Experimental study on the special shear thinning process of a kind of non-Newtonian fluid

It is known that in large vessels (whole) blood behaves as a Navier-Stokes (Newtonian) fluid; however, in a vessel whose characteristic dimension (e.g., a diameter in the range of 20 to 500 microns) is about the same size as the characteristic size of the blood cells, blood behaves as a non-Newtonian fluid, exhibiting complex phenomena, such as shear-thinning, stress relaxation, the Fahraeus effect, the plasma-skimming, etc.. Using the framework of mixture theory an Eulerian-Eulerian two phase model is applied to model blood flow, where the plasma is treated as Newtonian fluid and the RBCs are treated as shear thinning fluid.[5]

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Numerical simulations of blood cell flow in non-Newtonian fluid

MATEC Web of Conferences ◽

10.1051/matecconf/202030601006 ◽

2020 ◽

Vol 306 ◽

pp. 01006

Author(s):

Kazuhiro Shitara ◽

Toru Hyakutake

Keyword(s):

Blood Cell ◽

Red Blood Cells ◽

Newtonian Fluid ◽

Red Blood Cell ◽

Blood Cells ◽

Cell Model ◽

Flow Behavior ◽

Shear Thinning ◽

Mutual Interference ◽

Axial Concentration

We investigated how non-Newtonian viscosity behavior affects the flow characteristics of blood cells. Our findings offer insight about how shear thinning affects the dispersion of liposome-encapsulated hemoglobin and red blood cells in blood. The lattice Boltzmann method was used for fluid calculations, and the rheological properties of the non-Newtonian fluid were modeled with power-law relationships. The deformable three-dimensional red blood cell model was applied. First, we investigated the effects of shear thinning on the flow behavior of single blood cell. Simulation results indicate that shear thinning promotes the axial concentration of red blood cells. Next, varied the hematocrit to see how mutual interference between blood cells affects flow. At low hematocrit, shear thinning clearly promotes the axial concentration of red blood cells. As the hematocrit increases, in contrast, mutual interference has a greater effect, which counteracts shear thinning so the red blood cell distribution resembles the distribution within a Newtonian fluid.

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Experimental Study of Cuttings Transport with Non-Newtonian Fluid in an Inclined Well Using Visualization and ERT Techniques

10.2118/201709-ms ◽

2020 ◽

Author(s):

Mohammad Mojammel Huque ◽

Syed Imtiaz ◽

Sohrab Zendehboudi ◽

Stephen Butt ◽

Mohammad Azizur Rahman ◽

...

Keyword(s):

Experimental Study ◽

Newtonian Fluid ◽

Cuttings Transport

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Fluctuations of the non-Newtonian fluid flow in a Kenics static mixer: An experimental study

Polish Journal of Chemical Technology ◽

10.2478/v10026-008-0033-3 ◽

2008 ◽

Vol 10 (3) ◽

pp. 35-37 ◽

Cited By ~ 4

Author(s):

Sylwia Peryt-Stawiarska ◽

Zdzisław Jaworski

Keyword(s):

Experimental Study ◽

Reynolds Number ◽

Fluid Flow ◽

Newtonian Fluid ◽

Strong Dependence ◽

Reynolds Numbers ◽

Velocity Profiles ◽

Test Fluid ◽

Static Mixer ◽

Flow Fluctuations

Fluctuations of the non-Newtonian fluid flow in a Kenics static mixer: An experimental study The measurements for a Kenics static mixer were carried out using Laser Doppler Anemometer (LDA). The test fluid was non-Newtonian solution of CMC, Blanose type 9H4. The velocity data inside the 5th Kenics insert were collected for the axial components at five levels of Reynolds number, Re = 20 ÷ 120. Velocity fluctuations were also analyzed in the frequency domain, after processing them with the help of the Fast Fourier Transform (FFT) procedure. The spectra of fluctuations provided information about level of the fluctuations in the observed range of Reynolds number. The obtained data were then also used to plot the velocity profiles for the fifth insert of the Kenics mixer. It was concluded that in the investigated range of Reynolds numbers (Re = 20 ÷ 120) a strong dependence of the velocity profiles and the flow fluctuations on Reynolds number was observed.

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