Effects of Impeller Type on Mixing Performance in Continuous Laminar Flow

2014 ◽  
Vol 47 (11) ◽  
pp. 805-814 ◽  
Author(s):  
Yusuke Suzuki ◽  
Ryuta Misumi ◽  
Kazuhiko Nishi ◽  
Meguru Kaminoyama
Keyword(s):  
Laminar Flow ◽  
Mixing Performance ◽  
Impeller Type

scholarly journals Laminar Mixing in Stirred Tank Agitated by an Impeller Inclined

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Koji Takahashi ◽  
Yoshiharu Sugo ◽  
Yasuyuki Takahata ◽  
Hitoshi Sekine ◽  
Masayuki Nakamura
Keyword(s):  
Numerical Simulation ◽  
Laminar Flow ◽  
Mixing Time ◽  
Flow Region ◽  
Experimental Results ◽  
Stirred Tank ◽  
Simulation Methods ◽  
Mixing Performance ◽  
Laminar Mixing ◽  
Numerical Simulation Methods

The mixing performance in a vessel agitated by an impeller that inclined itself, which is considered one of the typical ways to promote mixing performance by the spatial chaotic mixing, has been investigated experimentally and numerically. The mixing time was measured by the decolorization method and it was found that the inclined impeller could reduce mixing time compared to that obtained by the vertically located impeller in laminar flow region. The effect of eccentric position of inclined impeller on mixing time was also studied and a significant reduction of mixing time was observed. To confirm the experimental results, the velocity profiles were calculated numerically and two novel numerical simulation methods were proposed.

scholarly journals CFD simulation of the laminar flow in stirred tanks generated by double helical ribbons and double helical screw ribbons impellers

2011 ◽  
Vol 1 (4) ◽  
Author(s):  
Zied Driss ◽  
Sarhan Karray ◽  
Hedi Kchaou ◽  
Mohamed Abid
Keyword(s):  
Laminar Flow ◽  
Viscous Dissipation ◽  
Cfd Simulation ◽  
Stokes Equations ◽  
Fluid Dynamic ◽  
Numerical Results ◽  
Stirred Tanks ◽  
Mixing Performance ◽  
Finite Volume Discretization ◽  
Field Velocity

AbstractIn this paper, the mixing performance of double helical ribbons and double helical screw ribbons impellers mounted on stirred tanks is numerical investigated. The computer simulations are conducted within a specific computational fluid dynamic (CFD) code, based on resolution of the Naviers-Stokes equations in the laminar flow with a finite volume discretization. The field velocity and the viscous dissipation rate are presented in different vessel planes. The global characteristics and the power consumption of these impellers are also studied. The numerical results showed that the velocity field is more active with the double helical screw ribbons impeller. In this case, the effectiveness of the viscous dissipation and the pumping flow has been obviously noted. Also, the pumping and the energy efficiency reach the highest values at the same Reynolds number. The good agreement between the numerical results and the experimental data quietly confirmed the analysed method.

An Experimental Study of a Synthetic Jet in Cross Flow in a Microchannel

2010 ◽  
Author(s):  
Alexander Sinclair ◽  
John Reizes ◽  
Victoria Timchenko ◽  
Gary Rosengarten
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Cross Flow ◽  
Oscillatory Solution ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Square Duct ◽  
Transfer Rates ◽  
Mixing Performance ◽  
Jet In Cross Flow

Laminar flow limits the mixing performance and heat transfer rates that occurs within microdevices. Synthetic jets in the microscale could disrupt laminar flow and improve the performance of such devices. In this paper a synthetic microjet integrated in a microchannel was designed and fabricated using micromachining techniques. The channel flow was driven by a syringe pump at a rate of 1.39μL/s and the device was actuated using a piezoceramic disc at a frequency of 600Hz. Flow fields were measured phase locked to the actuation cycle using the MicroPIV technique in the mid plane of the jet. The resultant fields revealed a jet with a largest velocity of 2.3m/s. The average velocity during expulsion was estimated to be 0.73m/s using a comparison to the oscillatory solution to flow in a square duct. Measurements at different phases in the cycle revealed a jet strong enough to impinge on the opposing wall and the growth and decay of a pair of vortices formed at the edge of the orifice. It was also shown that the synthetic jet significantly altered the flow patterns showing promising signs for enhancing mixing and heat transfer in microchannels.

Laminar flow and chaotic advection mixing performance in a static mixer with perforated helical segments

2017 ◽  
Vol 34 (5) ◽  
pp. 1328-1336 ◽  
Author(s):  
Huibo Meng ◽  
Xiuhui Jiang ◽  
Yanfang Yu ◽  
Zongyong Wang ◽  
Jianhua Wu
Keyword(s):  
Laminar Flow ◽  
Chaotic Advection ◽  
Static Mixer ◽  
Mixing Performance

Mixing Performance Evaluation in Continuous Laminar Flow

2014 ◽  
Vol 47 (5) ◽  
pp. 363-372 ◽  
Author(s):  
Yusuke Suzuki ◽  
Ryuta Misumi ◽  
Kazuhiko Nishi ◽  
Meguru Kaminoyama
Keyword(s):  
Performance Evaluation ◽  
Laminar Flow ◽  
Mixing Performance

HYDRODYNAMICALLY DEVELOPED LAMINAR FLOW OF NON-NEWTONIAN FLUIDS INSIDE DOUBLE-SINE DUCTS

2001 ◽  
Vol 3 (2-3) ◽  
pp. 16 ◽  
Author(s):  
C. L. Chaves ◽  
Joao N. N. Quaresma ◽  
E. N. Macedo ◽  
L. M. Pereira ◽  
J. A. Lima
Keyword(s):  
Laminar Flow ◽  
Newtonian Fluids
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