Experimental Study on Turbulent Flow and Mixing in Counter-Flow Type T-Junction

2007 ◽  
Author(s):  
Masafumi Hirota ◽  
Hiroshi Nakayama ◽  
Sayaka Koide ◽  
Ippei Takeuchi
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Channel Flow ◽  
Channel Wall ◽  
Velocity Ratio ◽  
Main Channel ◽  
Concentration Fluctuation ◽  
Counter Flow ◽  
Rotational Oscillation ◽  
Flow Type

An experimental study was conducted on turbulent flow and mixing in a counter-flow type T-junction. We measured the velocity and concentration fields simultaneously by combining PIV and PLIF. Special attention was directed to the concentration fluctuation near the channel wall, which might bring about the high-cycle thermal fatigue in case of mixing of hot and cold flows. The velocity ratio of the counter-channel flow to the main-channel flow was changed from 1.0 to 5.0. The fluorescent dye was mixed in the main-channel flow. The dominant structures of the fluctuating velocity and concentration fields that cause the concentration fluctuation near the channel wall were analyzed by POD. It was found that the concentration fluctuation near the channel wall was caused by the superposition of the spanwise wobbling motion of the mixing interface of two flows and the rotational oscillation of the flows.

scholarly journals Experimental Study on Turbulent Flow and Mixing in Counter-Flow Type T-Junction

2008 ◽  
Vol 3 (1) ◽  
pp. 147-158 ◽  
Author(s):  
Masafumi HIROTA ◽  
Hiroshi NAKAYAMA ◽  
Sayaka KOIDE ◽  
Ippei TAKEUCHI
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Counter Flow ◽  
Flow Type

New designs for vertical slot fishways

1992 ◽  
Vol 19 (3) ◽  
pp. 402-414 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Solanki
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Slot Width ◽  
Satisfactory Performance ◽  
Vertical Slot ◽  
Hydraulic Design

This paper presents the results of an experimental study on 18 designs of vertical slot fishways. Based on these results, it appears that a width of 8b0 and a length of 10b0 for the pools, where b0 is the slot width, are satisfactory, and minor variations can be made to these dimensions without affecting their satisfactory performance. In the two general groups of designs, design 6 in the first group and designs 16 and 18 in the second group are recommended for practical use. Key words: fishways, hydraulics, turbulent flow, open-channel flow, hydraulic design.

Hydraulics of offset baffle culvert fishways

1988 ◽  
Vol 15 (6) ◽  
pp. 1043-1051 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Lodewyk
Keyword(s):  
Experimental Study ◽  
Velocity Field ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Equation

This paper presents the results of an experimental study on the hydraulics of culverts with offset baffles to pass fish. Using analytical considerations and experimental observations, a flow equation has been developed between the discharge, diameter, depth, and slope for a culvert fish way with the standard offset baffle system. The velocity field at the slot has also been evaluated. Some further experiments were performed to assess the effect of baffle spacing and height on the hydraulics of the culvert fishway. Key words: culverts, fishways, baffles, hydraulics, open-channel flow, turbulent flow.

410 Experimental Study on Heat Transfer Characteristics of Counter Flow Type of Heat Exchanger

2008 ◽  
Vol 2008.18 (0) ◽  
pp. 342-345
Author(s):  
Touru Kakegawa ◽  
Masato Hunakoshi ◽  
Kouki Kishinami ◽  
Himsar Ambarita ◽  
Jyun Suzuki ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Heat Exchanger ◽  
Heat Transfer Characteristics ◽  
Counter Flow ◽  
Flow Type ◽  
Transfer Characteristics

Hydraulics of culvert fishways IV: spoiler baffle culvert fishways

1991 ◽  
Vol 18 (1) ◽  
pp. 76-82 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
S. Lodewyk
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Flow Rate ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Depth

This paper presents the results of an experimental study on the hydraulics of culvert fishways with spoiler baffles. Four designs were studied with the heights of the baffles equal to 0.09D and 0.15D and longitudinal spacings of 0.53D and 1.06D, where D is the diameter of the culvert. Design equations have been developed relating the flow depth to the flow rate, the diameter and the slope of the culvert for each baffle design. Expressions have also been found for the barrier velocity. Key words: culverts, fishways, hydraulics, turbulent flow, open-channel flow.

Incipient-boiling Superheats for Sodium in Turbulent Channel Flow: Effect of Rate of Temperature Rise

1973 ◽  
Vol 95 (2) ◽  
pp. 159-165 ◽  
Author(s):  
O. E. Dwyer ◽  
G. Strickland ◽  
S. Kalish ◽  
P. J. Hlavac ◽  
G. A. Schoener
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Experimental Method ◽  
Channel Flow ◽  
Temperature Rise ◽  
Turbulent Channel Flow ◽  
Control Temperature ◽  
Flow Effect ◽  
Temperature Ramp ◽  
And Control

Using sodium, an experimental study was carried out to determine the effect of rate of temperature rise on the incipient-boiling superheat for fully developed, forced turbulent flow. Three different methods of achieving boiling inception were used. The magnitude of the incipient-boiling superheat was found to be quite reproducible and independent of the experimental method as long as the rate of temperature rise (temperature ramp) was kept constant and kept the same. Moreover, the value of the superheat was found to have a strong dependency on the temperature ramp—the greater the ramp, the larger the superheat. The failure to carefully measure and control temperature ramp is apparently one reason why incipient-boiling-superheat data generally show so much scatter, and those from different laboratories so much disagreement.

Hydraulics of culvert fishways II: slotted-weir culvert fishways

1989 ◽  
Vol 16 (3) ◽  
pp. 375-383 ◽  
Author(s):  
N. Rajaratnam ◽  
C. Katopodis ◽  
N. McQuitty
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Key Words ◽  
Channel Flow ◽  
Open Channel ◽  
Open Channel Flow ◽  
Flow Equation ◽  
Flow Depth ◽  
General Manner

This paper presents the results of an experimental study on the hydraulics of culvert fishways with a slotted-weir baffle system. Six designs with two baffle heights and three spacings were tested. A flow equation has been developed to predict the flow depth for any given discharge, diameter, and slope. The barrier velocity that would exist at the slot in the baffles has also been predicted in a general manner. This relatively simple slotted-weir baffle system has been found to match the performance of the more complicated but frequently used offset baffle system of similar dimensions. Key words: culverts, fishways, baffles, hydraulics, turbulent flow, open-channel flow.

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