An Experimental Study of Turbulent Mixing in Channel Flow Past a Grid

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F20%3A00536229" target="_blank" >RIV/61388998:_____/20:00536229 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23210/20:43960575

Result on the web

<a href="https://res.mdpi.com/d_attachment/processes/processes-08-01355/article_deploy/processes-08-01355.pdf" target="_blank" >https://res.mdpi.com/d_attachment/processes/processes-08-01355/article_deploy/processes-08-01355.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/pr8111355" target="_blank" >10.3390/pr8111355</a>

Result language

angličtina

Original language name

An Experimental Study of Turbulent Mixing in Channel Flow Past a Grid

Original language description

Grid turbulence is considered to be a canonical case of turbulent flow. In the presented paper, the flow structure is analyzed from the point of view of mixing properties, where vortical structures and their properties play a significant role. That is why the effect of various length-scales in turbulence is studied separately. The experimental study uses the Particle Image Velocimetry (PIV) method. The original method for spatial spectrum evaluation is applied. Results on vortex spatial spectrum and isotropy are presented. The scaling of turbulent kinetic energy (TKE) is measured, furthermore, the TKE is decomposed according to the length-scales of the fluctuations. By this method, we found that the decay of TKE associated with the smallest length-scales is more sensitive to the Reynolds number than that at larger length-scales. The TKE at the largest investigated length-scales decays more slowly. The turbulence decay-law is studied for various Reynolds numbers. The second and fourth statistical moments of vorticity are evaluated at various Reynolds numbers and distances from the grid. The isotropy is investigated in the sense of ratio of fluctuations in stream-wise to span-wise directions as the used data are captured using the planar PIV method. The full 3D fluctuation invariants were investigated in a representative position by means of the Stereo-PIV method.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20302 - Applied mechanics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Processes

ISSN

2227-9717

e-ISSN

—

Volume of the periodical

8

Issue of the periodical within the volume

11

Country of publishing house

CH - SWITZERLAND

Number of pages

17

Pages from-to

1355

UT code for WoS article

000593903700001

EID of the result in the Scopus database

2-s2.0-85094682053