Measurement of turbulent flow in a narrow open channel

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Title:Measurement of turbulent flow in a narrow open channel
Creators:
Sarkar, Sankar ; sankar79_v at isical dot ac dot in; Physics and Applied Mathematics Unit, Indian Statistical Institute Kolkata, West Bengal 700108, India.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 64, 3, pp. 273-280
Uncontrolled Keywords:flow measurement, turbulent flow, dip-phenomenon, turbulent bursting, open channel flow

Abstract

The paper presents the experimental results of turbulent flow over hydraulically smooth and rough beds. Experiments were conducted in a rectangular flume under the aspect ratio b/h = 2 (b = width of the channel 0.5 m, and h = flow depth 0.25 m) for both the bed conditions. For the hydraulically rough bed, the roughness was created by using 3/8″ commercially available angular crushed stone chips; whereas sand of a median diameter d50 = 1.9 mm was used as the bed material for hydraulically smooth bed. The three-dimensional velocity components were captured by using a Vectrino (an acoustic Doppler velocimeter). The study focuses mainly on the turbulent characteristics within the dip that were observed towards the sidewall (corner) of the channel where the maximum velocity occurs below the free-surface. It was also observed that the nondimensional Reynolds shear stress changes its sign from positive to negative within the dip. The quadrant plots for the turbulent bursting shows that the signs of all the bursting events change within the dip. Below the dip, the probability of the occurrence of sweeps and ejections are more than that of inward and outward interactions. On the other hand, within the dip, the probability of the occurrence of the outward and inward interactions is more than that of sweeps and ejections.

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Title:Measurement of turbulent flow in a narrow open channel
Translated title:Measurement of turbulent flow in a narrow open channel
Creators:
Sarkar, Sankar ; sankar79_v at isical dot ac dot in; Physics and Applied Mathematics Unit, Indian Statistical Institute Kolkata, West Bengal 700108, India.
Uncontrolled Keywords:flow measurement, turbulent flow, dip-phenomenon, turbulent bursting, open channel flow
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:64
Number:3
Page Range:pp. 273-280
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8669
Item Type:Article
Deposited On:18 Aug 2016 14:26
Last Modified:18 Aug 2016 12:26

Citation

Sarkar, Sankar (2016) Measurement of turbulent flow in a narrow open channel. Journal of Hydrology and Hydromechanics, 64 (3). pp. 273-280. ISSN 0042-790X

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