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

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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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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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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NONLINEAR AEROTHERMOELASTIC BEHAVIOR OF SKIN PANEL WITH WALL SHEAR STRESS EFFECT

Journal of Thermal Stresses ◽

10.1080/014957390523714 ◽

2005 ◽

Vol 28 (2) ◽

pp. 147-169 ◽

Cited By ~ 25

Author(s):

S. H. Pourtakdoust ◽

S. A. Fazelzadeh

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Stress Effect ◽

Wall Shear

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Physico-chemical characterization of caesium and strontium using fluorescent intensity of bacteria in a microfluidic platform

Royal Society Open Science ◽

10.1098/rsos.182069 ◽

2019 ◽

Vol 6 (5) ◽

pp. 182069

Author(s):

Changhyun Roh ◽

Thi Toan Nguyen ◽

Jae-Jin Shim ◽

Chankyu Kang

Keyword(s):

Shear Stress ◽

Wall Shear Stress ◽

Pore Space ◽

Fluid Velocity ◽

Microfluidic Devices ◽

Strontium Chloride ◽

Fluorescent Intensity ◽

Caesium Chloride ◽

Wall Shear ◽

The Impact

Recently, the impact of radioactive caesium (Cs) and strontium (Sr) on human health and the ecosystem has been a major concern due to the use of nuclear energy. However, this study observed changes in green-fluorescent (GFP)-tagged Pseudomonas aeruginosa PAO1 biofilms by injecting non-radioactive caesium chloride (CsCl) and strontium chloride (SrCl 2 ) into microstructures embedded in polydimethylsiloxane microfluidic devices, which were used due to their strong toxicity limitations. Four types of microstructures with two different diameters were used in the study. The change of biofilm thickness from fluid velocity and wall shear stress was estimated using computational fluid dynamics and observed throughout the experiment. The effect of pore space became a significant physical factor when the fluid was flowing through the microfluidic devices. As the pore space increased, the biofilm growth increased; therefore, triangular microstructures with the largest pore space showed the best growth of biofilm. Caesium chloride (CsCl) and strontium chloride (SrCl 2 ), less toxic than radioactive caesium (Cs) and strontium (Sr), completely eradicated the P. aeruginosa PAO1 biofilm with low concentrations. The combined effect of toxicity, fluid velocity, wall shear stress and microstructures increased the efficiency of biofilm eradication. These findings on microfluidic chips can help to indirectly predict the impact on human public health and ecosystems without using radioactive chemicals.

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

Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería ◽

10.23967/j.rimni.2021.04.001 ◽

2021 ◽

Vol 37 (1) ◽

Author(s):

H. Zhang ◽

J. Zhang ◽

L. Lv

Keyword(s):

High Pressure ◽

Shear Stress ◽

Wall Shear Stress ◽

Wear Mechanism ◽

Erosion Rate ◽

Fluid Velocity ◽

Erosion Wear ◽

Two Phase ◽

Geometry Model ◽

Wall Shear

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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