Direct Measurement of Skin Friction in Complex Fluid Flows

1997 ◽  
Vol 50 (11S) ◽  
pp. S198-S203 ◽  
Author(s):  
Joseph A. Schetz
Keyword(s):  
Skin Friction ◽  
Direct Measurement ◽  
High Speed ◽  
Fluid Flows ◽  
Measurement Results ◽  
Hypersonic Speeds ◽  
Complex Fluid ◽  
3D Flows ◽  
2D And 3D ◽  
Very High

This paper describes methods for the direct measurement of skin friction in fluid flows under a very wide variety of conditions. The challenges involved in different flow situations are highlighted, and representative instrument designs and measurement results are presented. The test conditions considered span the range from incompressible to hypersonic speeds; ambient to very high temperature including combusting flows; smooth, rough, and porous surfaces with and without injection and test times from 10-6 to essentially continuous runs. Both 2D and 3D flows are discussed. Accuracies of +/- 3-5% are presently attainable in the simplest cases, while +/- 10-15% is more typical for complex, 3D, high-speed flows at high temperatures. The final topic discussed is simultaneous measurements of skin friction and heat flux with the possible further additions of surface pressure and temperature.

Suspension Mixing and Segregation in 1D, 2D, and 3D Flows

2007 ◽  
Author(s):  
James F. Gilchrist ◽  
Changbao Gao
Keyword(s):  
High Speed ◽  
Laser Scanning ◽  
Laser Scanning Microscopy ◽  
Chaotic Advection ◽  
Confocal Laser ◽  
Particle Velocities ◽  
Complicated Geometries ◽  
3D Flows ◽  
2D And 3D ◽  
Suspension Structure

Particles in concentrated flowing suspension in pressure-driven flows tend to migrate away from the walls toward the center of the channel. Demixing due to shear-induced migration inhibits mixing and near wall transport. We investigate the competition between mixing and segregation in flows with complicated geometries that generate 3D chaotic advection, resulting in nontrivial concentration patterns. Using high-speed confocal laser scanning microscopy, we directly image the microspheres to measure the interplay between chaotic advection and the 3D spatial concentration profile, local particle velocities, and suspension structure.

Structural changes in silicon-on-insulator material during post-implantation annealing

1986 ◽  
Vol 44 ◽  
pp. 736-737
Author(s):  
C. O. Jung ◽  
S. J. Krause ◽  
S.R. Wilson
Keyword(s):  
Integrated Circuits ◽  
Oxide Layer ◽  
High Speed ◽  
Structural Changes ◽  
Device Fabrication ◽  
Silicon On Insulator ◽  
High Quality ◽  
Radiation Hardened ◽  
Post Implantation ◽  
Very High

Silicon-on-insulator (SOI) structures have excellent potential for future use in radiation hardened and high speed integrated circuits. For device fabrication in SOI material a high quality superficial Si layer above a buried oxide layer is required. Recently, Celler et al. reported that post-implantation annealing of oxygen implanted SOI at very high temperatures would eliminate virtually all defects and precipiates in the superficial Si layer. In this work we are reporting on the effect of three different post implantation annealing cycles on the structure of oxygen implanted SOI samples which were implanted under the same conditions.

YSS HAP72

Alloy Digest ◽  
2019 ◽  
Vol 68 (10) ◽  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Powder Metallurgy ◽  
Tool Steel ◽  
High Speed ◽  
High Wear Resistance ◽  
Bend Strength ◽  
Temperature Performance ◽  
Very High

Abstract YSS HAP72 is a powder metallurgy high-speed tool steel with a very high wear resistance. This datasheet provides information on composition, hardness, and bend strength. It also includes information on high temperature performance. Filing Code: TS-779. Producer or source: Hitachi Metals America Ltd.

Very High-Speed Report File System

1992 ◽  
Author(s):  
Timothy J. Salo ◽  
John D. Cavanaugh ◽  
Michael K. Spengler
Keyword(s):  
High Speed ◽  
File System ◽  
Very High

Very high speed continuous sampling using matched delays

1994 ◽  
Vol 30 (6) ◽  
pp. 463-465 ◽  
Author(s):  
S.M. Clements ◽  
R.K. Cavin III ◽  
J. Kang ◽  
W. Liu
Keyword(s):  
High Speed ◽  
Continuous Sampling ◽  
Very High
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