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   turbulent energy dissipation rate and turbulence scales in the blade region of a self-aspirating disk impeller  
   
نویسنده stelmach j. ,musoski r. ,kuncewicz c. ,glogowski m.
منبع journal of applied fluid mechanics - 2019 - دوره : 12 - شماره : 3 - صفحه:715 -728
چکیده    Instantaneous radial and axial velocitieques of water in the tank with a self-aspirating disk impeller operating without gas dispersion were measured by the piv method. a comparison of mean square velocity pulsations confirmed previous observations that the area in which turbulence is non-isotropic is small and extends about 3 mm above and under the impeller and radially 12,5 mm from the impeller blade tip. based on velocity measurements, the distributions of energy dissipation rates were determined using the dimensional equation ε = c·u’^3/d and smagorinsky model. adoption of the results of the dimensional equation as a reference valueallowed us to determine the smagorinsky constant value. this value appeared to be smaller than the valuesgiven in the literature. it has been shown that eddies in a small space near the impeller had sufficient energy tobreak up gas bubbles flowing out of the impeller. based on the obtained energy dissipation rate distributions,appropriate turbulence scales were determined.
کلیدواژه energy dissipation rate ,turbulence scales ,selfaspirating disk impeller
آدرس lodz university of technology, faculty of process and environmental engineering wolczanska 213, poland, lodz university of technology, faculty of process and environmental engineering wolczanska 213, poland, lodz university of technology, faculty of process and environmental engineering wolczanska 213, poland, lodz university of technology, faculty of process and environmental engineering wolczanska 213, poland
پست الکترونیکی michal.glogowski@p.lodz.pl
 
     
   
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