Thermocapillary Convection in a Floating Half Zone

2012 ◽  
Vol 248 ◽  
pp. 218-223
Author(s):  
Ru Quan Liang ◽  
Wen Jun Duan ◽  
Guang Dong Duan ◽  
Ja Ba
Keyword(s):  
Free Surface ◽  
Liquid Bridge ◽  
Surface Deformation ◽  
Stokes Equations ◽  
Ambient Air ◽  
Conservation Equation ◽  
Staggered Grid ◽  
Relative Pressure ◽  
External Vibration ◽  
Free Surface Deformation

A numerical simulation has been conducted to investigate the effect of the external vibration referred to as g-jitter on the marangoni convection in liquid bridge of high Pr number fluid by taking both the dynamic free surface deformation and ambient air effects into consideration. The Navier-Stokes equations coupled with the energy conservation equation are solved on a staggered grid, and the free surface deformation is captured by introducing the mass conserving level set approach. The pressure distributions within the liquid bridge under external vibrations were investigated, and the results show that the pressure in liquid bridge presents periodic oscillation under external vibration. The closer to the hot disk, the greater the relative pressure value is. Moreover, the surface deformation and the surface amplitude under external vibration were investigated as well.

Temperature Distribution of High Prandtl Number Liquid Bridge under Zero Gravity

2013 ◽  
Vol 712-715 ◽  
pp. 1638-1641
Author(s):  
Ru Quan Liang ◽  
Shuo Yang ◽  
Jun Hong Ji ◽  
Fu Sheng Yan ◽  
Ji Cheng He
Keyword(s):  
Temperature Field ◽  
Prandtl Number ◽  
Liquid Bridge ◽  
Surface Deformation ◽  
Stokes Equations ◽  
Ambient Air ◽  
Conservation Equation ◽  
Staggered Grid ◽  
Zero Gravity ◽  
High Prandtl Number

A numerical model has been developed to investigate temperature field of high prandtl number liquid bridge under zero-gravity condition, and numerical simulations have been carried out. The Navier-Stokes equations coupled with the energy conservation equation on a staggered grid. In numerical calculations, we considered not only the free surface deformation but also the effects of ambient air. Overall numerical analysis of liquid bridge was carried out by level set method of mass conservation to capture two phase interfaces. Simultaneously, results of temperature field in liquid bridge and ambient gas-phase were given.

Flow Characteristics for High Prandtl Number Fluid under Zero Gravity

2013 ◽  
Vol 353-356 ◽  
pp. 3611-3614
Author(s):  
Ru Quan Liang ◽  
Shuo Yang ◽  
Jun Hong Ji ◽  
Ji Cheng He
Keyword(s):  
Free Surface ◽  
Flow Velocity ◽  
Liquid Bridge ◽  
Surface Deformation ◽  
Stokes Equations ◽  
Conservation Equation ◽  
Staggered Grid ◽  
Vortex Center ◽  
Zero Gravity ◽  
Two Phase

This paper investigated the flow structure in liquid bridge of high Pr Number fluid under zero gravity condition. The free surface deformation and the effects of gas phase around liquid bridge were considered. Navier-Stokes equations coupled with the energy conservation equation were solved on a staggered grid. The two-phase surface was captured by using the mass conserving level set method. The results indicated that location of vortex center move gradually toward the free surface due to thermocapillary convection. The flow velocity nearby the surface of liquid bridge is faster than the internal flow velocity, and the overall velocity level tends to decline with time evolution.

Numerical Study on High Prandtl Number Liquid Bridge

2013 ◽  
Vol 712-715 ◽  
pp. 1630-1633
Author(s):  
Ru Quan Liang ◽  
Shuo Yang ◽  
Fu Sheng Yan ◽  
Jun Hong Ji ◽  
Ji Cheng He
Keyword(s):  
Gas Phase ◽  
Liquid Bridge ◽  
Surface Deformation ◽  
Numerical Study ◽  
Mass Conservation ◽  
Ambient Air ◽  
Two Phase ◽  
High Prandtl Number ◽  
Free Surface Deformation ◽  
Ambient Gas

The overall numerical analysis of liquid bridge for high Pr number fluid and flow field of ambient air under the zero-gravity environment was carried out in the present paper. The paper used level set method of mass conservation to capture two phase interfaces. Not only the free surface deformation was considered, but also the effect of ambient gas was taken into account. Simultaneously, results of stream function in liquid bridge and ambient gas-phase were given.

Influence of Ambient Airflow on Free Surface Deformation and Flow Pattern Inside Liquid Bridge With Large Prandtl Number Fluid (Pr > 100) Under Gravity

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Shuo Yang ◽  
Ruquan Liang ◽  
Song Xiao ◽  
Jicheng He ◽  
Shuo Zhang
Keyword(s):  
Free Surface ◽  
Prandtl Number ◽  
Liquid Bridge ◽  
Thermocapillary Convection ◽  
Surface Deformation ◽  
Flow Cell ◽  
Thermocapillary Force ◽  
Flow Cells ◽  
Lower Disk ◽  
Free Surface Deformation

The influence of airflow shear on the free surface deformation and the flow structure for large Prandtl number fluid (Pr = 111.67) has been analyzed numerically as the parallel airflow shear is induced into the surrounding of liquid bridge from the lower disk or the upper disk. Contrasted with former studies, an improved level set method is adopted to track any tiny deformation of free surface, where the area compensation is carried out to compensate the nonconservation of mass. Present results indicate that the airflow shear can excite flow cells in the isothermal liquid bridge. The airflow shear induced from the upper disk impulses the convex region of free interface as the airflow shear intensity is increased, which may exceed the breaking limit of liquid bridge. The free surface is transformed from the “S”-shape into the “M”-shape as the airflow shear is induced from the lower disk. For the nonisothermal liquid bridge, the flow cell is dominated by the thermocapillary convection at the hot corner if the airflow shear comes from the hot disk, and another reversed flow cell near the cold disk appears. While the shape of free surface depends on the competition between the thermocapillary force and the shear force when the airflow is induced from the cold disk.

Influence of Vertical Vibration on Surface Velocity of a Liquid Bridge

2014 ◽  
Vol 580-583 ◽  
pp. 2890-2893
Author(s):  
Ru Quan Liang ◽  
Zhi Hui Zhang ◽  
Tai Yin Gao ◽  
Fu Sheng Yan
Keyword(s):  
Liquid Bridge ◽  
Stokes Equations ◽  
Silicone Oil ◽  
Conservation Equation ◽  
Vertical Vibration ◽  
Surface Velocity ◽  
Staggered Grid ◽  
Navier Stokes ◽  
Two Phase ◽  
Energy Conservation Equation

In this paper, the vertical vibration influence on the surface velocity of a 5cSt silicone oil liquid bridge has been investigated numerically. The Navier-Stokes equations coupled with the energy conservation equation are solved on a staggered grid, and the two-phase surface is captured by using the mass conserving level set method. The present results indicate that the axial and radial surface velocities of the liquid bridge are suppressed by the external vertical vibration.

Free-surface deformation measurement

1997 ◽  
Author(s):  
H. Stahl ◽  
Kevin Stultz ◽  
H. Stahl ◽  
Kevin Stultz
Keyword(s):  
Free Surface ◽  
Surface Deformation ◽  
Deformation Measurement ◽  
Free Surface Deformation
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