Momentum coupling effects in a two-phase swirling jet

1997 ◽  
Author(s):  
T. Park ◽  
S. Aggarwal ◽  
V. Katta ◽  
T. Park ◽  
S. Aggarwal ◽  
...  
Keyword(s):  
Coupling Effects ◽  
Two Phase ◽  
Swirling Jet ◽  
Momentum Coupling

A lattice Boltzmann study of viscous coupling effects in immiscible two-phase flow in porous media

2007 ◽  
Vol 300 (1-2) ◽  
pp. 35-49 ◽  
Author(s):  
Andreas G. Yiotis ◽  
John Psihogios ◽  
Michael E. Kainourgiakis ◽  
Aggelos Papaioannou ◽  
Athanassios K. Stubos
Keyword(s):  
Porous Media ◽  
Lattice Boltzmann ◽  
Two Phase Flow ◽  
Flow In Porous Media ◽  
Phase Flow ◽  
Viscous Coupling ◽  
Coupling Effects ◽  
Two Phase

Turbulent Two-Phase Flows and Particle Deposition in a Duct at High Concentrations

2010 ◽  
Author(s):  
Goodarz Ahmadi ◽  
Hojjat Nasr ◽  
John B. McLaughlin
Keyword(s):  
Particle Deposition ◽  
Deposition Velocity ◽  
Particle Collision ◽  
Duct Flow ◽  
Particle Collisions ◽  
Coupling Effects ◽  
Two Phase Flows ◽  
Two Phase ◽  
Mean Velocity ◽  
Navier Stokes Equation

Two-phase flows including particle-particle collisions and two-way coupling in a turbulent duct flow were simulated using a direct simulation approach. The direct numerical simulation (DNS) of the Navier-Stokes equation was performed via a pseudospectral method was extended to cover two-way coupling effects. The effect of particles on the flow was included in the analysis via a feedback force that acted on the fluid on the computational grid points. The point particle equation of motion included the Stokes drag, the Saffman lift, and the gravitational forces. Several simulations for different particle relaxation times and particle mass loading were performed, and the effects of the inter-particle collisions and two-way coupling on the particle deposition velocity, fluid and particle fluctuating velocities, particle normal mean velocity, and particle concentration were determined. It was found that when particle-particle collisions were included in the computation, the particle deposition velocity increased. When the particle collision was neglected but the particle-fluid two-way coupling was accounted for, the particle deposition velocity decreased slightly. When both inter-particle collisions and two-way coupling effects were taken into account in the simulations, the particle deposition velocity increased. Comparisons of the present simulation results with the available experimental data and earlier numerical results are also presented.

ON THE DYNAMICS OF A TWO-PHASE, NONEVAPORATING SWIRLING JET

1998 ◽  
Vol 24 (2) ◽  
pp. 295-317 ◽  
Author(s):  
T.W. Park ◽  
V.R. Katta ◽  
S.K. Aggarwal
Keyword(s):  
Two Phase ◽  
Swirling Jet

Vapor/Droplet Coupling and the Mist Flow (OTEC) Cycle

1983 ◽  
Vol 105 (2) ◽  
pp. 181-186 ◽  
Author(s):  
C. K. B. Lee ◽  
S. L. Ridgway
Keyword(s):  
Interaction Parameter ◽  
Liquid Fraction ◽  
Energy Coupling ◽  
Vapor Flow ◽  
Two Phase ◽  
Slip Ratio ◽  
Mist Flow ◽  
High Vapor ◽  
Ocean Thermal Energy ◽  
Momentum Coupling

The present experiments have demonstrated that water droplets (∼200-μm dia) can be lifted to substantial heights (∼50 m) by their own vapor produced in flashing over temperature differences typical of the tropical seas. The coupling between the vapor and droplets is found to be excellent. The efficiency for momentum coupling is over 90 percent, and that for energy coupling is shown to vary inversely with the slip ratio. For the conditions in the present experiments, it varies from 50 to 80 percent. The momentum transfer is correlated with an interaction parameter which is the product of the liquid fraction, the slip, and the amount of flashing. For the high vapor flow cases, the pressure difference across the lift column is found to be proportional to the interaction parameter. The relevance of the two-phase flow to a class of open-cycle ocean thermal energy conversion (OTEC) schemes is considered, and the implications of the observed strong vapor/droplet coupling to the feasibility of the mist-flow OTEC cycle are discussed.

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