Experimental study on contribution of clustering structure to surface tension change of magnetic fluid under magnetic field

2020 ◽  
Vol 499 ◽  
pp. 166285
Author(s):  
Masaaki Motozawa ◽  
Soichiro Ishii ◽  
Mitsuhiro Fukuta
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Surface Tension ◽  
Magnetic Fluid ◽  
Tension Change ◽  
Surface Tension Change

scholarly journals Magnetoviscosity of a Magnetic Fluid Based on Barium Hexaferrite Nanoplates

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1870
Author(s):  
Dmitry Borin ◽  
Robert Müller ◽  
Stefan Odenbach
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Magnetic Nanoparticles ◽  
External Magnetic Field ◽  
Shear Flow ◽  
Magnetic Fluid ◽  
Barium Hexaferrite ◽  
Dipole Interaction ◽  
Field Dependent ◽  
Fluid Behaviour

This paper presents the results of an experimental study of the influence of an external magnetic field on the shear flow behaviour of a magnetic fluid based on barium hexaferrite nanoplates. With the use of rheometry, the magnetoviscosity and field-dependent yield-stress in the fluid are evaluated. The observed fluid behaviour is compared to that of ferrofluids with magnetic nanoparticles having high dipole interaction. The results obtained supplement the so-far poorly studied topic of the influence of magnetic nanoparticles’ shape on magnetoviscous effects. It is concluded that the parameter determining the observed magnetoviscous effects in the fluid under study is the ratio V2/l3, where V is the volume of the nanoparticle and l is the size of the nanoparticle in the direction corresponding to its orientation in the externally applied magnetic field.

Influence of Fining Temperature on Glass Qualities

2011 ◽  
Vol 199-200 ◽  
pp. 1906-1911
Author(s):  
Xiao Qing Liu ◽  
Jun Lin Xie
Keyword(s):  
Surface Tension ◽  
Water Content ◽  
Soda Lime ◽  
Chemical Compositions ◽  
Chemical Analyses ◽  
Ratio Increase ◽  
Tension Change ◽  
Soda Lime Silica Glass ◽  
Wet Chemical ◽  
Surface Tension Change

To study the influence of fining temperature on glass qualities, different fining temperatures from 1400°C to 1500°C were used to prepare a series soda-lime-silica glass with identical chemical compositions. Infrared spectroscopy was used to determine the water content of glass, general analyzer of melt physical properties was used to study the viscosity and surface tension change of glass melt, microscope was carried out find glass bubbles, wet chemical analyses were used to determine the Fe2+/(Fe2++Fe3+) ratio. The results show that, generally, with the increase of fining temperature, the glass melt’s water content, bubbles number and Fe2+/(Fe2++Fe3+) ratio increase, viscosity decreases. Particularly, when the fining temperature is 1450°C, the glass has lowest water content, bubbles number, Fe2+/(Fe2++Fe3+) ratio, and viscosity, and its surface tension is largest. Among all tested fining temperature, 1450°C is the optimal fining temperature.

Nanometer-Sized Water Bridge and Pull-Off Force in AFM at Different Relative Humidities: Reproducibility Measurement and Model Based on Surface Tension Change

2017 ◽  
Vol 121 (3) ◽  
pp. 610-619 ◽  
Author(s):  
Miroslav Bartošík ◽  
Lukáš Kormoš ◽  
Lukáš Flajšman ◽  
Radek Kalousek ◽  
Jindřich Mach ◽  
...  
Keyword(s):  
Surface Tension ◽  
Water Bridge ◽  
Model Based ◽  
Tension Change ◽  
Surface Tension Change

Analysis and Experimental Study on Magnetic Fluid Seal Mechanism

2011 ◽  
Vol 492 ◽  
pp. 273-276 ◽  
Author(s):  
Hai Na Zhang ◽  
De Cai Li
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Field Distribution ◽  
Magnetic Fluid ◽  
Magnetic Field Distribution ◽  
Gas Flows ◽  
Experimental Setup ◽  
Pressure Transmission ◽  
The Magnetic Field ◽  
The Way

The authors put forward a new design of experimental setup in order to study the mechanism of magnetic fluid seal, and used Ansys to simulate the magnetic field distribution in the setup, the results prove its rationality. The experiment to study the way of pressure transmission has been done on the experimental setup. The experimental conclusion shows that pressure transmission is based on the recoverability of the magnetic fluid seal. When pressure exceeds the ability of the seal stage, there is a leak path in the magnetic fluid, and then the gas flows to the next stage, after that, the leak path disappears. Pressure transmits from one seal stage to the next one in this way.

Experimental Study on the Second-Order Buoyancy of Magnetic Fluid

2012 ◽  
Vol 512-515 ◽  
pp. 1464-1469 ◽  
Author(s):  
Xin Zhi He ◽  
De Cai Li ◽  
Wen Ming Yang ◽  
Hai Na Zhang
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Numerical Calculation ◽  
Permanent Magnet ◽  
Saturation Magnetization ◽  
Experimental Method ◽  
Magnetic Fluid ◽  
Second Order

The buoyancy principle of magnetic fluid is one of the most attractive effects of magnetic fluid statics. But it is too difficult to calculate the buoyancy directly due to the complexity of magnetic field. Moreover, numerical calculation employs too many assumptions. So in this paper the experimental method is adopted to measure the second-order buoyancy received by permanent magnet immersed in magnetic fluid, which depends on the distance between the magnet and the wall of vessel. The influence of the diameter of cylindrical vessels, the size of magnets and the saturation magnetization of magnetic fluid on the buoyancy is also analyzed qualitatively.

scholarly journals The experimental study of ferrocolloid surface tension in a magnetic field

2020 ◽  
pp. 56-64
Author(s):  
C. A. Khokhryakova ◽  
◽  
A. I. Shmyrova ◽  
I. A. Mizeva ◽  
A. V. Shmyrov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Surface Tension ◽  
Magnetic Fluid ◽  
Normal Component ◽  
Surface Elasticity ◽  
Capillary Waves ◽  
Direct Measurements ◽  
Theoretical Predictions ◽  
External Forces ◽  
The Magnetic Field

Direct measurements of surface tension, viscosity and surface elasticity under the action of external forces are often impossible. In many tasks, the magnetic fluid surface tension is considered to be independent of the magnitude of the applied magnetic field and is determined by the properties of the base fluid. The anisotropy of the magnetic properties at the interface due to the jump in the fluid’s magnetization suggests the dependence of the surface tension tensor on the magnetic field. In this paper, we propose a new experimental method for studying the surface tension of a magnetic fluid in an external uniform magnetic field, depending on the orientation of the magnetic field intensity towards the liquid-gas interface. The study was carried out with the help of modified capillary wave method in a magnetic field orthogonal to the liquid surface and with the ring detachment method in the case of a longitudinal field. It was shown experimentally that the surface tension of a ferrocolloid fluid base (kerosene) does not depend either on the frequency of capillary waves excitation or on intensity of an applied external magnetic field, and corresponds to the value determined with the help of a commercial tensiometer by the standard method of ring detachment. The surface tension of the ferrofluid decreases with increasing intensity of the orthogonal magnetic field interface and with increasing frequency of acoustic vibrations. However, an increase in the field strength longitudinally directed to the interface, provokes an increase in the surface tension of the magnetic fluid. The experimental results are in qualitative agreement with theoretical predictions by A. V. Zhukov: the eigenvalues of the surface tension tensor monotonically increase with the tangential magnetic field component and monotonically decrease with an increase in its normal component.

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