scholarly journals Flow visualization of free jets by LIF method and an analysis of their structures by picture processing.

1985 ◽  
Vol 5 (18) ◽  
pp. 203-206 ◽  
Author(s):  
Tetsuo FUJIMOTO ◽  
Tomohide NI-IMI
Keyword(s):  
Flow Visualization ◽  
Picture Processing ◽  
Free Jets

scholarly journals Flow Visualization and Analysis of the Structures on Two Opposed Supersonic Free Jets by LIF Method.

1991 ◽  
Vol 57 (539) ◽  
pp. 2233-2238
Author(s):  
Tomohide NI-IMI ◽  
Tetsuo FUJIMOTO ◽  
Yutaka HARA ◽  
Kenichi IJIMA
Keyword(s):  
Flow Visualization ◽  
Free Jets

Glow-discharge flow visualization in low-density free jets

1973 ◽  
Vol 10 (10) ◽  
pp. 658-662 ◽  
Author(s):  
S. S. FISHER ◽  
D. BHARATHAN
Keyword(s):  
Glow Discharge ◽  
Flow Visualization ◽  
Low Density ◽  
Free Jets ◽  
Discharge Flow

scholarly journals Flow visualization and analysis of the structures on interacting free jets by LIF method.

1987 ◽  
Vol 7 (26) ◽  
pp. 325-330
Author(s):  
Tetsuo FUJIMOTO ◽  
Tomohide NI-IMI ◽  
Hiroshi OSADA
Keyword(s):  
Flow Visualization ◽  
Free Jets

scholarly journals Flow Visualization and Analysis of the Structures on Two Opposed Supersonic Free Jets by LIF Method

1990 ◽  
Vol 10 (Supplement2) ◽  
pp. 29-34
Author(s):  
Tomohide NI-IMI ◽  
Tetsuo FUJIMOTO ◽  
Kenichi IJIMA
Keyword(s):  
Flow Visualization ◽  
Free Jets

scholarly journals VORTEX FORMATION IN INCOMPRESSIBLE AXISYMMETRIC FREE JETS

2014 ◽  
Vol 13 (2) ◽  
pp. 74
Author(s):  
E. R. V. Del Rio ◽  
E. R. Woiski ◽  
J. J. Gasche ◽  
S. S. Mansur ◽  
E. D. R. Vieira
Keyword(s):  
Flow Visualization ◽  
Laser Sheet ◽  
Vortex Formation ◽  
Axial Distance ◽  
Flow Topology ◽  
Free Jets ◽  
Free Jet ◽  
Micro Particles ◽  
Hot Film ◽  
Hot Film Anemometry

Free jets have been utilized extensively in many industrial applications. In general jet fluid discharging from a nozzle develops flow oscillations in the shear layer. The oscillations will roll up to eventually become toroidal vortices which increase in size with the axial distance from the nozzle. In the present work, flow visualization as well as hot-film anemometry have been employed in order to study incompressible axisymmetric free jet in moderate Reynolds numbers up to 20,000. The injection of liquid dye or micro particles associated with a laser sheet turns possible to visualize the shear layers and, consequently, the vortex formation. Hot-film measurements into the jet allow determining the flow velocity profile. Flow visualization is a qualitative tool which a broad view of the flow topology. On the other hand, hot-film anemometry is a precise quantitative tool but measurement in only one location at a time. The association of flow visualization and hot-film anemometry shows very adequate for free jet studies.

Experimental study on the coherent structure of turbulent open-channel flow using visualization and picture processing

1987 ◽  
Vol 174 ◽  
pp. 399-440 ◽  
Author(s):  
Tadashi Utami ◽  
Tetsuo Ueno
Keyword(s):  
Flow Visualization ◽  
Channel Flow ◽  
Coherent Structure ◽  
Open Channel ◽  
Open Channel Flow ◽  
Wall Region ◽  
Turbulence Structure ◽  
Two Dimensional ◽  
Picture Processing ◽  
Three Components

Coherent structures of turbulent open-channel flow in the wall region of a channel bed were examined quantitatively using experimental data obtained by flow visualization. Successive pictures of flow patterns in two horizontal cross-sections at different levels near the channel bed were taken, and then were digitized and analysed by a computer.This method of flow visualization and picture processing enabled us to calculate the distributions of the three components of the velocity vectors. The distributions of velocities, streamlines, two-dimensional divergence and three components of vorticity could be calculated and are displayed as graphical output. In our numerical analyses, the idea of a two-dimensional correlation coefficient is introduced, through which the degree of similarity of turbulence structures can be better estimated than with the usual one-dimensional coefficient. Use of the data was based on the premise that the essential element in a turbulence structure is vortex motion.We propose a conceptual model of turbulence structure in which the elementary unit of coherent structure in the buffer layer is presumed to be a horseshoe vortex and in which the characteristics of the multiple structure of turbulence are shown with respect to the scale, arrangement and generating process of horseshoe vortices and longitudinal vortices. Our model clearly explains the generating mechanism and mutual relations of low-speed regions, high-speed regions, ejections, sweeps and localized free-shear layers.

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

Picture processing in orangutans (Pongo abelii)

2011 ◽  
Author(s):  
Catherine Reeve ◽  
Heidi Marsh ◽  
Suzanne MacDonald
Keyword(s):  
Picture Processing ◽  
Pongo Abelii
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