scholarly journals Implementation of micropolar fluids model and hydrodynamic behavior analysis using user-defined function in FLUENT

2020 ◽  
Vol 12 (7) ◽  
pp. 168781402094305
Author(s):  
Lian Wang ◽  
Xihua Chu ◽  
Ji Wan ◽  
Chenxi Xiu
Keyword(s):  
Poiseuille Flow ◽  
Complex Fluids ◽  
Translational Velocity ◽  
Slider Bearing ◽  
Hydrodynamic Behavior ◽  
Animal Blood ◽  
Micropolar Fluids ◽  
Fluent Software ◽  
Moving Particle

Micropolar fluids commonly represent the complex fluids with microstructure, for example, animal blood and liquid crystals. To understand the behavior of micropolar fluids and the role of micropolar parameters, different micropolar fluids models were implemented by user-defined function in the FLUENT software. The correctness of user-defined function programs was verified comparing to the analytical solution in the Poiseuille flow. Then, the hydrodynamic behavior was analyzed in the Poiseuille flow with a moving particle, slider bearing, and dam break. Numerical results show that microrotation viscosity weakens translational velocity while enhances the pressure of micropolar fluids, in addition, microrotation velocity decreases with the increase in angular viscosity.

On the Role of Transferrin in 67Ga Uptake by Tumor Cells

1988 ◽  
Vol 27 (04) ◽  
pp. 151-153
Author(s):  
P. Thouvenot ◽  
F. Brunotte ◽  
J. Robert ◽  
L. J. Anghileri
Keyword(s):  
Specific Binding ◽  
Subcellular Fractionation ◽  
Animal Blood ◽  
Tumor Bearing ◽  
Cell Structures ◽  
The Difference ◽  
Sarcoma Cells ◽  
In Vitro Uptake

In vitro uptake of 67Ga-citrate and 59Fe-citrate by DS sarcoma cells in the presence of tumor-bearing animal blood plasma showed a dramatic inhibition of both 67Ga and 59Fe uptakes: about ii/io of 67Ga and 1/5o of the 59Fe are taken up by the cells. Subcellular fractionation appears to indicate no specific binding to cell structures, and the difference of binding seems to be related to the transferrin chelation and transmembrane transport differences

Role of Functionality in Cross-Stream Migration, Structures, and Dynamics of Star Polymers in Poiseuille Flow

2020 ◽  
Vol 53 (22) ◽  
pp. 9993-10004
Author(s):  
Aiqing Liu ◽  
Zhenyue Yang ◽  
Lijun Liu ◽  
Jizhong Chen ◽  
Lijia An
Keyword(s):  
Poiseuille Flow ◽  
Star Polymers ◽  
Stream Migration

scholarly journals The Role of Endogenous Metal Nanoparticles in Biological Systems

Biomolecules ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1574
Author(s):  
Vitaly Vodyanoy
Keyword(s):  
Metal Nanoparticles ◽  
Biochemical Properties ◽  
Animal Blood ◽  
Copper Zinc ◽  
Gut Microorganisms ◽  
Crystalline Metal ◽  
Dietary Plants ◽  
Physiological And Biochemical ◽  
Proteinaceous Particles

The blood and tissues of vertebrate animals and mammals contain small endogenous metal nanoparticles. These nanoparticles were observed to be composed of individual atoms of iron, copper, zinc, silver, gold, platinum, and other metals. Metal nanoparticles can bind proteins and produce proteinaceous particles called proteons. A small fraction of the entire pool of nanoparticles is usually linked with proteins to form proteons. These endogenous metal nanoparticles, along with engineered zinc and copper nanoparticles at subnanomolar levels, were shown to be lethal to cultured cancer cells. These nanoparticles appear to be elemental crystalline metal nanoparticles. It was discovered that zinc nanoparticles produce no odor response but increase the odor reaction if mixed with an odorant. Some other metal nanoparticles, including copper, silver, gold, and platinum nanoparticles, do not affect the responses to odorants. The sources of metal nanoparticles in animal blood and tissues may include dietary plants and gut microorganisms. The solid physiological and biochemical properties of metal nanoparticles reflect their importance in cell homeostasis and disease.

Investigation of Lubrication Characteristics for a Soft Contact Lens

2019 ◽  
Vol 823 ◽  
pp. 105-109
Author(s):  
Hung Jung Tsai ◽  
Jeng Haur Horng ◽  
Chung Ming Tan
Keyword(s):  
Contact Lens ◽  
Contact Lenses ◽  
Hydrodynamic Lubrication ◽  
Tear Film ◽  
Hydrodynamic Pressure ◽  
Slider Bearing ◽  
Soft Contact ◽  
Soft Contact Lens ◽  
Lubrication Characteristics

It is popular to wear the contact lens nowadays. Also, the output value of the contact lens is estimated more than 4 billion NT dollar every year. Because the phenomena of the contact lenses are very complicated, the relevant mechanisms are not well understood. Thus, the security of contact lens needs to be further investigated. In the lubricated mechanism of the contact lens, there is a layer of tear between the contact lens and cornea. The contact lens’ behavior is akin to that of a slider bearing. The lens represents the slider, the eye plays the role of the stationary pad, and the tear film is the lubricant. Hence, hydrodynamics and contact mechanisms of a contact lens are quite a fascinating subject that is relevant to the science of tribology. In the paper, the lubrication mechanisms include the partial hydrodynamic lubrication (contact lens roughness), contact mechanics and Newtonian fluid mechanics have been established. The parameters of roughness, flow factor, tear film geometry, and hydrodynamic pressure distribution are discussed. The developed technology increases the safety of contact lens.

Lateral migration of viscoelastic droplets in a viscoelastic confined flow: role of discrete phase viscoelasticity

Soft Matter ◽  
2019 ◽  
Vol 15 (44) ◽  
pp. 9003-9010 ◽  
Author(s):  
Shamik Hazra ◽  
Sushanta K. Mitra ◽  
Ashis Kumar Sen
Keyword(s):  
Poiseuille Flow ◽  
Viscoelastic Medium ◽  
Lift Force ◽  
Reynolds Numbers ◽  
Lateral Migration ◽  
Low Reynolds Numbers ◽  
Confined Flow ◽  
Discrete Phase ◽  
Droplet Phase

We study wall and center migration of viscoelastic droplets in a Poiseuille flow of viscoelastic medium (PVP) at low Reynolds numbers (Re ≪ 1) and propose the existence of a new lift force whose origin lies in the viscoelasticity of the droplet phase.

Lubrication Theory for Micropolar Fluids

1971 ◽  
Vol 38 (3) ◽  
pp. 646-650 ◽  
Author(s):  
S. J. Allen ◽  
K. A. Kline
Keyword(s):  
Flow Field ◽  
Differential Equations ◽  
Boundary Conditions ◽  
Two Dimensional ◽  
Slider Bearing ◽  
Governing Equations ◽  
Micropolar Fluids ◽  
Linear Ordinary Differential Equations ◽  
Two Dimensional Flow ◽  
Order Of Magnitude

The equations governing the flow of a fluid with rigid, spherical substructure are summarized. A two-dimensional flow field is considered and applied to the geometry of a slider bearing. Order-of-magnitude arguments are used which reduce the governing equations to a system of coupled, linear, ordinary differential equations. The equations are solved subject to appropriate boundary conditions and the effects of substructure discussed with the help of a specific numerical example.

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