Air Ingestion by a Buckled Viscous Jet of Silicone Oil Impacting the Free Surface of the Same Liquid

2008 ◽  
Vol 100 (15) ◽  
Author(s):  
B. Pouligny ◽  
M. Chassande-Mottin
Keyword(s):  
Free Surface ◽  
Silicone Oil ◽  
Viscous Jet

Measurement of Gas Entrainment Rate From Free Surface by Vortex

2012 ◽  
Author(s):  
Yasuo Koizumi ◽  
Naosuke Ohte ◽  
Kamide Hideki ◽  
Shuji Ohno ◽  
Kei Ito
Keyword(s):  
Free Surface ◽  
High Speed ◽  
Silicone Oil ◽  
Liquid Velocity ◽  
Liquid Level ◽  
Test Fluid ◽  
Entrainment Rate ◽  
Flow State ◽  
Gas Entrainment ◽  
Test Vessel

A sodium-cooled fast breeder reactor is now at the developing stage in Japan. One concern for safety is cover gas entrainment into the sodium coolant. The gas entrainment rate into liquid by the vortex formed on the free surface was examined experimentally. Liquid flowed into a cylindrical vessel from a wall tangentially. Swirl flow was formed in the vessel, and then liquid drained from the bottom outlet of the vessel. A hollow vortex was formed on the free surface in the test vessel. Air was entrained under the free surface of the vortex and carried away from the bottom of the vessel. The flow state of the gas entrainment was visually observed by using a high speed video camera. The gas entrainment rate into liquid was measured. In the present experiments, test fluid was changed from water in the previous experiments to 20 cSt silicone oil. The liquid level in the test vessel was 25 mm in the present experiments. Only the vortex-type gas-entrainment was observed as in the previous experiments since the liquid level was low. The flow state observed at the flow visualization section of the outlet pipe was only a semi-annular flow. The initiation of the gas entrainment was delayed in the case of silicone oil compared with the case of water. The increasing rate of the gas entrainment to the liquid velocity is milder in the case of silicone oil than in the case of water.

Relation between Dynamic Pressure and Displacement of Free Surface in Two-Layer Sloshing between a Magnetic Fluid and Silicone Oil

2014 ◽  
Vol 792 ◽  
pp. 33-38 ◽  
Author(s):  
Takayoshi Ishiyama ◽  
Shunsuke Kaneko ◽  
Shinichiro Takemoto ◽  
Tatsuo Sawada
Keyword(s):  
Magnetic Field ◽  
Free Surface ◽  
Magnetic Fluid ◽  
Silicone Oil ◽  
Dynamic Pressure ◽  
Pressure Change ◽  
Pressure Transducers ◽  
Presence And Absence

We performed experiments regarding two-layer sloshing, using a magnetic fluid and silicone oil, and measured the dynamic pressure change using pressure transducers. We also investigated displacements of the free surface by comparing it with the dynamic pressure, clarifying the relation between them, both in the presence and absence of a magnetic field.

scholarly journals DETERMINACIÓN DEL COEFICIENTE DE AUTO-DIFUSIÓN SUPERFICIAL DEL HIELO IH

Anales AFA ◽  
2019 ◽  
pp. 6-9
Author(s):  
D. Stoler ◽  
M. Lado ◽  
R. Perdomo Arcila ◽  
G. Aguirre Varela ◽  
C.L. Di Prinzio
Keyword(s):  
Free Surface ◽  
Grain Boundary ◽  
Misorientation Angle ◽  
Silicone Oil ◽  
Optical Microscope ◽  
Self Diffusion

En este trabajo se estudió la evolución del ancho del surco formado por la intersección del borde de grano (BG) en una muestra de hielo bicristalina con la superficie libre de la misma. La muestra de hielo estudiada tenía una desorientación cristalina desconocida y fue sumergida en aceite de siliconas ultra puro a -5oC a fin de evitar procesos de evaporación. Se tomaron fotografías del surco cada 17 minutos durante 100 horas con un microscopio óptico y con estas imágenes se determinó la evolución del ancho del surco. Mediante ese estudio se pudo medir el coeficiente de autodifusión superficial del hielo a -5oC. In this work the evolution of the groove in a bicrystalline ice sample was studied. The groove is formed by the intersection of the grain boundary(BG) with the free surface. The ice sample studied had arbitrary misorientation angle and was immersed in ultra pure silicone oil at -5oC in order to avoid evaporation processes. Photographs of the groove was taken every 17 minutes for 100 hours with an optical microscope and the evolution of the groove was determined with these images. The coefficient of superficial self-diffusion of ice at -5oC has been measured

Internal solitary waves in a two-fluid system with a free surface

2016 ◽  
Vol 804 ◽  
pp. 201-223 ◽  
Author(s):  
Tsubasa Kodaira ◽  
Takuji Waseda ◽  
Motoyasu Miyata ◽  
Wooyoung Choi
Keyword(s):  
Free Surface ◽  
Solitary Wave ◽  
Surface Waves ◽  
Solitary Waves ◽  
Silicone Oil ◽  
Internal Solitary Wave ◽  
Internal Solitary Waves ◽  
Weakly Nonlinear ◽  
Two Fluids ◽  
Strongly Nonlinear

Internal solitary waves in a system of two fluids, silicone oil and water, bounded above by a free surface are studied both experimentally and theoretically. By adjusting an extra volume of silicone oil released from a reservoir, a wide range of amplitude waves are generated in a wave tank. Wave profiles as well as wave speeds are measured using multiple wave probes and are then compared with both the weakly nonlinear Korteweg–de Vries (KdV) models and the strongly nonlinear Miyata–Choi–Camassa (MCC) models. As the density difference between the two fluids in the experiment is relatively small (approximately 14 %), but non-negligible, special attention is paid to the effect of the boundary condition at the top surface. The nonlinear models valid for rigid-lid (RL) and free-surface (FS) boundary conditions are considered separately. It is found that the solitary wave of the FS model for a given amplitude is consistently narrower than that of the RL model and it propagates at a slightly lower speed. Due to strong nonlinearity in the internal-wave motion, the weakly nonlinear KdV models fail to describe the measured internal solitary wave profiles of intermediate and large wave amplitudes. The strongly nonlinear MCC-FS model agrees better with the measurements than the MCC-RL model, which indicates that the free-surface boundary condition at the top surface is crucial in describing the internal solitary waves in the experiment correctly. Leaving the top surface free in the experiment allows us to observe small and relatively short wave packets on the top surface, particularly when the amplitude of the internal solitary wave is large. Once excited, the wave packet is located above the front half of the internal solitary wave and propagates with a speed close to that of the internal solitary wave underneath. A simple resonance mechanism between short surface waves and long internal waves without and with nonlinear effects is examined to estimate the characteristic wavelength of modulated short surface waves, which is found to be in good agreement with the observed wavelength when nonlinearity is taken into account. Using ray theory, the evolution of short surface waves in the presence of a background current induced by an internal solitary wave is also investigated to examine the location of the modulated surface wave packet.

scholarly journals Superficial self-diffusion coefficient in Ih-ICE

2020 ◽  
Vol 10 (2) ◽  
pp. 153-160
Author(s):  
Carlos Leonardo Di Prinzio ◽  
Damian Stoler ◽  
Guillermo Aguirre Varela ◽  
Esteban Druetta
Keyword(s):  
Diffusion Coefficient ◽  
Free Surface ◽  
Grain Boundary ◽  
Silicone Oil ◽  
Optical Microscope ◽  
Boundary Groove ◽  
Self Diffusion ◽  
Self Diffusion Coefficient

The evolution of the grain boundary groove in a bicrystalline ice sample was studied in this work. The groove is formed by the intersection of the grain boundary with the free surface. The bicrystalline ice sample had an arbitrary misorientation and was immersed in ultra-pure silicone oil at -5°C in order to avoid evaporation processes. Photographs of the groove were taken every 17 minutes for 100 hours with an optical microscope and the evolution of the groove was determined from these images. Through this study, it was possible to measure the coefficient of surface self-diffusion of the ice at -5°C.

An Experiment on the Surface Stability of a Liquid Bridge

2012 ◽  
Vol 502 ◽  
pp. 249-252
Author(s):  
Ru Quan Liang ◽  
Jun Hong Ji ◽  
Fu Sheng Yan ◽  
Kawaji Masahiro
Keyword(s):  
Free Surface ◽  
Liquid Bridge ◽  
Silicone Oil ◽  
Liquid Bridges ◽  
Surface Oscillation ◽  
Surface Stability ◽  
Disk Diameter ◽  
The Stability

A liquid bridge formed between two coaxial, circular, solid disks was vibrated to study the effects of small vibrations on the stability of a free surface of the liquid bridge. The liquid bridge was vibrated by tapping its upper disk and by using a motor placed nearby. Experiments were conducted for isothermal liquid bridges of silicone oil (5 cSt) with a disk diameter of 7.0 mm. By subjecting the liquid bridge to small vibrations, the characteristics of vibration-induced surface oscillation have been clearly determined.

Effect of Physical Properties on Gas Entrainment Rate From Free Surface by Vortex (2nd Report)

2014 ◽  
Author(s):  
Yasuo Koizumi ◽  
Naosuke Ohte ◽  
Hideki Kamide ◽  
Shuji Ohno ◽  
Kei Ito
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
High Speed ◽  
Silicone Oil ◽  
Liquid Velocity ◽  
Test Fluid ◽  
Entrainment Rate ◽  
Flow State ◽  
Exit Velocity ◽  
Gas Entrainment

A sodium-cooled fast breeder reactor is now at the developing stage in Japan. One concern for safety is cover gas entrainment into the sodium coolant. The gas entrainment rate into liquid by the vortex formed on the free surface was examined experimentally. Four kinds of test fluid were used; water at 25 °C, water at 60 °C, 20 cSt silicone oil and kerosene. Gas was air. The flow state of gas entrainment was visually observed by using a high speed video camera. The gas entrainment rate into liquid was measured. Following conclusions were obtained. When exit velocity was low, bubble-type gas entrainment occurred. As the exit velocity increased, the gas entrainment type turned from the bubble type to a vortex type and gas entrainment rate considerably increased. The relation between gas entrainment rate and liquid velocity was mainly affected by the viscosity of liquid. As viscosity became large, higher exit velocity was required to get the same gas entrainment rate. The effect of surface tension on the gas entertainment rate was minor or little. No systematic trend by the surface tension was noticed in the gas entrainment rate. Present results of the onset of the bubble type gas entrainment are well expressed with both the modified Baum and the modified Takahashi et al. correlation although the modified Takahashi et al. correlation provides a little better prediction than the modified Baum correlation. A flow state at the outlet piping has significant effect on the gas entrainment rate. The dimension of the outlet piping may become important to consider the gas entrainment rate in the vortex type region.

A Thermocapillary Convection Experiment in Microgravity

1995 ◽  
Vol 117 (3) ◽  
pp. 611-618 ◽  
Author(s):  
Y. Kamotani ◽  
S. Ostrach ◽  
A. Pline
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Temperature Distribution ◽  
Laser Beam ◽  
Thermocapillary Convection ◽  
Silicone Oil ◽  
Free Surfaces ◽  
Numerical Predictions ◽  
Liquid Free Surface ◽  
Infrared Imager

Results are reported of the Surface Tension Driven Convection Experiment (STDCE) aboard the USML-1 Spacelab, which was launched on June 25, 1992. In the experiment, 10 cSt silicone oil was placed in an open 10-cm-dia circular container, which was 5 cm deep. The fluid was heated either by a cylinderical heater (1.11 cm diameter) located along the container centerline or by a CO2 laser beam to induce thermocapillary flow. Several thermistor probes were placed in the fluid to measure the temperature distribution. The temperature distribution along the liquid-free surface was measured by an infrared imager. Tests were conducted over a range of heating powers, laser-beam diameters, and free surface shapes. An extensive numerical modeling of the flow was conducted in conjunction with the experiments. Some results of the temperature measurements with flat free surfaces are presented in this paper and they are shown to agree well with the numerical predictions.

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

Use of viscodissection and silicone oil in vitrectomy for severe diabetic retinopathy

2003 ◽  
Vol 18 (3) ◽  
pp. 121-126
Author(s):  
Grigorian R.A. ◽  
Castellarin A. ◽  
Bhagat N. ◽  
Del Priore ◽  
Von Hagen ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Silicone Oil
Sign in / Sign up

Export Citation Format

Share Document