scholarly journals Statistical Theory of Turbulence by the Late Lamented Dr. Shunichi Tsugé Case Study on Flow through a Grid in Wind Tunnel

2012 ◽  
Vol 02 (04) ◽  
pp. 18-21 ◽  
Author(s):  
Takeo Nakagawa
Keyword(s):  
Statistical Theory ◽  
Wind Tunnel ◽  
Flow Through ◽  
Statistical Theory Of Turbulence

scholarly journals Statistical theory of turbulence-II

1935 ◽  
Vol 151 (873) ◽  
pp. 444-454 ◽  
Author(s):  
Geoffrey Ingram Taylor
Keyword(s):  
Statistical Theory ◽  
Wind Tunnel ◽  
National Physical Laboratory ◽  
Direction Transverse ◽  
Physical Laboratory ◽  
Statistical Theory Of Turbulence

The methods described in Part I have been used by Mr. L. F. G. Simmons, of the National Physical Laboratory, to find experimentally the correlation between the turbulent components of velocity u 0 and u y at two points distant y apart in a direction transverse to the stream. The measurements were made at mean speed U = 25 feet per second in a wind tunnel behind a honeycomb with 0·9-inch square mesh. The results are shown in fig. 1 where the ordinates are R y = ¯¯ u o u y / ¯¯ u 2 and the abscissae are the corresponding values of y . It will be seen that the R y curve is apparently rounded at the top and that R y falls to 0·08 at y = 0·38 inches. No measurements were made beyond this point, but extrapolation seems to show that R y = 0 when y is about 0·5 inches, i.e ., when y is slightly greater than 1/2M. Integrating the curve of fig. 1 the value of l 2 = ∫ 0 0.5" R y = 0·175 inch, so that l 2 /M = 0·175/0·9 = 0·195.

scholarly journals The Problem of Carbon Dioxide Emissions from Closed Coal Mine Shafts – The Overview and the Case Study

2016 ◽  
Vol 61 (3) ◽  
pp. 587-600
Author(s):  
Paweł Wrona ◽  
Józef Sułkowski ◽  
Zenon Różański ◽  
Grzegorz Pach
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emissions ◽  
Carbon Dioxide Emission ◽  
Mining Area ◽  
Emission Point ◽  
Water Pumping ◽  
Gas Hazard ◽  
Flow Through ◽  
Reporting Procedures

Abstract Greenhouse gas emissions are a common problem noticed in every mining area just after mine closures. However, there could be a significant local gas hazard for people with continuous (but variable) emission of these gases into the atmosphere. In the Upper Silesia area, there are 24 shafts left for water pumping purposes and gases can flow through them hydraulically. One of them – Gliwice II shaft – was selected for inspection. Carbon dioxide emission with no methane was detected here. Changes in emission and concentration of carbon dioxide around the shaft was the aim of research carried out. It was stated that a selected shaft can create two kinds of gas problems. The first relates to CO2 emission into the atmosphere. Possible emission of that gas during one minute was estimated at 5,11 kg CO2/min. The second problem refers to the local hazard at the surface. The emission was detected within a radius of 8m from the emission point at the level 1m above the ground. These kinds of matters should be subject to regular gas monitoring and reporting procedures.

Two-Dimensional Flow With Standing Vortexes in Ducts and Diffusers

1960 ◽  
Vol 82 (4) ◽  
pp. 921-927 ◽  
Author(s):  
Friedrich O. Ringleb
Keyword(s):  
Wind Tunnel ◽  
Potential Flow ◽  
Separation Control ◽  
Two Dimensional ◽  
Dimensional Flow ◽  
Princeton University ◽  
Two Dimensional Flow ◽  
Flow Through ◽  
Trapping Devices

The conditions for the equilibrium of two vortexes in a two-dimensional flow through a duct or diffuser are derived. Potential-flow considerations and a few basic results from viscous-flow theory are used for the discussion of the role of cusps as separation control and trapping devices for standing vortexes. The investigations are applied to cusp diffusers especially with regard to the wind tunnel of the James Forrestal Research Center of Princeton University.

scholarly journals Thermal effects of groundwater flow through subarctic fens: A case study based on field observations and numerical modeling

2016 ◽  
Vol 52 (3) ◽  
pp. 1591-1606 ◽  
Author(s):  
Ylva Sjöberg ◽  
Ethan Coon ◽  
A. Britta K. Sannel ◽  
Romain Pannetier ◽  
Dylan Harp ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Groundwater Flow ◽  
Thermal Effects ◽  
Field Observations ◽  
Flow Through
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