Multiphase flow

MULTIPHASE FLOW

Multiphase flow

Multiphase flows in which more than two phases exist are encountered in a wide range fields of mechanical, chemical, civil, nuclear, biological, environmental and aerospace engineering, and our main purpose is to understand their physics and provide valuable insights to industrial problems; Processing System (e.g., liquid chemical reactor, bioreactor, air-lift system), and Biological and Environmental System (e.g., blood flow, respiratory system, weather change). Understanding their physics is very important because of the significant impact on the safety and efficiency of the thermal-fluid systems listed above.

1. Dual-nozzle Atomization

Experimental setup

Liquid atomization process

The classification of flow regimes

2. Characteristics of LSFO(Low Sulfur Fuel Oil)

Viscometer

Experimental equipment

Time history image of oil spreading (wind speed=3.5m/s, water temp.=25℃ )

Time history image of oil spreading (wind speed=3.5m/s, water temp.=25℃ )

3. Global water droplet removal

Equation of motion (for moving droplet)

Moving droplet shadowgraphy & setup

Background airflow (temporally and spatially accelerated)

4. Water entry of spheres

The water entry phenomena of roughened spheres (non-cavity-forming case)

The water entry phenomena of roughened spheres (cavity-forming case)

The cavity and splash outlines of roughened spheres (The black line has rougher surfaces)

4-1. Laser-induced cavity control behind a body of water entry

Experimental setup for laser irradiation on the sphere

Change of cavity bubble according to surface temperature (Shallow seal)

Change of cavity bubble according to surface temperature

Change of cavity bubble according to surface temperature (Deep seal)

Change of cavity bubble according to surface temperature

5. Gas-solid fluidization

Experimental setup for two-dimensional gas-solid fluidized-bed

Contour of the time average gas and solid phase bubbling-bed(left); turbulent bed(middle); fast-fluidization(right)

Pressure fluctuation near the inlet while increasing the gas flux

6. Oil/water separation

The two-dimensional simulation of the oil/water separator (ANSYS, CFX)

New oil-water separation design

The time sequence of oil/water separation process

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