Fluidity measurement of human and synthetic analogous bloods using an electromagnetically spinning rheometry system

The electromagnetically spinning (EMS) method for viscosity measurement was enhanced for applications in a confined reaction chamber. In the reaction chamber, the immersion of the rotor into the sample might trigger the precipitation and aggregation of ingredients to the pivot of the probe rotor, which leads to harmful frictional torque of the rotation. To address this problem, an upper-point-type auto-standing probe rotor was developed and applied for the long-term measurement of the solution process of rock sugar in water. In addition, we propose the adoption of a punched board, instead of a solid board, as the lower substrate of the plate-plate-type rotational viscometer, which allows rapid exchange of the sample fluid between the interior and exterior of the narrow measurement area through molecular diffusion. We investigated the effect of punches from the perspective of the diffusion process of momentum and determined the geometrical conditions

Section: Introductionmentioning

confidence: 99%

Application of EMS system for continuous measurement of rheology in reaction chamber

Hosoda¹,

Yamakawa²,

Sakai³

2023

“…It is also effective for biohazardous materials including human organs and blood. [4][5][6][7][8][9][10][11] A recent trial for the construction of the quantum standard of viscosity is also described.…”

Section: Introductionmentioning

confidence: 99%

Introduction to rheometry for researchers of ultrasonics

Sakai

2021

Self Cite

In this paper, some recent topics on the methodology of viscoelasticity are introduced for researching ultrasonics. First, the role of viscoelasticity in ultrasonic relaxation phenomena is briefly summarized from the viewpoint of rheology. Then, the relaxation of two-dimensional viscoelasticity studied by surface light scattering experiments, which is analogous to the Brillouin scattering to detect thermal phonons, is discussed. Progress in the general method of rheometry using a rotational viscometer is also shown, in which the remote sensing of the viscosity by an electromagnetic spinning (EMS) method is described. Also examined is the possible accuracy of magneto levitated EMS, which can lead to the quantum standard of viscosity. Finally, ultrafast measurement of liquid properties, including surface tension and viscoelasticity, in which the technologies of micro liquid manipulation are employed, is introduced.

“…Many types of rheometry methods exist, 16) and we are extending various methodologies for the unique rotationaltype viscosity meter developed by us, [17][18][19][20][21][22][23][24][25][26][27][28][29] i.e. an electromagnetic spinning (EMS) viscometer that provides an accurate measurement of the low viscosities of aqueous salt solutions having a shear viscosity as low as that of pure water.…”

Section: Introductionmentioning

confidence: 99%

Extension of remote distance of electromagnetically spinning viscometer

Hosoda

Yamakawa²,

Sakai

2021

An electromagnetically spinning (EMS) viscometer enables the remote sensing of rheological properties. To date, the distance of remote sensing of EMS system has been limited by the aperture size of rotating magnets, which drive the rotation of the metal viscosity probe through electromagnetic interactions. In this study, we develop a new device that can extend the remote distance. The extender is composed of a pair of freely rotating magnets set in a confined sample container, which rotates synchronously to the main driving magnets and applies torque to the probe above the extender. The remote distance is successfully extended up to 100 mm. We carried out the viscosity measurement for lowly viscous samples and examined that the EMS system equipped with a remote distance extender works as a viscometer with a measurement accuracy of 1%.