycles. The machine allows the measurement of slip, tangential forces, and temperature on the specimen, and computer software adds the possibility of applying Fourier analyses on force, road wheel speed, and specimen speed data. Other possibilities offered by the road wheel are to change the road surface, the load on the specimen, and the water rate. The description of a complete experiment is detailed in the paper showing the correlation of data with actual tire performances.

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