scholarly journals Analysis of Open-Channel Confluence Super-Critical Flow Using High Resolution Video Camera

2006 ◽  
Vol 26 (Supplement2) ◽  
pp. 13-16
Author(s):  
Takashi DEGUCHI ◽  
Ichiro FUJITA ◽  
Ryota TSUBAKI
Keyword(s):  
High Resolution ◽  
Open Channel ◽  
Video Camera ◽  
Critical Flow ◽  
Channel Confluence

scholarly journals Turbulent flow structure at a 90-degree open channel confluence: Accounting for the distortion of the shear layer

2016 ◽  
Vol 12 ◽  
pp. 130-147 ◽  
Author(s):  
Saiyu Yuan ◽  
Hongwu Tang ◽  
Yang Xiao ◽  
Xuehan Qiu ◽  
Huiming Zhang ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Shear Layer ◽  
Flow Structure ◽  
Open Channel ◽  
Turbulent Flow Structure ◽  
Channel Confluence

Sub-critical flow in open channel junction

2004 ◽  
pp. 393-400
Author(s):  
A Behrangi ◽  
S Borghei ◽  
A Daemi
Keyword(s):  
Open Channel ◽  
Critical Flow

Flow patterns in an open channel confluence with a small ratio of main channel to tributary discharge

2014 ◽  
pp. 989-996 ◽  
Author(s):  
L Schindfessel ◽  
S Creëlle ◽  
T Boelens ◽  
T De Mulder
Keyword(s):  
Open Channel ◽  
Flow Patterns ◽  
Main Channel ◽  
Small Ratio ◽  
Channel Confluence

RIGID-LID LES PREDICTIONS OF THE 3D-FLOW IN AN OPEN-CHANNEL CONFLUENCE WITH CONCORDANT AND DISCORDANT BEDS

2019 ◽  
Author(s):  
PEDRO XAVIER RAMOS ◽  
LAURENT SCHINDFESSEL ◽  
JOÃO PEDRO PÊGO ◽  
TOM DE MULDER
Keyword(s):  
Open Channel ◽  
3D Flow ◽  
Channel Confluence

Research on Fish Classification by Using High-Resolution Acoustic Video Camera-ARIS and 3-D Fish Model Simulator

2018 ◽  
Author(s):  
Zhang Yu ◽  
Katsunori Mizuno ◽  
Akira Asada ◽  
Shigeru Tabeta ◽  
Yasufumi Fujimoto ◽  
...  
Keyword(s):  
High Resolution ◽  
Video Camera ◽  
Fish Model

scholarly journals Flat vs. curved rigid-lid LES computations of an open-channel confluence

2019 ◽  
Vol 21 (2) ◽  
pp. 318-334 ◽  
Author(s):  
Pedro Xavier Ramos ◽  
Laurent Schindfessel ◽  
João Pedro Pêgo ◽  
Tom De Mulder
Keyword(s):  
Free Surface ◽  
Secondary Flow ◽  
Open Channel ◽  
Pressure Field ◽  
Large Eddy Simulations ◽  
Numerical Treatment ◽  
Mean Flow ◽  
Large Eddy ◽  
Flow Case ◽  
Channel Confluence

Abstract This paper describes the application of four Large Eddy Simulations (LES) to an open-channel confluence flow, making use of a frictionless rigid-lid to treat the free-surface. Three simulations are conducted with a flat rigid-lid, at different elevations. A fourth simulation is carried out with a curved rigid-lid which is a closer approximation to the real free-surface of the flow. The curved rigid-lid is obtained from the time-averaged pressure field on the flat rigid-lid from one of the initial three simulations. The aim is to investigate the limitations of the free-surface treatment by means of a rigid-lid in the simulation of an asymmetric confluence, showing the differences that both approaches produce in terms of mean flow, secondary flow and turbulence. After validation with experimental data, the predictions are used to understand the differences between adopting a flat and a curved rigid-lid onto the confluence hydrodynamics. For the present flow case, although it was characterized by a moderately low downstream Froude number (Fr ≈ 0.37), it was found that an oversimplification of the numerical treatment of the free-surface leads to a decreased accuracy of the predictions of the secondary flow and turbulent kinetic energy.

Enhancement of Differential Interference Contrast Images of Live Cells Obtained With Digital Cameras

1999 ◽  
Vol 5 (S2) ◽  
pp. 1112-1113
Author(s):  
M.V. Parthasarathy
Keyword(s):  
High Resolution ◽  
Contrast Enhancement ◽  
Dynamic Range ◽  
Ccd Camera ◽  
Video Camera ◽  
Live Cells ◽  
Photographic Emulsion ◽  
Digital Cameras ◽  
Structural Detail ◽  
Ccd Cameras

The usefulness of Differential Contrast Interference (DIC) light microscopy for observing fine details within transparent specimens is well known. However, when viewed by the eye or by recording with photographic emulsion, fine structural detail at the limit of resolution is often not visible because of lack of contrast. To overcome this problem, electronic contrast enhancement capabilities of video cameras have been used to enhance structural details that would otherwise be invisible. The technique, commonly referred to as VE-DIC (Video Enhanced DIC), uses first analog contrast enhancement of the image with a video camera followed by a real-time digital image processor to further enhance the image with. We are exploring the feasibility of achieving fine structural detail of live cells by directly acquiring digital images of them with a high resolution CCD camera.High resolution cooled slow-scan 12-bit CCD cameras are well suited for DIC microscopy because of their greater dynamic range than video CCD cameras that are normally 8-bits or lower.

Experimental Investigation of Free Surface Gradients in a 90° Angled Asymmetrical Open Channel Confluence

2018 ◽  
pp. 803-819 ◽  
Author(s):  
Stéphan Creëlle ◽  
Lukas Engelen ◽  
Laurent Schindfessel ◽  
Pedro X. Ramos ◽  
Tom De Mulder
Keyword(s):  
Experimental Investigation ◽  
Free Surface ◽  
Open Channel ◽  
Channel Confluence
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