Approximations for the Quality Factor of the Interlayer-flow Model, its Minimum Value, and the Characteristic Frequency

2011 ◽  
Author(s):  
B. Quintal ◽  
S. M. Schmalholz ◽  
Y. Y. Podladchikov
Keyword(s):  
Quality Factor ◽  
Characteristic Frequency ◽  
Flow Model ◽  
Minimum Value

Air Damping Evaluation for Laterally Driven Electrostatic Repulsive-Force Microactuators

2000 ◽  
Author(s):  
Ki Bang Lee ◽  
Young-Ho Cho
Keyword(s):  
Experimental Study ◽  
Quality Factor ◽  
Flow Model ◽  
Characteristic Length ◽  
Ambient Air ◽  
Repulsive Force ◽  
Creeping Flow ◽  
Damping Force ◽  
Air Damping ◽  
Simulation Results

Abstract This paper presents theoretical and experimental study on the quality-factor of the laterally driven electrostatic repulsive-force microactuator, driven by a lateral repulsive-force generated by the asymmetry of planar electric field. The quality-factor of the repulsive-force microactuator using a creeping flow model of the ambient air is evaluated. By fitting the simulation results of damping force, we evaluate the dimensionless damping force, thereby obtaining an analytical damping force in the form of F = μαUL, where μ, α, U and L denote the air viscosity, the dimensionless damping force, the velocity and the characteristic length of the movable electrodes. The measured quality-factor increases from 12 to 13 for the bias voltage increased from 60V to 140V. The theoretical quality-factor estimated from the creeping flow model increases from 14.9 to 18.7. Characteristics of quality-factor of the repulsive-force microactuator have been discussed and compared with those of the conventional attractive-force microactuator.

Siphon Flows in Stratified Coronal Loops

1994 ◽  
Vol 144 ◽  
pp. 185-187
Author(s):  
S. Orlando ◽  
G. Peres ◽  
S. Serio
Keyword(s):  
Heat Flux ◽  
Scaling Laws ◽  
Flow Model ◽  
Supersonic Flows ◽  
Coronal Loops ◽  
Characteristic Parameters

AbstractWe have developed a detailed siphon flow model for coronal loops. We find scaling laws relating the characteristic parameters of the loop, explore systematically the space of solutions and show that supersonic flows are impossible for realistic values of heat flux at the base of the upflowing leg.

500 An in vitro steady flow model of mitral regurgitation by three-dimensional Doppler

1999 ◽  
Vol 1 ◽  
pp. S86-S86
Author(s):  
R DESIMONE ◽  
G GLOMBITZA ◽  
C VAHL ◽  
H MEINZER ◽  
S HAGL
Keyword(s):  
Mitral Regurgitation ◽  
Steady Flow ◽  
Flow Model ◽  
Three Dimensional

NÉEL LINES STRUCTURES IN UNIAXIAL FERROMAGNETS WITH QUALITY FACTOR Q > 1

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1947-C8-1948
Author(s):  
J. Miltat ◽  
P. Trouilloud
Keyword(s):  
Quality Factor ◽  
Quality Factor Q
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