Comparisons Of Turbulent Boundary Layer Measurements At Mach Number 19 5 With Theory And An Assessment Of Probe Errors
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Comparisons of Turbulent-boundary-layer Measurements at Mach Number 19.5 with Theory and an Assessment of Probe Errors by Ivan E. Beckwith,Frank L. Clark,William D. Harvey Pdf
Measurements of total temperature and pitot pressure across boundary layer of test section wall of axisymmetric contoured nozzle at hypersonic speed in nitrogen.
Experimental Laminar, Transitional, and Turbulent Boundary-layer Profiles on a Wedge at Local Mach Number 6.5 and Comparisons with Theory by Michael C. Fischer Pdf
Wind tunnel investigation of laminar, transitional, and turbulent boundary layer profiles on wedge at hypersonic speed to confirm theoretical analysis.
Gas Flows in Microsystems by Lucien Baldas,Stéphane Colin Pdf
The last two decades have witnessed a rapid development of microelectromechanical systems (MEMS) involving gas microflows in various technical fields. Gas microflows can, for example, be observed in microheat exchangers designed for chemical applications or for cooling of electronic components, in fluidic microactuators developed for active flow control purposes, in micronozzles used for the micropropulsion of nano and picosats, in microgas chromatographs, analyzers or separators, in vacuum generators and in Knudsen micropumps, as well as in some organs-on-a-chip, such as artificial lungs. These flows are rarefied due to the small MEMS dimensions, and the rarefaction can be increased by low-pressure conditions. The flows relate to the slip flow, transition or free molecular regimes and can involve monatomic or polyatomic gases and gas mixtures. Hydrodynamics and heat and mass transfer are strongly impacted by rarefaction effects, and temperature-driven microflows offer new opportunities for designing original MEMS for gas pumping or separation. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel theoretical and numerical models or data, as well as on new experimental results and technics, for improving knowledge on heat and mass transfer in gas microflows. Papers dealing with the development of original gas MEMS are also welcome.
Author : United States. Superintendent of Documents Publisher : Unknown Page : 1408 pages File Size : 43,8 Mb Release : 1976 Category : United States ISBN : STANFORD:36105021034173
Experimental and Numerical Investigation of Boundary-layer Development and Transition on the Walls of a Mach 5 Nozzle by William D. Harvey,Aubrey M. Cary,Julius E. Harris Pdf
Experimental Study of Nozzle Wall Boundary Layers at Mach Numbers 20 to 47 by Joseph H. Kemp,F. Kevin Owen Pdf
The nozzle wall boundary layer of an M-50 helium tunnel was investigated with pitot pressure, total temperature, skin friction, and wall heat transfer measurements at five stations and hot wire measurements at two stations. The results indicated that the boundary layer was turbulent with a thick viscous sublayer. Pressure gradients were observed across the boundary layer; the effect of these gradients on the equations of motion are discussed. The direct skin friction measurements were higher than expected from empirical predictions; the Reynolds analogy factors however were lower than expected. Hot wire measurements indicated mass flow fluctuations as large as 80 percent of the local mean mass flow at the edge of the viscous sublayer with a maximum value relative to the edge mass flow of about 15 percent at gamma about equal to 0.8.
