TY - JOUR
T1 - Some experimental results on velocity and vorticity measurements in turbulent grid flows with controlled sign of mean helicity
AU - Kholmyansky, M.
AU - Kit, E.
AU - Teitel, M.
AU - Tsinober, A.
N1 - Funding Information:
This research was supported by grant 8500347/3 from US-Israel Binational Science Foundation, Jerusalem, Israel. One of the authors (MK) was supported by the Center for Absorption, the Ministry of Absorption, the State of Israel A. Tsinober Jr. is acknowledged for his essential contribution in constructing the experimental facility.
PY - 1991/2
Y1 - 1991/2
N2 - We present results of experiments on turbulent grid flow in the salt water tunnel of the Laboratory for Vorticity-Helicity Studies, Faculty of Engineering, Tel Aviv University. The experiments include measurements of the longitudinal components of velocity and vorticity. This was made by a probe consisting of a seven-electrode probe, allowing to perform absolute measurements of ω1, assembled together with a commercial hot film probe. The main bulk of measurements was made past a grid with a circular mesh. This was necessary to perform experiments with controlled sign of mean helicity of the turbulent fluctuations which was achieved by installing various propellers in the grid holes. The results include mainly various helicity related quantities (mean, spectra, etc.) for grids with propellers producing perturbation clockwise, anticlockwise or both as well as for grid with empty holes. Other results like the ratio 〈sol ω12∂u1 ∂x1/〈( ∂u1 ∂x13〉 are reported. Apart from confirming the phenomenon of symmetry breaking new results about properties of the vorticity field are included.
AB - We present results of experiments on turbulent grid flow in the salt water tunnel of the Laboratory for Vorticity-Helicity Studies, Faculty of Engineering, Tel Aviv University. The experiments include measurements of the longitudinal components of velocity and vorticity. This was made by a probe consisting of a seven-electrode probe, allowing to perform absolute measurements of ω1, assembled together with a commercial hot film probe. The main bulk of measurements was made past a grid with a circular mesh. This was necessary to perform experiments with controlled sign of mean helicity of the turbulent fluctuations which was achieved by installing various propellers in the grid holes. The results include mainly various helicity related quantities (mean, spectra, etc.) for grids with propellers producing perturbation clockwise, anticlockwise or both as well as for grid with empty holes. Other results like the ratio 〈sol ω12∂u1 ∂x1/〈( ∂u1 ∂x13〉 are reported. Apart from confirming the phenomenon of symmetry breaking new results about properties of the vorticity field are included.
UR - http://www.scopus.com/inward/record.url?scp=0026105560&partnerID=8YFLogxK
U2 - 10.1016/0169-5983(91)90060-V
DO - 10.1016/0169-5983(91)90060-V
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AN - SCOPUS:0026105560
SN - 0169-5983
VL - 7
SP - 65
EP - 75
JO - Fluid Dynamics Research
JF - Fluid Dynamics Research
IS - 2
ER -