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Experimental study on turbulence properties in the dual nozzle opposed impinging stream mixer
Author(s) -
Zhang Jianwei,
Yan Junjie,
Dong Xin,
Shang Panlong,
Feng Ying
Publication year - 2017
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.22662
Subject(s) - turbulence kinetic energy , nozzle , turbulence , mechanics , inlet , mixing (physics) , intensity (physics) , tuyere , stagnation temperature , kinetic energy , materials science , stagnation pressure , physics , optics , stagnation point , mach number , thermodynamics , classical mechanics , mechanical engineering , engineering , heat transfer , quantum mechanics , blast furnace , metallurgy
The impinging stream reactor currently under study, especially in processes of fluid mixing, is employed in a variety of applications that include pharmaceuticals, petroleum, and provisions. The distributions of three‐dimensional velocity fluctuation in the dual nozzle opposed impinging stream mixer were measured experimentally using laser Doppler velocimetry (LDV). The results showed that stagnation points were in proximity of the line of z = 0 under experimental conditions, but the exact positions of these stagnation points shifted with different nozzle diameters, nozzle spacing, and inlet flow rates. The distributions of RMS velocity and turbulent kinetic energy were similar in the same operating condition, but turbulence intensity changed obviously on the z axis ranging from −10 mm to 30 mm, in which region turbulence was intense and the large turbulence intensity was advantageous to mixing. The RMS velocity was influenced obviously by changing distance between nozzles, the turbulence intensity was affected greatly by the nozzle diameters, and the region of high turbulent kinetic energy which was beneficial to mixing was enlarged by increasing inlet flow rates.