Newtonian Properties Research Articles

Synthesis, Properties, and Biocompatibility of 4-Carboxyphenyboronic Acid-Modified Gelatin-Methacryloyl: A Hydrogel for Retinal Surgeries.

The current surgical adjunctive for vitreoretinal surgeries fails to provide an adequate 3D structure for cellular regeneration. A one-pot synthesis of gelatin-methacryloyl (GelMA) followed by modification with 4-carboxyphenylboronic acid (4-CPBA) was performed to fabricate 4-CPBA-modified GelMA (4CPBA@GelMA), a gelatin-based hydrogel. 4CPBA@GelMA was photo-cross-linked by 405 nm violet light and examined using nuclear magnetic resonance (NMR), Fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), and rheometry. In vitro biocompatibility was examined by Müller cell proliferation assays exposed to 4CPBA@GelMA and violet light. In vivo retinal biocompatibility was evaluated by electroretinography of rat eyes that were exposed to intravitreally injected and photo-cross-linked 4CPBA@GelMA at days 3, 7, 14, and 28 post-injection. Following electroretinography, histology and immunohistochemistry were performed on the retinas. The NMR results indicated amidation of GelMA by 4-CPBA, and FTIR confirmed the presence of the CPBA ring in 4CPBA@GelMA samples. SEM revealed that 4CPBA@GelMA had significantly larger pores than GelMA (56.9 ± 9.5 vs 35.1 ± 2.8 μm; P < 0.001). Rheological findings showed that, unlike GelMA and gelatin, 4CPBA@GelMA has Newtonian fluid properties at room temperature. Exposure to 4CPBA@GelMA did not significantly affect Müller cell viability in a proliferation assay; moreover, electroretinography findings indicated normal waveforms and implicit times, and histology and immunohistochemistry examinations revealed no significant changes. In this study, we established the high retinal compatibility of 4CPBA@GelMA. The low viscosity of 4CPBA@GelMA is ideal for injection via small-gauge needles, and the larger pore size and three-dimensional network both potentiate cellular migration and growth. These features made 4CPBA@GelMA a candidate for vitreoretinal surgical adjunctive that might promote retinal regeneration.

Comparison of Laminar and Turbulent K–Omega Shear Stress Transport Models Under Realistic Boundary Conditions Using Clinical Data for Arterial Stenosis

Abstract Early diagnosis of cardiovascular diseases (CVDs), including arterial stenosis, enables targeted treatments that reduce CVD mortality. It is vital to improve the accuracy of early diagnostic tools. Current computational studies of stenosis use mathematical models, such as laminar and k–omega shear stress transport (SST) models, available in ansys (Fluent and CFX), openfoam, and comsol software packages. Users can adjust boundary conditions, such as inlet velocity and outlet pressure using user-defined functions (UDFs) with different expressions and constant values. However, currently there is no rule over what to impose at these boundaries, and previous studies have used various assumptions, such as rigid artery wall, one-way fluid–structure interaction (FSI) or two-way FSI, and the blood's Newtonian or non-Newtonian material properties. This variety in construction has associated deviations of the models from the clinical data and lessens the value of the models as potential diagnostic or predictive tools for medical practitioners. In this study, we examine arterial stenosis models, with severities of 20%, 40%, and 50%, compared with the healthy artery analyzed in terms of strain energy to the artery wall. Additionally, we investigate elastic walls using one-way FSI, comparing with laminar and k–omega SST. These boundary conditions are based on clinical data. The results regarding the strain energy (mJ) behavior along the artery wall show that the k–omega SST model outperforms the laminar model for short arterial segments and under the Newtonian assumption with a no-slip boundary wall and turbulent flow.

Effects of Adding Pectin to Milk in Varying Amounts on the Rheological Properties of Milk

Pectin, which is used as an additive in the food, cosmetics, pharmaceutical, and health sectors due to its safety, non-toxicity, low production cost, and high availability, is used as a thickener, gelling agent, brightener, stabilizer, emulsifier, and fat and sugar replacer in low-calorie foods. It is also used in milk and dairy products as a stabilizer to prevent proteins from clumping. In this study, the rheological properties of pectin and milk mixtures with pectin/milk powder (w/w) ratios of 0.1, 0.25, 0.5, 0.75, 1 and 1.5 were examined. First, a flow curve test was applied in the range of 0,01-1000 s-1 to obtain the viscosity curves and yield stress values of the samples. Then, an amplitude sweep test was performed at a fixed frequency of 10 rad/s and in the strain range of 0.01-100% to determine the linear viscoelastic range (LVR) of the samples and the solid and liquid structure of the samples. To determine the time-dependent behavior of the samples in non-destructive deformation, frequency sweep tests were performed at constant strain (0.01%) in the LVR range obtained from the amplitude sweep test and in the range of 0.1-100 rad/s. Finally, three interval thixotropy tests (3ITT) were performed to observe the structural recovery of the samples. As a result of rheological tests, it was determined that pectin-free milk showed Newtonian properties, other samples showed shear thinning properties, and viscosity values increased as the pectin rate increased. While all samples are solid at low strains, the liquid feature becomes dominant at high strains. It has been observed that as the pectin ratio in milk increases, the strain values at the yield point, where the liquid feature becomes dominant, also increase. Except for the sample with the highest pectin content, it was observed that the dominance of the storage modulus over the loss modulus was greater at low frequencies than at high frequencies. As a result of 3ITT, it was determined that the percentage of recovery at the 600th second increased as the pectin rate increased.

Newtonian Property of Subgradient Method with Optimization of Metric Matrix Parameter Correction

Newtonian Property of Subgradient Method with Optimization of Metric Matrix Parameter Correction

Characterization, rheological behaviour, and dynamic viscosity of ZrO2-SiC (50–50)/DW hybrid nanofluid under different temperatures and solid volume fractions: An experimental study and proposing a new correlation

Researchers, engineers, scientists, and other professionals have been focusing on the exploitation of nanotechnology with specific attention to nanofluids and their property of dynamic viscosity that can do wonders in the field of engineering. This study was aimed at determining the dynamic viscosity of the given hybrid nanofluid (distilled water based ZrO2/SiC) by studying the nanofluid's rheology. In this regard, a two-step method was employed for the dispersal of nanoparticles in the base fluid. The nano-powder was composed of ZrO2 and SiC in a ratio of 1:1 (50% - 50%). The dynamic viscosity of solid volume fractions 0.025% - 0.1% was measured in temperatures 20–60 °C by using DV2TRVTBG Brookfield digital viscometer. The research indicated the association between the nanofluid's viscosity and the factors of temperature and solid volume fraction. At first, in order to assessment the characteristics and stability of nanoparticles into the base fluid, XRD, TEM, FESEM, EDX, UV–vis spectrometer, DLS, and zeta potential test were used on ZrO2 and SiC nanoparticles. The results indicated an increase in dynamic viscosity at higher solid concentrations and falling temperatures. The dynamic viscosity increase of the nanofluid was recorded at 20 and 60 °C, which showed a 29.6% and 64.2% rise in the viscosity respectively in the presence of 0.025% of nanoparticles in the nanofluid. This implies that the viscosity of nanoparticles becomes more sensitive at high temperatures. The experiment showed a maximum viscosity rise of 169.4%. The experiments also discovered that ZrO2-SiC /DW hybrid nanofluid can be successfully used in different devices as a Newtonian fluid since it depicts Newtonian properties at various temperatures. In addition, the study put forward a new correlation for determining the dynamic viscosity of hybrid nanofluid using the experimental data (temperature and solid volume fraction). The value of mathematical correlation accuracy was 98.92%. During the experiment, the sensitivity of viscosity in response to a rise in solid volume fraction was evaluated. Lastly, an acceptable level of accuracy of the correlation outputs was seen when the theoretical and practical values were contrasted.

Possible means of swimming of red algae spores

This article proposes a model for swimming of red algae spores. The model considers a released spore in unbound water as a spherical particle enclosing a liquid incompressible cytosol, in which oscillates a solid spherical organelle. An analysis of the solutions of the Navier-Stokes equations for the cytosol flow caused by the organelle motion within the cell is presented in the limit of small Reynolds number. It is shown that in the case when the cytosol has Newtonian or Maxwell properties, the spore may swim only when the forward and backward trajectories of the organelle are different. In the case of the shear thinning cytosol properties the spore may swim also when the organelle trajectories are the same, but the velocities of forward and backward movements of the organelle should differ. Such a cell may swim in a straight line. The swimming of the model spores completely satisfies experimental data.

Analysis of Blood Flow in Human Brain Vessels for Newtonian and Non-Newtonian Blood Properties

The cerebral artery system can be affected by various diseases such as stroke, carotid stenosis, vertebral stenosis, intracranial stenosis, aneurysms, and vascular malformations. Understanding the blood flow specific to each patient's cerebral arteries can provide crucial information about how these diseases progress and guide potential treatment options. A patient-specific Magnetic Resonance Imaging (MRI) scan of a human brain was utilized to create a 3D model of the arterial system. Blood flow simulations were conducted using the ANSYS (Fluent) R2021 software package. The ICEM meshing tool within the ANSYS software was employed to prepare the models. The velocity rise and pressure drop were observed in the branching of the basilar artery. This can provide valuable patient specific information on various cerebral diseases, and drug delivery cases. The non-Newtonian properties of blood were established by inputting the Power Law parameters into the ANSYS Fluent system. It was observed that the effects of non-Newtonian properties of blood are relatively negligible for the large vessels studied (&gt; 200 um).

TO THE QUESTION OF ACCURACY OF EVALUATION OF THE PRODUCTIVITY FACTOR OF LOW-PRODUCTION WELLS

In the practice of any exploration or oil producing enterprise, the parameters of a productive or potentially promising geological target are estimated using a method of temporary tracking and recording of a change in level/pressure based on the classical principle of sequential change of stationary states. Its main drawback against the background of wide practical application is the incorrect determination of the reliable value of the productivity coefficient (Kprod) for complex reservoir rocks, especially those with strong texture heterogeneity, which in reality is not enough to draw up high-quality and most importantly real design technological documents for the integrated development of oil and gas fields. Hence the large degree of conventionality of the results obtained during office processing, as well as various opinions among specialists on the problems of interpretation of hydrodynamic studies of wells. The special literature on oilfield geology and hydrodynamic studies contains numerous attempts by different researchers from various sides to overcome this (significant in the opinion of the authors of the article) drawback of using the above method, but so far there have been no noticeable positive "shifts" in this direction. Everything rests on the bulkiness and complexity of the proposed analytical solutions.&#x0D; Based on many years of research, the authors of the article give their vision of solving this problem. The proposed modified grapho-analytical method of calculation in low-flow non-permeation wells that penetrated reservoir rocks with oils with Newtonian properties makes it possible to estimate the reliable value of the productivity factor of the reservoirs (Kprod) in the conditions of the formation pressure deficit that exists everywhere in the fields of the West Siberian oil and gas basin (with stationary flat-radial filtration).

Effect of Coriolis Force on Modified Eyring Powell Fluid flow

Recently, it has been shown that under certain conditions, the Eyring-Powell fluid model can exhibit shearthickening properties without losing the known Newtonian or shear-thinning properties. The Eyring-Powell and Modified Eyring-Powell fluids have shown great potential in enhancing armour production and reducing the cost of maintenance for bullet proof vests. The Coriolis force, on the other hand, explains natural phenomena such as the direction of cyclones and the true direction of sun rays on earth. In this paper, the shear-thinning properties of the Eyring-Powell fluid is explored under the action of Coriolis force. The flow is modelled as a system of PDEs which are transformed into a system of ODEs by means of similarity variables. A numerical solution of the equations are sought using the Runge-Kutta scheme alongside the Shooting technique. The effects of the Eyring-Powell fluid parameter and Coriolis force are explored on the flow velocity and flow temperature and the results are illustrated as graphs. The outcomes show that temperature increases with increasing Coriolis force but flow velocity decreases as Coriolis force increases.

Bioconvective Peristaltic Transport of a Nano Eyring-Powell Fluid in a Vertical Asymmetric Channel with Gyrotactic Microorganism

Peristaltic nanofluid’s flow due to the enhanced thermal performances of nanoparticles and their importance in many sectors play a vital role in medicine, cosmetics, manufacturing, and engineering processes. In this regard, the current theoretical work examines the swimming behavior of migratory gyrotactic microorganisms in a non- Newtonian blood-based nanofluid that is subjected to a magnetic field. The addition of motile microorganisms improves heat and mass transmission by stabilizing the nanoparticle suspension created by the combined actions of buoyancy force and magnetic field. This fluid pattern may display both Newtonian and non-Newtonian fluid properties. Continuity, temperature, motile microbe, momentum, and concentration equations are used in the mathematical formulation. The series solutions are found using the perturbation technique, and the leading parameters are described using graphs. Further, the impact of various physical constraints on different physiological quantities is addressed and illustrated through graphs and is pondered in detail. Bioconvection reduces the density of gyrotactic bacteria, according to the findings. Such findings are beneficial to biomedical sciences and engineering. Microorganisms are helpful in the breakdown of organic matter, the production of oxygen, and the maintenance of human health.

Mathematical Modeling and Analysis of the Steady Electro-Osmotic Flow of Two Immiscible Fluids: A Biomedical Application

The in vitro fabrication of big osteoarticular implants integrating biomaterials and cells is of tremendous interest because these tissues have a limited ability to regenerate. However, the growth of such cells in vitro is highly problematic, especially later in the culture, when the extracellular matrix has almost filled the initial porous network. Thus, the fluid flow required to properly perfuse the sample cannot be obtained by the hydraulic driving force alone. Fluid pumping is a central concern of a microfluidic system and electro-osmotic pumps (EOPs) are commonly employed for this purpose. Using electro-kinetic equations as a basis, this study analyzed the variations of a two-fluid electro-osmotic flow of viscoelastic fluid flow through a channel. The behavior of the fluid was studied through the Ellis equation. This is how the electro-osmotic pump functions, as demonstrated in the literature that it electrically drags a conducting fluid across a non-conducting fluid through interfacial dragging force along the channel. A steady-state analytical solution for the system in a conducting fluid channel was studied by undertaking an interface planner for fluids exhibiting Newtonian rheological properties. The pumping characteristics were studied in detail by using the Ellis model’s parameters. The fluid rheology was studied, which showed the viability of this technique.

Dermal and Transdermal Macromolecule Delivery Using Enhancer Molecules and Colloidal Carrier Systems – Part 2: Percutaneous Administration of Heparin

Introduction: Heparin is a commonly used anti-coagulant administered either by intravenous or subcutaneous injection for a systemic effect or topically for the treatment of peripheral vascular disorders. Objective: This study aimed to formulate heparin in non-ionic colloidal carrier systems (CCSs) having enhanced percutaneous absorption for systemic and topical administration. Methods: Five CCSs were developed and characterized for their rheological properties, droplet size, and drug loading. The percutaneous absorption of heparin was evaluated in vitro using Franz diffusion cells with rats’ skin and with the aid of a developed high-pressure chromatography method. Furthermore, the efficacy of two developed heparin CCSs was tested percutaneously in rats by measuring the response against the time in comparison to subcutaneous administration. Results: The rheograms and droplet size measurements showed that the developed drug delivery systems have Newtonian properties with a droplet size between 109 and 460 nm. As much as 500 mg of heparin could be loaded in around 5 mL of CCS. Furthermore, using Franz diffusion cells, a diffusion rate of 19.216 ± 2.01 USP U/cm².h could be achieved for heparin-loaded CCSs. Moreover, the estimated percutaneous in vivo relative bioavailability in comparison to subcutaneous administration could reflect that at least more than 50% of the drug passed through the skin. Conclusion: The developed novel non-toxic CCSs containing heparin can be good candidates for percutaneous administration as alternative delivery systems for subcutaneous and intravenous invasive administration.

Surveying the effects of concave obstacles with different edge walls on hollow glycerin droplet impacting using the volume of fluid approach

The numerical analysis of the impact of a hollow droplet on a solid concave obstacle at various heights of the edge wall and impact velocity is presented in this study. The Volume Of Fluid (VOF) approach was used to simulate hollow droplet impact using OpenFoam software. The Newtonian, incompressible, and laminar properties of the glycerin hollow droplet are assumed. Hollow droplet collision hydrodynamic behavior and jet characteristics were explored. The height of the counter jet rose as the impact velocity and height of the edge wall increased. Maximum height and length have happened to case 8 in t = 2 ms and case 3 in t = 1 ms, so the amount of it is 9.75 and 19.75 mm, minimum height and length in the last time computed is 1.4 and 2.73 mm for cases 1 and 7, respectively.

Computational fluid dynamics characterization of the hollow-cone atomization: Newtonian and non-Newtonian spray comparison

Disintegration of liquid masses in a free-surface flow is still an open question in the field of small-scale spray applications such as dispensing of detergents or sanitizing products. In this context, the pressure-swirl atomizer is widely investigated. It allows to improve several spray characteristics through the formation and breakup of a conical liquid sheet that results in the well-known hollow-cone atomization. From this perspective, the characterization of a small-scale pressure-swirl spray under laminar flow conditions is the focus of this work. The configuration of the device and the physical properties of the discharged liquid are the key parameters that modify the attributes of such multiscale flow. In this regard, the entire picture of the fragmentation process is structured into multiple stages: internal nozzle flow, outer displacement of the liquid–gas interface, droplet spread into the atmosphere, and droplet-wall interactions on a collection surface. Through the computational fluid dynamics, we analyze the influence of the main fluid/packaging parameters on the hollow-cone spray properties, and on the whole atomization process. Reynolds and Ohnesorge numbers are coupled with the Sauter mean diameter to distinguish different breakup mechanisms and spray performances. The solution of the entire spray system is performed by implementing the volume-of-fluid-to-discrete-phase-model, which allows to capture the liquid–gas interface displacement and track the droplets produced downstream the primary atomization, simultaneously. With this Eulerian–Lagrangian hybrid model, we link key features of the hollow-cone spray process to spray pattern and droplet size distribution for both Newtonian and non-Newtonian fluid properties.

Impact of Partial Slip on Double Diffusion Convection of Sisko Nanofluids in Asymmetric Channel with Peristaltic Propulsion and Inclined Magnetic Field.

The current article discusses the outcomes of the double diffusion convection of peristaltic transport in Sisko nanofluids along an asymmetric channel having an inclined magnetic field. Consideration is given to the Sisko fluid model, which can forecast both Newtonian and non-Newtonian fluid properties. Lubricating greases are the best examples of Sisko fluids. Experimental research shows that most realistic fluids, including human blood, paint, dirt, and other substances, correspond to Sisko’s proposed definition of viscosity. Mathematical modelling is considered to explain the flow behavior. The simpler non-linear PEDs are deduced by using an elongated wavelength and a minimal Reynolds number. The expression is also numerically calculated. The impacts of the physical variables on the quantities of flow are plotted graphically as well as numerically. The results reveal that there is a remarkable increase in the concentration, temperature, and nanoparticle fraction with the rise in the Dufour and thermophoresis variables.

Non-Contact And Non-Steady Rheo-Optical Measurement Of Hydrodynamic Stress Fields Inside A Cylindrical Tube

For measuring non-contact and non-steady rheo-optical measurement of hydrodynamic stress fields, we utilize a high-speed polarization camera that captures an unsteady phase-retardation field. It is known that the retardation has a proportional relationship to secondary principal stress difference. A solution of sodium iodide including crystal polymers (CNCs, cellulose nano crystals) was used as the working fluid. We have successfully measured the retardation induced by flow birefringence of CNCs without compromising the Newtonian fluid properties of the solution. In this paper, we propose a visualization technique for the retardation field of fluid in a cylindrical glass tube that incorporates index matching and discuss its comparison with the spatial intensity distribution of theoretical hydrodynamic stress field. Experimental results show that the retardation increases with an increase in flow rate. In addition, by utilizing the orientation angle data measured with the high-speed polarization camera, the vector field of principal stress difference is visualized, which is suggested to be useful for confirming the effects of direction of stresses. To investigate whether the measured retardation filed agrees with the theoretical secondary principal stress difference, the spatial intensity distribution of the two was compared. The overall trend agrees well while the retardation at the center of the tube is different, possibly owing to the effect of structure-induced retardation due to self-assembly of CNCs. The structure-induced retardation data were obtained by a combined measurement of a rotational rheometer and the high-speed polarization camera. As a result, the theoretical secondary principal stress difference distribution with considering structure-induced retardation showed better agreement with the retardation field than the case without considering it.

Unsteady forced convection flow and heat transfer past a blunt headed semicircular cylinder at low Reynolds numbers

A numerical analysis is performed to study the forced convective fluid flow and heat transfer past an unconfined semicircular cylinder. The two-dimensional simulations are carried out for Reynolds number ranging 10 ≤ Re ≤ 200 and operating fluid is air (Pr = 0.71) for Newtonian constant property fluid. Continuity, Navier-Stokes, and energy equations with appropriate boundary conditions are solved using computational fluid dynamics solver Ansys Fluent. Various parameters flow such as lift, drag, skin friction coefficient, pressure coefficient, Nusselt (Nu) number, Strouhal (St) number, and vortex strength are calculated. The transition from steady to time periodic flow occurs between Re = 60 and 80. The effect of Reynolds number on heat transfer is discussed. Finally, a developed correlation of Nu and St numbers are presented.

Entropy generation in electroosmotically aided peristaltic pumping of MoS2 Rabinowitsch nanofluid

The main emphasis of this article is to compare the heat transfer performance of two different nanofluids i.e. carboxy-methyl-cellulose (CMC) + water-based molybdenum dioxide (MoS2) nanofluid and kerosene oil-based molybdenum dioxide nanofluid during the fluid flow through a symmetric microchannel which is pumped by the mechanism of peristalsis and electroosmosis. The energy dissipated by Joule heating and viscous dissipation is also taken into account. An analysis of volumetric entropy generation is also conducted. Rabinowitsch fluid model is employed to characterize the shear-thinning behavior of CMC + water solution and Newtonian fluid properties of kerosene oil. The mathematical model for the problem is formulated by the Navier–Stokes, energy equation, and Buongiorno fluid model in combination with the Corcione model for thermal conductivity and viscosity of the nanofluid. Further, the Poisson–Boltzmann equation is utilized to compute the potential generated across the electric double layer. The homotopy perturbation technique is employed to compute the approximate solutions for temperature and nanoparticle volume fraction and exact solutions are obtained for velocity and the stream function. Salient features of the fluid flow are illustrated with the aid of graphical results. Contour plots for stream function are prepared for flow visualization. A comparison of heat transfer performance and entropy generation between both working fluids is presented. It is observed that aqueous solution modified by CMC and nanoparticles possess a higher heat transfer tendency and less entropy is generated in this case when compared with other nanofluid i.e. MoS2/kerosene oil nanofluid under the same physical conditions. It is further noted that fluid flow can be controlled by the strength of the applied electric field. Upon increasing electroosmotic parameters, there is a very minute rise in volumetric entropy generation in the case of MoS2/CMC + water nanofluid. However, there is a substantial rise in entropy generation for MoS2/kerosene oil nanofluid.

Investigation of physical properties of base and SBS modified bitumens by rheological test methods

Bitumen is modified with various modifiers to diminish the deformation occurred in flexible pavements due to traffic loads and the effects of climate. Polymer modification and more specifically Styrene-Butadiene-Styrene (SBS) copolymer modification is one of the most common methods to enhance the physical properties of bitumen. However, the polymer modified bitumens could exhibit different rheological properties compared to original bitumen. In this work, it is aimed to investigate the effects of SBS copolymer on thermorheological properties of bitumen by means of state of art test methods. To this end, a rheological program including small amplitude oscillation shear test (SAOS), construction of master curves by using time-temperature superposition (TTS) principle, determination of zero shear viscosity (ZSV) and multiple shear creep recovery tests (MSCR) were employed along with other fundamental tests. SAOS test result signifies a positive effect of SBS on the viscoelastic deformation nature of bitumen. The master curves of the complex viscosity of binders reveal that SBS modifier reduced the Newtonian flow properties of bitumen. The decrements in non-recoverable creep compliance and the increment in percent recovery signify that SBS modifier has dramatically enhanced the applicability of bitumen as a binder in flexible pavement at mid to high-temperature ranges.

RANS modeling of turbulent flow and heat transfer of non-Newtonian viscoplastic fluid in a pipe

A mathematical model of the movement and heat transfer of a turbulent non-isothermal non-Newtonian fluid through a pipe wall with a cold surrounding space has been developed and simulated numerically. Fluid turbulence is described in the framework of the isotropic two-parameter k– ε˜ model. The Newtonian properties of the fluid in the initial cross-sections of the pipe transformed gradually into a viscoplastic non-Newtonian Bingham-Schwedoff fluid state due to heat transfer through the pipe wall between the heated fluid and a cold environment. The value of its streamwise velocity in the axial zone increased significantly when the fluid moved along the pipe. On the contrary, it decreased in the near-wall zone and the height of the region with a zero fluid velocity increased. This occurred due to the viscoplastic properties of a non-Newtonian fluid. The height of the region with a zero fluid velocity in the pipe increased gradually as the non-Newtonian fluid (waxy crude oil) moved through the pipe. A noticeable increase in the level of turbulent kinetic energy in the axial zone of the pipe and its noticeable decrease in its near-wall region were observed. A significant increase in the average dynamic viscosity and yield stress in the near-wall part of the pipe was shown. The boundary of the area of existence of Newtonian properties of fluid was determined. The height of the region with a zero fluid velocity in the pipe increased gradually as waxy crude oil moved through the pipe and reached y/R ≈ 0.1 at x/D = 15.