Helium Flow Through an Orifice in the Presence of an AC Sound Field

1974 ◽  
pp. 414-418 ◽  
Author(s):  
D. Musinski ◽  
D. H. Douglass
Keyword(s):  
2000 ◽  
Author(s):  
Stephen E. Turner ◽  
Hongwei Sun ◽  
Mohammad Faghri ◽  
Otto J. Gregory

Abstract This paper presents an experimental investigation on nitrogen and helium flow through microchannels etched in silicon with hydraulic diameters between 10 and 40 microns, and Reynolds numbers ranging from 0.3 to 600. The objectives of this research are (1) to fabricate microchannels with uniform surface roughness and local pressure measurement; (2) to determine the friction factor within the locally fully developed region of the microchannel; and (3) to evaluate the effect of surface roughness on momentum transfer by comparison with smooth microchannels. The friction factor results are presented as the product of friction factor and Reynolds number plotted against Reynolds number. The following conclusions have been reached in the present investigation: (1) microchannels with uniform corrugated surfaces can be fabricated using standard photolithographic processes; and (2) surface features with low aspect ratios of height to width have little effect on the friction factor for laminar flow in microchannels.


1974 ◽  
Vol 9 (2) ◽  
pp. 885-892 ◽  
Author(s):  
J. P. Hulin ◽  
D. D'Humieres ◽  
B. Perrin ◽  
A. Libchaber

1999 ◽  
Author(s):  
Stephen E. Turner ◽  
Hongwei Sun ◽  
Mohammad Faghri ◽  
Otto J. Gregory

Abstract This paper presents an experimental investigation on nitrogen and helium flow in microchannels etched in silicon with hydraulic diameters of 9.7, 19.6, and 46.6 μm, and Reynolds numbers ranging from 0. 2 to 1000. The objectives of this research are (1) to measure the pressure distribution along the length of a microchannel; and (2) to determine the friction factor within the fully developed region of the microchannel. The pressure distribution is presented as absolute local pressure plotted against the distance from the microchannel inlet. The friction factor results are presented as the product of friction factor and Reynolds number plotted against Reynolds number with the outlet Knudsen number, Kn, as a curve parameter. The following conclusions have been reached in the present investigation: (1) Pressure losses at the microchannel entrance can be significant; (2) the product, f*Re, when measured sufficiently far away from the entrance and exit is a constant in the laminar flow region; and (3) the friction factor decreases as the Knudsen number increases.


Cryogenics ◽  
1996 ◽  
Vol 36 (9) ◽  
pp. 667-673 ◽  
Author(s):  
H. Nakai ◽  
N. Kimura ◽  
M. Murakami ◽  
T. Haruyama ◽  
A. Yamamoto

1967 ◽  
Vol 19 (15) ◽  
pp. 822-824 ◽  
Author(s):  
W. J. Trela ◽  
W. M. Fairbank

Author(s):  
Hirotaka Nakai ◽  
Nobuhiro Kimura ◽  
Masahide Murakami ◽  
Tomiyoshi Haruyama ◽  
Akira Yamamoto

2016 ◽  
Vol 41 (1) ◽  
pp. 124
Author(s):  
Reena Sayani ◽  
Samiran Shanti Mukherjee ◽  
Ranjana Gangradey

Author(s):  
Mahyar Madadi ◽  
Marjan Mehrabi

We use the Stochastic Rotation Dynamics (SRD) to simulate the fluid flow in 2D Carbon Nanotubes. The SRD algorithm is able to simulate flow in different length scale of the fluids. First of all, we use SRD algorithm to simulate the macroscopic Helium flow as a simple interacting system. Using Green-Kubo formula, viscosity of the system as a macroscopic quantity has been calculated. Then, we apply our algorithm to simulate the Helium flow through the Carbon Nanotube in two dimensions. Finally, we find the effect of interaction of Carbon Nanotube with viscosity as a function of temperature. Also, our simulation shows the viscoelastic effects in 2D flow.


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