Covariate shift method using approximated density ratios

2016 ◽  
Author(s):  
J. Pavez ◽  
C. Valle ◽  
H. Allende
Keyword(s):  
Shift Method ◽  
Density Ratios

Simulation of Laminar Liquid Jets in Gaseous Crossflow Before the Onset of Primary Breakup

2011 ◽  
Author(s):  
C.-L. Ng ◽  
K. A. Sallam
Keyword(s):  
Experimental Data ◽  
Fuel Injection ◽  
Liquid Jets ◽  
Liquid Jet ◽  
Jet Breakup ◽  
Primary Breakup ◽  
Density Ratios ◽  
First Time ◽  
Two Sides ◽  
Reduced Pressures

The deformation of laminar liquid jets in gaseous crossflow before the onset of primary breakup is studied motivated by its application to fuel injection in jet afterburners and agricultural sprays, among others. Three crossflow Weber numbers that represent three different liquid jet breakup regimes; column, bag, and shear breakup regimes, were studied at large liquid/gas density ratios and small Ohnesorge numbers. In each case the liquid jet was simulated from the jet exit and ended before the location where the experimental data indicated the onset of breakup. The results show that in column and bag breakup, the reduced pressures along the sides of the jet cause the liquid to move to the sides of the jet and enhance the jet deformation. In shear breakup, the flattened upwind surface pushes the liquid towards the two sides of the jet and causing the gaseous crossflow to separate near the edges of the liquid jet thus preventing further deformation before the onset of breakup. It was also found out that in shear breakup regime, the liquid phase velocity inside the liquid jet was large enough to cause onset of ligament formation along the jet side, which was not the case in the column and bag breakup regimes. In bag breakup, downwind surface waves were observed to grow along the sides of the liquid jet triggered a complimentary experimental study that confirmed the existence of those waves for the first time.

Peak-shift method for reducing facility cost of distribution system

2012 ◽  
Author(s):  
Hirotaka Takahashi ◽  
Katsuhiro Matsuda ◽  
Yasushi Tomita ◽  
Takashi Oda ◽  
Eri Isozaki
Keyword(s):  
Distribution System ◽  
Peak Shift ◽  
Shift Method

scholarly journals Growth Rate Exponents of Richtmyer-Meshkov Mixing Layers

2005 ◽  
Vol 73 (3) ◽  
pp. 461-468 ◽  
Author(s):  
Timothy T. Clark ◽  
Ye Zhou
Keyword(s):  
Flow Field ◽  
Power Law ◽  
Mixing Layer ◽  
Power Laws ◽  
Mixing Layers ◽  
Spatial Gradients ◽  
Power Law Exponent ◽  
Virtual Time ◽  
Time Origin ◽  
Density Ratios

The Richtmyer-Meshkov mixing layer is initiated by the passing of a shock over an interface between fluid of differing densities. The energy deposited during the shock passage undergoes a relaxation process during which the fluctuational energy in the flow field decays and the spatial gradients of the flow field decrease in time. This late stage of Richtmyer-Meshkov mixing layers is studied from the viewpoint of self-similarity. Analogies with weakly anisotropic turbulence suggest that both the bubble-side and spike-side widths of the mixing layer should evolve as power-laws in time, with the same power-law exponent and virtual time origin for both sides. The analogy also bounds the power-law exponent between 2∕7 and 1∕2. It is then shown that the assumption of identical power-law exponents for bubbles and spikes yields fits that are in good agreement with experiment at modest density ratios.

scholarly journals Suitability of the echo-time-shift method as laboratory standard for thermal ultrasound dosimetry

2017 ◽  
Author(s):  
Tina Fuhrmann ◽  
Olga Georg ◽  
Julian Haller ◽  
Klaus-Vitold Jenderka
Keyword(s):  
Time Shift ◽  
Shift Method ◽  
Echo Time

scholarly journals Resists Using the Absorption Band Shift Method for ArF Excimer Laser Lithography.

1998 ◽  
Vol 11 (3) ◽  
pp. 489-492
Author(s):  
Takeshi Okino ◽  
Koji Asakawa ◽  
Naomi Shida ◽  
Tohru Ushirogouchi
Keyword(s):  
Absorption Band ◽  
Excimer Laser ◽  
Band Shift ◽  
Shift Method ◽  
Laser Lithography ◽  
Arf Excimer Laser
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