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Pressure of newtonian fluid Flow through Curved Pipes and Elbows

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Journal of Thermal Science 2013年第4期22卷 372-376页

作者： Hao Zhang Xinxin Zhang Haosen Sun Mingjiu Chen Xiaoyang Lu Yuancheng Wang Xueting Liu Key Laboratory of Renewable Energy Utilization Technologies in Buildings Ministry of Education Shandong Key Laboratory of Renewable Energy Utilization Technologies in Buildings Shandong Jianzhu University School of Thermal Energy Engineering Shandong Jianzhu University Department of Thermal Engineering University of Science and Technology Beijing Shandong Jianzhu University Archives Institute of Engineering Mechanics Shandong Jianzhu University

Under conditions of high temperature and high pressure, the non-uniformity of pressure loads has intensified the stress concentration which impacts the safety of curved pipes and elbows. This paper focuses on the pressure distribution and flow characteristic in a curved 90° bend pipe with circular cross-sections, which are widely used in industrial applications. These flow and pressure characteristics in curved bend pipes have been researched by employing numerical simulation and theoretical analysis. Based on the dimensionless analysis method a formula for the pressure of newtonian fluid flow through the elbow pipes is deduced. Also the pressure distributions of several elbows with different curvature ratio R/D are obtained by numerical methods. The influence of these non-dimensional parameters such as non-dimensional curvature ratio, Reynolds number and non-dimensional axial angle a and circumferential angle fl on the pressure distribution in elbow pipes is discussed in detail. A number of important results have been achieved. This paper provides theoretical and numerical methods to understand the mechanical property of fluid flow in elbow pipes, to analyze the stress and to design the wall thickness of elbow pipes.

关键词： newtonian fluid Dimensional analysis Pressure formula Numerical study

Insight into the relationship between non-linear mixed convection and thermal radiation:The case of newtonian fluid flow due to non-linear stretching

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Propulsion and Power Research 2023年第1期12卷 153-165页

作者： Amit Kumar Pandey Krishnendu Bhattacharyya Anil Kumar Gautam Sohita Rajput Mani Shankar Mandal Ali J.Chamkha Dhananjay Yadav Department of Mathematics Institute of ScienceBanaras Hindu UniversityVaranasi-221005Uttar PradeshIndia Department of Mathematics Government General Degree CollegeKalnaeIBurdwan-713405West BengalIndia Faculty of Engineering Kuwait College of Science and TechnologyDoha DistrictKuwait Department of Mathematical and Physical Sciences University of NizwaOman

The current research focuses the light on the characterization of buoyancy-driven non-linear mixed convection and non-linear radiation in a newtonian flow over a nonlinearly stretching vertical sheet,and this type of flow has useful applications in many industrial processes,such as the paper and pulp industry,polymer industry,electronic device cooling,solar collectors,gas turbine plants,and nuclear *** appropriate transformations,governing PDEs for non-linear mixed convection are reduced to higher-order non-linear ODEs and those are numerically *** with tabular presentations of computed results,the graphical representations are generated to elucidate the effects of involved parameters on convection transport properties and their *** demonstrates that flow velocity increases near the surface and decreases away from the surface as the non-linear convection parameter ***,increments in the thermal buoyancy,temperature ratio and non-linear radiation parameters result in the boost of *** temperature decreases as linear and non-linear buoyancy-related parameters(non-linear convection and thermal buoyancy parameters)are of higher *** contrast,the temperature rises with two non-linear thermal radiation-related parameters(thermal ratio and non-linear radiation parameters).For greater values of the non-linear stretching related parameter,a lower velocity and a higher temperature are *** non-linear convection,thermal buoyancy,thermal ratio and non-linear radiation parameters contribute toward the reduction of the magnitude of surface-drag force and growth of the surface cooling ***,with the non-linearity in surface stretching there are significant percentage hikes of surface-drag force magnitude and surface cooling rate.

关键词： Non-linear mixed convection Non-linear thermal radiation Non-linear stretching sheet newtonian fluid

Modeling the Unsteady Flow of a newtonian fluid Originating from the Hole of an Open Cylindrical Reservoir

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fluid Dynamics & Materials Processing 2022年第6期18卷 1737-1748页

作者： Andrianantenaina Marcelin Hajamalala Ratovonarivo Noarijaona Zeghmati Belkacem Laboratory of Mechanics Energetic and Environment(LMEE) University of FianarantsoaFianarantsoaB.P.1264Madagascar Laboratory of Mathematics and Physics(LA.M.P.S) University of Perpignan Via DomitiaPerpignan66860France

This work deals with the modeling of the unsteady newtonian fluid flow associated with an open cylindrical *** reservoir presents a hole on the right bottom *** volume variation,heat and mass transfers are *** unsteady governing equations are based on the conservation of mass and momentum.A finite volume technique is used to solve the non-dimensional equations and related boundary *** algebraic system of equations resulting from the discretization process are solved by means of the THOMAS *** pressure-velocity coupling,the SIMPLE algorithm(Semi Implicit Method for Pressure Linked Equations)is *** for laminar flow(Refluid flow are *** is shown that the velocities and pressure depend essentially on the reservoir *** validate the model,the present results have been compared with Zhou et al.’s results,Poiseuille’s and Bernoulli’s exact solution.

关键词： Modeling newtonian fluid cylindrical reservoir navier-stokes

THE NUMERICAL SIMULATION OF TURBULENT FLOWS OF newtonian AND A SORT OF NON-newtonian fluid IN 180-DEGREE SQUARE SECTIONED BEND

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Applied Mathematics and Mechanics(English Edition) 1991年第1期12卷 1-11页

作者：冯桐钱伟长孙厚钧 Shanghai Institute of Applied Mathematics and Mechanics Shanghai University of Technology Shanghai

Using k- model of turbulence and measured wall functions, turbulent flows of newtonian (pure water) andasort of non-newtonian fluid (dilute, drag-reduction solution of polymer) in a 180-degree curved bend were simulated numerically. The calculated results agreed well with the measured velocity profiles. On the basis of calculation and measurement, appropriateness of turbulence model to complicated flow in which the large-scale vortex exists was analyzed and discussed.

关键词： newtonian fluid non-newtonian fluid turbulent flows numerical simulation

STUDY ON FINITE ELEMENT METHODS OF THE EXTRUDATE SWELL PROBLEM(Ⅰ)newtonian fluid

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Journal of Hydrodynamics 1989年第4期1卷 46-58页

作者： Fan Yu-ren Fan Xi-jun Lu Yong-xiang Zhejiang University,Hangzhou,P.R.China

The problem of a creeping flow of newtonian fluid extruded from a plane slit or a circular *** the absence of gravity,is simulated successfully by using the continuous-pressure-element method,the discontinuous-pressure-element method,the consistant penalty method,the reduced integration penalty method and the modified reduced integration penalty method proposed by *** comparisons between these methods,it is convinced that the discontinuous-pressure interpolation schemes result in more accurate mass conservation and,consequently,more rapid convergence of the free-surface iteration than the continuous one *** reduced integration penalty method can further reduce the cost of computation while retaining sufficient accuracy of the solution.

关键词： newtonian fluid STUDY ON FINITE ELEMENT METHODS OF THE EXTRUDATE SWELL PROBLEM

Remarks on Exponential Stability of Solutions for the Compressible p-th Power newtonian fluid with Large Initial Data

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Journal of Partial Differential Equations 2016年第4期29卷 286-301页

作者： ZHANG Jianlin QIN Yuming CAO Jie College of Information Science and Technology Donghua University Shanghai201620 China Department of Applied Mathematics College of Science Zhongyuan University of Technology Zhengzhou 450007 China Department of Applied Mathematics Donghua University Shanghai 201620 China

In this paper, we establish the exponential stability of the global spherically and cylindrically symmetric solutions in H1 （i = 1,2,4） for the p-th power newtonian fluid in multi-dimension with large initial data. ... 详细信息

关键词： newtonian fluid global existence asymptotic behavior exponential stability.

Lattice Boltzmann method for three-dimensional moving particles in a newtonian fluid

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Chinese Physics B 2004年第1期13卷 47-53页

作者：方海平 ChenShi-Yi ShanghaiInstituteofNuclearResearch ChineseAcademyofSciencesShanghai201800China DepartmentofMechanicalEngineering theJohnsHopkinsUniversityMD21218USA

A lattice Boltzmann method is developed to simulate three-dimensional solid particle motions in fluids. In the present model, a uniform grid is used and the exact spatial location of the physical boundary of the suspended particles is determined using an interpolation scheme. The numerical accuracy and efficiency of the proposed lattice Boltzmann method is demonstrated by simulating the sedimentation of a single sphere in a square cylinder. Highly accurate simulation results can be achieved with few meshes, compared with the previous lattice Boltzmann methods. The present method is expected to find applications on the flow systems with moving boundaries, such as the blood flow in distensible vessels, the particle-flow interaction and the solidification of alloys.

关键词： lattice Boltzmann method suspension newtonian fluid

Dynamic Analysis of Single Pile in Liquefied Soils Considered as newtonian fluid

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Open Journal of Geology 2021年第2期11卷 19-37页

作者： Jinjing Sun Xinlei Zhang Zhihua Wang Hongmei Gao Lian Xu The 3rd Geological Brigade of Jiangsu Geology & Mineral Exploration Bureau Nanjing China Urban Underground Space Research Center Nanjing Tech University Nanjing China

Case histories have shown that the liquefaction-induced soil lateral spreading is one of the main causes of damage to pile foundations subjected to seismic loading. Post-liquefaction soil behaves similarly to a viscous fluid. This study investigated the effect of soil lateral spreading on a single pile based on fluid mechanics in which the liquefied soils were treated as newtonian fluids. A numerical simulation on a single pile embedded in a fully saturated sandy foundation was conducted and compared with shake table tests. The lateral flow effect and the effect of shear strain rate were discussed. After liquefaction, the acceleration of the foundation shows that there are no obvious spikes and finally reaches a stable state. The presented method can predict the pile response better than p-y curve method. A parametric study was performed to explore the effect of several influence factors on pile behaviors. The results show that the pile head displacement decreases and the maximum bending moment at pile bottom increases with the increase of bending stiffness. With the same pile bending stiffness, the displacement and bending moment of pile increase with the increase of soil viscosity and acceleration amplitude.

关键词： Pile Liquefaction-Induced Lateral Spreading newtonian fluid CFD Method

MHD FLOW OF A newtonian fluid OVER A STRETCHING SHEET: AN APPROXIMATE SOLUTION

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Analysis in Theory and Applications 2000年第3期16卷 32-41页

作者： B.K.Chakraborty H.P.Mazumdar Sodepur Dashbandhn Vidyapith(Boys) 24 Pargenas(N)West BengalIndia Indian Statistical Institute Calcutta-70035India

An approximate solution to the problem of steady laminar flow of a viscous incompressible electrically conducting fluid over a stretching sheet is presented. The approach is based on the idea of stretching the variables of the flow problem and then using least squares method to minimize the residual of a differential equation. The effects of the magnetic field on the flow characteristics are demonstrated through numerical computations with different values of the Hartman number.

关键词： Approximate Solution newtonian fluid Approximate Method Skin Friction Coefficient Indian Statistical Institute