The erosion wear mechanism of liquid-solid two-phase high pressure manifold tee pipes

The wall thickness of pressure pipe is often thinned due to the erosion wear, which leads to pipe failure and even safety accidents. In particular, the tee pipe is more prone to be erosive as a key component of transferring fluid with particles. Therefore, the erosion wear mechanism of high pressure manifold tee pipe based on liquid-solid two-phase flow is studied in this paper. Firstly, the standard tee pipe geometry model is established and the grid is divided. And then grid number independence is verified by the percentage difference. According to the structural characteristics of tee pipe, the wear of the inner wall under four different port combinations is predicted. In addition, the relationship between erosion rate and wall shear stress is further analyzed by fluid velocity, particle diameter and mass flow rate. Double tee pipes geometry model was established to explore the erosion wear on the inner walls. The effects of assembly length and different port combinations on erosion wear were discussed respectively. When the inlets are fixed, the wall shear stress distribution of the downstream tee pipe is mainly affected by the outlets. The assembly length mainly affects the erosion rate of the downstream tee pipe.

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The Effect of Wall Shear Stress on Two Phase Fluctuating Flow of Dusty Fluids by Using Light Hill Technique

Water ◽

10.3390/w13111587 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1587

Author(s):

Dolat Khan ◽

Ata ur Rahman ◽

Gohar Ali ◽

Poom Kumam ◽

Attapol Kaewkhao ◽

...

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Base Fluid ◽

Perturbation Technique ◽

Fluid Velocity ◽

Dust Particles ◽

Stress Effect ◽

Parallel Plates ◽

Dusty Fluid ◽

Wall Shear

Due to the importance of wall shear stress effect and dust fluid in daily life fluid problems. This paper aims to discover the influence of wall shear stress on dust fluids of fluctuating flow. The flow is considered between two parallel plates that are non-conducting. Due to the transformation of heat, the fluid flow is generated. We consider every dust particle having spherical uniformly disperse in the base fluid. The perturb solution is obtained by applying the Poincare-Lighthill perturbation technique (PLPT). The fluid velocity and shear stress are discussed for the different parameters like Grashof number, magnetic parameter, radiation parameter, and dusty fluid parameter. Graphical results for fluid and dust particles are plotted through Mathcad-15. The behavior of base fluid and dusty fluid is matching for different embedded parameters.

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Mathematical analysis of two-phase blood flow through a stenosed curved artery with hematocrit and temperature dependent viscosity

Physica Scripta ◽

10.1088/1402-4896/ac454a ◽

2021 ◽

Author(s):

Chandan Kumawat ◽

Bhupendra Kumar Sharma ◽

Khalid Saad Mekheimer

Keyword(s):

Blood Flow ◽

Shear Stress ◽

Wall Shear Stress ◽

Mathematical Study ◽

Temperature Dependent ◽

Two Phase ◽

Temperature Dependent Viscosity ◽

Linear Temperature ◽

Wall Shear ◽

Dependent Viscosity

Abstract A two-phase blood flow model is considered to analyze the fluid flow and heat transfer in a curved tube with time-variant stenosis. In both core and plasma regions, the variable viscosity model ( Hematocrit and non linear temperature-dependent, respectively) is considered. A toroidal coordinate system is considered to describe the governing equations. The perturbation technique in terms of perturbation parameter ε is used to obtain the temperature profile of blood flow. In order to find the velocity, wall shear stress and impedance profiles, a second-order finite difference method is employed with the accuracy of 10−6 in the each iteration. Under the conditions of fully-developed flow and mild stenosis, the significance of various physical parameters on the blood velocity, temperature, wall shear stress (WSS) and impedance are investigated with the help of graphs. A validation of our results has been presented and comparison has been made with the previously published work and present study, and it revels the good agreement with published work. The present mathematical study suggested that arterial curvature increase the fear of deposition of plaque (atherosclerosis), while, the use of thermal radiation in heat therapies lowers this risk. The positive add in the value of λ1 causes to increase in plasma viscosity; as a result, blood flow velocity in the stenosed artery decreases due to the assumption of temperature-dependent viscosity of the plasma region. Clinical researchers and biologists can adopt the present mathematical study to lower the risk of lipid deposition, predict cardiovascular disease risk and current state of disease by understanding the symptomatic spectrum, and then diagnose patients based on the risk.

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WALL SLIPPAGE IN HIGH-PRESSURE CAPILLARY VISCOMETRY: EFFECTS OF MOLECULAR WEIGHT, COMPOUND COMPOSITION, AND CAPILLARY SURFACE COATING

Rubber Chemistry and Technology ◽

10.5254/rct.19.82582 ◽

2019 ◽

Vol 92 (1) ◽

pp. 186-197

Author(s):

Katja Putzig ◽

E. Haberstroh ◽

B. Klie ◽

U. Giese

Keyword(s):

High Pressure ◽

Shear Stress ◽

Wall Shear Stress ◽

Flow Behavior ◽

Polymer Melt ◽

Capillary Viscometer ◽

Molecular Weights ◽

Rubber Compounds ◽

Wall Shear ◽

Wall Slippage

ABSTRACT Flow behavior is of major importance in the extrusion processing of rubber compounds. It is evaluated by means of a series of tests on a high-pressure capillary viscometer (HCV). Adhesion between the polymer melt and the capillary wall is assumed in all current calculation models, although such adhesion does not always pertain to the case of rubber compounds. To date, no uniform model discussed in the literature on the topic extensively describes the wall slippage behavior of rubber compounds. The phenomenon of wall slippage is analyzed by determining the power-law parameters n (flow exponent) and K (consistency factor) from the flow curve in the subcritical flow range. This makes it possible to explicitly calculate first the slip velocity and then the slippage ratio relative to the total volume flow as a function of the given shear rate and temperature. The work is based on the testing of EPDM raw polymers of different molecular weights in the HCV. In addition, EPDM compounds containing either a carbon black or a softener were analyzed with regard to their flow behavior. The rheological analysis was carried out on three variously coated flow channels. It was observed that with attainment of a critical wall shear stress, the wall slippage effect becomes more pronounced; thus, occurrences of flow anomalies such as slip-stick or shark-skin significantly influence processing and flow behavior. Wall slippage effects are noticeable, however, even before the critical wall shear stress is attained.

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Entropy hemodynamics particle-fluid suspension model through eccentric catheterization for time-variant stenotic arterial wall: Catheter injection

International Journal of Geometric Methods in Modern Physics ◽

10.1142/s0219887819501640 ◽

2019 ◽

Vol 16 (11) ◽

pp. 1950164 ◽

Cited By ~ 8

Author(s):

Kh. S. Mekheimer ◽

A. Z. Zaher ◽

A. I. Abdellateef

Keyword(s):

Heat Transfer ◽

Shear Stress ◽

Temperature Distribution ◽

Wall Shear Stress ◽

Outer Cylinder ◽

Flow Characteristics ◽

Two Phase ◽

Eccentric Cylinder ◽

Wall Shear ◽

Suspension Model

Catheterization has an imperative rule in heat transfer investigations, which are frequently applied to analyze and deal with the heart transfer studies. Here, the entering of a catheter adjusts the flow of the blood and it affects the hemodynamic status in the artery region. In practical clinical cases, catheters cannot be precisely concentric with the artery. The impartial of this work is to investigate the behavior of a blood streaming characteristics, in the case of injecting the catheter eccentrically all the way through a stenotic overlapping artery. In this paper, we consider the heat transfer within the presence of blood corpuscle which has been characterized by a macroscopic two-phase model (i.e. a suspension of erythrocytes in plasma). The model here considers the blood fluid as a liquid fluid with adjourned particles in the gap bounded by the eccentric cylinder. The inside cylinder is identically rigid demonstrating the movable thin catheter and kept at constant temperature, where the outer cylinder is a taper cylinder demonstrating the artery that has overlapping stenosis and it is cooled and maintained at zero temperature. The coupled differential equations for both fluid (plasma) and particle (erythrocyte) phases have been solved. The expressions for the flow characteristics, namely, the flow rate, the impedance (resistance to flow), the wall shear stress and the temperature distribution, have been derived. The model is very useful in medicine, where the hemodynamic speed is higher for eccentric case than that of concentric one. Also, the temperature distribution and the entropy generation in the state of eccentric position are higher than in the case of the concentric position. A significant increase in the magnitude of the impedance and the wall shear stress occurs for an increase in the hematocrit, C for diseased blood.

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Two-Phase Flow in an Annular Channel With an Obstacle

Volume 3: Thermal-Hydraulics; Turbines, Generators, and Auxiliaries ◽

10.1115/icone20-power2012-54450 ◽

2012 ◽

Author(s):

O. N. Kashinsky ◽

P. D. Lobanov ◽

A. S. Kurdyumov ◽

N. A. Pribaturin

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Void Fraction ◽

Two Phase Flow ◽

Three Dimensional ◽

Annular Channel ◽

Electrochemical Technique ◽

Phase Flow ◽

Two Phase ◽

Wall Shear

Experimental study of gas-liquid two-phase flow in an annular channel is performed. The channel consisted of two coaxial tubes with the diameters of 42 and 20 mm. An obstacle covering a quarter of the channel section was placed in the channel to produce a strong three-dimensional disturbance of the flow. Gas-liquid flow was produced by injecting air bubbles at the channel entrance through a special mixer. Measurements of local wall shear stress are performed using an electrochemical technique. Measurements of time-averaged and fluctuational wall shear stress are performed at various points relative to the obstacle, this allowed to study the field of the hydrodynamic parameters of the flow. Local void fraction is measured using a conductivity probe which traversed across the channel. The distribution of local void fraction in the region downstream the obstacle is obtained. Increased values of local void fraction in the region close to the obstacle are detected. The experimental data obtained can be used for validation of existing and developing computer codes accounting for a 3-D structure of two-phase flows.

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Development of a Transient Mechanistic Two-Phase Flow Model for Wellbores

SPE Journal ◽

10.2118/142224-pa ◽

2012 ◽

Vol 17 (03) ◽

pp. 942-955 ◽

Cited By ~ 11

Author(s):

Mahdy Shirdel ◽

Kamy Sepehrnoori

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Two Phase Flow ◽

Fluid Model ◽

Flow Regimes ◽

Phase Flow ◽

Two Phase ◽

Wall Shear ◽

Two Fluid Model ◽

Two Fluid

Summary A great deal of research has been focused on transient two-phase flow in wellbores. However, there is lack of a comprehensive two-fluid model in the literature. In this paper, we present an implementation of a pseudo-compositional, thermal, fully implicit, transient two-fluid model for two-phase flow in wellbores. In this model, we solve gas/liquid mass balance, gas/liquid momentum balance, and two-phase energy balance equations to obtain five primary variables: liquid velocity, gas velocity, pressure, holdup, and temperature. This simulator can be used as a stand-alone code or can be used in conjunction with a reservoir simulator to mimic wellbore/reservoir dynamic interactions. In our model, we consider stratified, bubbly, intermittent, and annular flow regimes using appropriate closure relations for interphase and wall-shear stress terms in the momentum equations. In our simulation, we found that the interphase and wall-shear stress terms for different flow regimes can significantly affect the model's results. In addition, the interphase momentum transfer terms mainly influence the holdup value. The outcome of this research leads to a more accurate simulation of multiphase flow in the wellbore and pipes, which can be applied to the surface facility design, well-performance optimization, and wellbore damage estimation.

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The Use of Active Ionic Polymers in Dynamic Skin Friction Measurements

Volume 1 ◽

10.1115/ht-fed2004-56837 ◽

2004 ◽

Cited By ~ 4

Author(s):

Ali Etebari ◽

Barbar Akle ◽

Kevin Farinholt ◽

Matthew Bennet ◽

Donald J. Leo ◽

...

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Skin Friction ◽

Fluid Velocity ◽

Mechanical Strain ◽

Plate Boundary ◽

High Sensitivity ◽

Ionic Polymers ◽

Ionic Polymer ◽

Wall Shear

A class of wall shear stress sensors has been developed. The potential of ionic polymer membrane transducers for measuring skin friction in liquid flows is demonstrated. Ionic polymer transducers are thin polymer membranes that exhibit high sensitivity to mechanical strain, and have been shown to demonstrate sensitivities two orders of magnitude higher in charge-sensing mode than piezoelectric polymers such as PVDF. Thus, they are as sensitive to mechanical strain as piezoelectric ceramics (i.e. PZT) but have the high compliance and durability of a polymer. The application of active ionic polymers in delivering easy to implement, accurate, dynamic measurements of skin friction in harsh environments promises significant advantages over current technologies. In particular, a robust technique for measuring wall shear stress is needed to assess the effectiveness of new friction-reducing techniques, including the use of lubricants and micro-bubble injection within the viscous sublayer. Conventional technologies have been unable to provide sufficiently accurate measurements over a large range of fluid velocity fluctuation scales. Moreover, their implementation can be complicated in the case of non-flush mounting sensors, and their applicability is often limited to forgiving environments. An initial feasibility test was designed with the objective of replicating classic theoretical and experimental skin friction coefficient results for a sharp edge flat plate boundary layer. An ionic polymer and a piezoelectric film (PVDF) were evaluated for Reynolds numbers ranging from the laminar flow regime to fully turbulent flow. The PVDF sensor displayed no discernable response to wall shear. The ionic polymer sensor, however, showed significant response to wall shear and strong correlation with the Reynolds number. In addition, a Stokes oscillating plate apparatus was designed for calibration and testing of the ionic polymer sensor.

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Development of a wall shear stress integral measurement and analysis system for two-phase flow boundary layers

Review of Scientific Instruments ◽

10.1063/1.2360887 ◽

2006 ◽

Vol 77 (10) ◽

pp. 105103 ◽

Cited By ~ 7

Author(s):

Elvis E. Dominguez-Ontiveros ◽

Carlos E. Estrada-Perez ◽

Javier Ortiz-Villafuerte ◽

Yassin A. Hassan

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Boundary Layers ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Flow Boundary ◽

Measurement And Analysis ◽

Wall Shear ◽

Analysis System

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Effect of Wall Shear Stress on Two Phase Fluctuating Flow of Dusty Fluids by Solving Light Hill Technique

10.21203/rs.3.rs-145804/v1 ◽

2021 ◽

Author(s):

Dolat khan ◽

Ata ur Rahman ◽

Gohar ali ◽

Poom kummam

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Base Fluid ◽

Perturbation Technique ◽

Fluid Velocity ◽

Dust Particles ◽

Stress Effect ◽

Parallel Plates ◽

Dusty Fluid ◽

Wall Shear

Abstract On the importance of wall shear stress effect and dust fluid in the fluid problems. The aim of this paper to discover the influence of wall shear stress on dust fluids of fluctuating flow. The flow is consider between two parallel plates which are non-conducting. Due to the transformation of heat the fluid flow is generated. We consider every dust particle having spherical uniformly disperse in the base fluid. The perturb solution is obtained by applying Poincare-Lighthill perturbation technique (PLPT). The fluid velocity along with shear stress is discussed for the different parameters like Grashof number, magnetic parameter, radiation parameter and dusty fluid parameter. Graphical results for fluid and dust particles are plotted through Mathcad-15. The behavior of base fluid and dusty fluid is matching for different embedded parameters.

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