Numerical Modeling of Red Blood Cell Suspended in a Channel With Uniform Magnetic Field

2011 ◽  
Author(s):  
Kazuya Tatsumi ◽  
Ryo Kuroki ◽  
Kosuke Nishitani ◽  
Tomoki Arakawa ◽  
Kazuyoshi Nakabe
Keyword(s):  
Magnetic Field ◽  
Blood Cell ◽  
Red Blood Cell ◽  
High Speed ◽  
Uniform Magnetic Field ◽  
Transmembrane Protein ◽  
Video Camera ◽  
Magnetic Characteristics ◽  
Rbc Membrane ◽  
High Speed Video Camera

Numerical simulations were carried out for the red blood cell (RBC) suspended in a stationary fluid. Elastic spring model were used to calculate the RBC membrane, and finite volume method was used to solve the flow field. The magnetic effect on the RBC was model by considering the anisotropic diamagnetic susceptibility of the phospholipids and transmembrane protein. The torque produced by these components at each element edge of the mesh generated on the cell surface was first calculated, and then the force applied to each node was evaluated. Experimental measurement of the RBC behavior in microchannels was also carried out under uniform magnetic field with the intensity of 8T using microscope and high-speed video camera to validate the present computation. The numerical simulation showed that the RBC rotates and orients so that the concave surface aligned parallel to the magnetic field. This behavior and the time that was required for the RBC to fully orient agreed well with the present experimental results. These results affirm not only the validity of the present method, but also the possibility of using microchannels to evaluate the magnetic characteristics of the RBCs.

Dynamic Interfacial Phenomena at Water-Magnetic Fluid System Subject to Alternating Magnetic Field

2016 ◽  
Vol 856 ◽  
pp. 15-20
Author(s):  
Masato Nakanishi ◽  
Seiichi Sudo ◽  
Hideya Nishiyama
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Fluid ◽  
High Speed ◽  
Video Camera ◽  
Alternating Magnetic Field ◽  
Fluid System ◽  
Camera System ◽  
High Speed Video Camera ◽  
Rosensweig Instability

Responses of a magnetic fluid interface adsorbed on a small permanent magnet in water container subjected to an alternating magnetic field were studied with a high-speed video camera system. The directions of the external alternating magnetic field were parallel and anti-parallel to that of the permanent magnet. It was found that the interface of water-magnetic fluid responds to the external alternating magnetic field in elongation and contraction with Rosensweig instability at the interface. Frequency characteristics of the interface response of water-magnetic fluid system subjected to alternating magnetic field were revealed over a wide frequency band experimentally.

Vibration Characteristics of Magnetic Fluid Droplet Adsorbed to Magnetized Needlepoint in Alternating Magnetic Field

2012 ◽  
Vol 721 ◽  
pp. 108-113
Author(s):  
Sota Inomata ◽  
Seiichi Sudo ◽  
Hidemasa Takana ◽  
Hideya Nishiyama
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Magnetic Fluid ◽  
High Speed ◽  
Video Camera ◽  
Alternating Magnetic Field ◽  
Camera System ◽  
High Speed Video ◽  
High Speed Video Camera ◽  
Video Camera System

The dynamic behavior of a magnetic fluid droplet adsorbed to magnetized needlepoint in alternating magnetic field was studied with a high speed video camera system. The directions of alternating magnetic field were parallel and opposite to static magnetic field of magnetized needlepoint. It was found that the surface of magnetic fluid droplet responds to the external magnetic field in elongation and contraction. The frequency of magnetic fluid droplet oscillation was exactly same of the external magnetic field. The shape and instability oscillations of the magnetic fluid droplet were revealed experimentally.

T0201-3-1 Numerical Simulation of Red Blood Cell Suspended in a Channel with Uniform Magnetic Field

2010 ◽  
Vol 2010.8 (0) ◽  
pp. 155-156
Author(s):  
Kazuya TATSUMI ◽  
Ryo KUROKI ◽  
Tomoki ARAKAWA ◽  
Kazuyoshi NAKABE
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Blood Cell ◽  
Red Blood Cell ◽  
Uniform Magnetic Field

scholarly journals 1520 Numerical Modeling of Red Blood Cell Suspended in Fluid Under Uniform Magnetic Field

2011 ◽  
Vol 2011.24 (0) ◽  
pp. 511-512
Author(s):  
Tomoki ARAKAWA ◽  
Yuki KOMORI ◽  
Kosuke NISHITANI ◽  
Kazuya TATSUMI ◽  
Kazuyoshi NAKABE
Keyword(s):  
Magnetic Field ◽  
Numerical Modeling ◽  
Blood Cell ◽  
Red Blood Cell ◽  
Uniform Magnetic Field

Image Analysis of Human Nailfold Capillary With High Speed Digital Video Capillaroscopy

2007 ◽  
Author(s):  
H. Kuroda ◽  
M. Iribe ◽  
M. Matsubara ◽  
M. Watanabe ◽  
T. Sanada
Keyword(s):  
Blood Cell ◽  
Red Blood Cell ◽  
Blood Cells ◽  
High Speed ◽  
Digital Video ◽  
Video Camera ◽  
Center Line ◽  
Digital Video Camera ◽  
Cell Velocity ◽  
Red Blood Cell Velocity

Diagnoses of skin diseases are considerably difficult tasks due to the multiply-folded factors. Nailfold capillaroscopy has been developed to diagnosis microvascular disturbances mainly in connective tissue diseases, including systemic sclerosis, dermatomyositis, systemic lupus erythematosus, and Raynaud’s phenomenon. Capillaroscopy is non-invasive, easy to use, low cost and suitable for observation of these typical phenomena. We improved conventional capillaroscopy by constructing “high speed digital video capillaroscopy”, by integrating high speed digital video camera, deep-focus zoom lens, appropriate light source and light collecting adaptor. High speed digital video camera enabled us to observe the individual red blood cell in human nailfold capillary in vivo. The light collecting adaptor is effective for preventing skin from excessive light exposure, which causes serious damage. The first objective of this study is to extract the shape of nailfold capillary quantitatively by using binarization and the level-set method. By using the level-set method, the function, which distinguishes outside from inside of the capillary and also evaluates radius distribution along the capillary center line, is calculated. Based on this mathematical description of capillary shape, more rigorous definition of the capillary red blood cell velocity than the conventional method is obtained. The second objective of this study is to propose the innovative measurement method of red blood cell velocity in nailfold capillary. As plasma gaps show high brightness we trace them and estimate the velocities of blood cells on the center line of capillary. The last objective of this study is to observe the behavior of red blood cell. We evaluate the movement of individual red blood cell, not only in the axial direction but also the lateral direction. We analyze the series of images of red blood cells in capillary and discuss their behavior.

Characteristics in the Opening and Closing Operations of Micro Magnetic Fluid Diaphragm Mechanism by Alternating Magnetic Field

2016 ◽  
Vol 856 ◽  
pp. 26-31 ◽  
Author(s):  
Seiichi Sudo ◽  
Masato Nakanishi ◽  
Michihiro Shinozaki ◽  
Hideya Nishiyama
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Fluid ◽  
High Speed ◽  
Video Camera ◽  
Alternating Magnetic Field ◽  
Camera System ◽  
Response Characteristics ◽  
High Speed Video Camera ◽  
Opening And Closing

Response characteristics in the opening and closing operations of the micro magnetic fluid diaphragm mechanism by the alternating magnetic field are described. The micro magnetic fluid diaphragm mechanism was composed of a ring shaped permanent magnet and kerosene-based magnetic fluid. The driving principle of micro magnetic fluid device was based on the surface phenomena of magnetic fluid adsorbed on a permanent magnet. The opening and shutting time of diaphragm mechanism in the alternating magnetic field was measured by high-speed video camera system. The details of magnetic fluid surface response in the opening and closing operations of magnetic fluid hole were revealed experimentally.

scholarly journals Detonation effects of shallow buried explosive in sandy soil on target plate acceleration in a small-scale blast test

2018 ◽  
Vol 192 ◽  
pp. 02028
Author(s):  
Hassan Zulkifli Abu ◽  
Ibrahim Aniza ◽  
Mohamad Nor Norazman
Keyword(s):  
Sandy Soil ◽  
High Speed ◽  
Early Stage ◽  
Time History ◽  
Video Camera ◽  
Small Scale ◽  
Target Plate ◽  
Air Blast ◽  
High Speed Video Camera ◽  
The Impact

Small-scale blast tests were carried out to observe and measure the influence of sandy soil towards explosive blast intensity. The tests were to simulate blast impact imparted by anti-vehicular landmine to a lightweight armoured vehicle (LAV). Time of occurrence of the three phases of detonation phase in soil with respect to upward translation time of the test apparatus were recorded using high-speed video camera. At the same time the target plate acceleration was measured using shock accelerometer. It was observed that target plate deformation took place at early stage of the detonation phase before the apparatus moved vertically upwards. Previous data of acceleration-time history and velocity-time history from air blast detonation were compared. It was observed that effects of soil funnelling on blast wave together with the impact from soil ejecta may have contributed to higher blast intensity that characterized detonation in soil, where detonation in soil demonstrated higher plate velocity compared to what occurred in air blast detonation.

In Situ Observation Method for Quantitative Evaluation of Solidification Phenomena and Solidification Cracks during Welding

2014 ◽  
Vol 782 ◽  
pp. 3-7
Author(s):  
Kenji Shinozaki ◽  
Motomichi Yamamoto ◽  
Kohta Kadoi ◽  
Peng Wen
Keyword(s):  
High Speed ◽  
Video Camera ◽  
Solidification Cracking ◽  
In Situ Observation ◽  
High Speed Video Camera ◽  
Varestraint Test ◽  
Solidification Cracks ◽  
Observation Method ◽  
Solidification Crack

Solidification cracking during welding is very serious problem for practical use. Therefore, there are so many reports concerning solidification cracking. Normally, solidification cracking susceptibility of material is quantitatively evaluated using Trans-Varestraint test. On the other hand, local solidification cracking strain was tried to measure precisely using in-situ observation method, called MISO method about 30 years ago. Recently, digital high-speed video camera develops very fast and its image quality is very high. Therefore, we have started to observe solidification crack using in site observation method. In this paper, the local critical strain of a solidification crack was measured and the high temperature ductility curves of weld metals having different dilution ratios and different grain sizes to evaluate quantitatively the effects of dilution ratio and grain size on solidification cracking susceptibility by using an improved in situ observation method.

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