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Two-phase simulation of a shell and tube heat exchanger filled with hybrid nanofluid

ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS 2023年 146卷 80-88页

作者： Alqarni, M. M. Ibrahim, Muhammaad Assiri, Taghreed A. Saeed, Tareq Mousa, Abd Allah A. Ali, Vakkar King Khalid Univ Coll Sci Dept Math Abha 61413 Saudi Arabia CECOS Univ IT & Emerging Sci Dept Basic Sci & Humanities Peshawar Pakistan Umm Al Qura Univ Fac Sci Dept Math Mecca Saudi Arabia King Abdulaziz Univ Fac Sci Dept Math Nonlinear Anal & Appl Math NAAM Res Grp POB 80203 Jeddah 21589 Saudi Arabia Taif Univ Coll Sci Dept Math & Stat POB 11099 Taif 21944 Saudi Arabia Majmaah Univ Coll Engn Dept Mech & Ind Engn Al Majmaah 11952 Saudi Arabia

The major purpose of the present research study is to design an efficient heat exchanger filled with hybrid nanofluid numerically by making use Al2O3-Cu-water hybrid nanofluid, FVM and simplec algorithm. The in-fluences of utilizing ribbed tube and then applying nanofluid are probed. Based on obtained findings usage of inner grooves for tube has an obvious effect on the rise of heat exchanger. The inner grooved heat exchanger with N = 3, P = 12mm, a = 0.9mm and q = 50 degrees is introduced as the most efficient inner grooved model filled with nanofluid. Further, it is shown that utilizing nanofluid improves the heat exchanger's energy efficiency. Also one of the important goals of this paper was to choose the optimum grid-mesh (GM) along with the least calculation time as well as the highest accuracy. Due to fulfill this demand, four diverse grid-meshes models were developed. For each of the models, various grids were developed and then checked for the analysis of error percent as well as estimation of the time values. The GM-Four with 930289 nodes is considered to ensure a good agreement in the 137 min. The model with Re=2,000,000 and phi Cu = 0.10 & phi Al2O3 = 0.05 at has the most efficiency among all models.

关键词： Hybrid nanofluid Heat exchanger Grooved tube Two-phase model simplec algorithm Inner grooved

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Numerical Simulation and Experimental Verification of Flow Field of Multiple Swirling Nozzle

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JOURNAL OF APPLIED SCIENCE AND ENGINEERING 2019年第1期22卷 135-144页

作者： Lei, Li Dai, Xiaodong China Univ Petr Shengli Coll Coll Petr Engn Dongying Peoples R China China Univ Petr East China Natl Univ Sci Pk Postdoctoral Working Stn Dongying Peoples R China

Depending on the jet nozzle which can break rock efficiently in the coal-bed methane formation, the radial horizontal well technology can form several horizontal holes with a certain diameter and length, andit can increase the exposed area and improve the production of single coal-bed methane well. In order to solve the problem that the jet nozzle can't achieve the goal of horizontal holes with large diameter and deep depth simultaneously, the multiple swirling jet nozzle with simple structure was designed. The outflow field of nozzle simulated by simplec algorithm showed the influence of water hole arrangement on flow field. The influence law of radius of setting circle, tangential angle and inclined angle on the rock breaking effect were studied by single factor indoor experiments, and reasonable parameter combination was optimized by comprehensive rock breaking test. Preferable CBM field application effect had been achieved in Qinshui Basin of Shanxi and this also could illustrate the value of multiple swirling jet nozzle.

关键词： Radial Horizontal Well Swirling Jet simplec algorithm Laboratory Rock-breaking Experiment Field Application

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Numerical Simulation and Experimental Verification of Flow Field of Multiple Swirling Nozzle

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淡江理工学刊 2019年第1期22卷 135-144页

作者： Li Lei Xiaodong Dai

关键词： Radial Horizontal Well Swirling Jet simplec algorithm Laboratory Rock-breaking Experiment Field Application

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Numerical modeling of gas-liquid flows in mini- and microchannels

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THERMOPHYSICS AND AEROMECHANICS 2015年第1期22卷 61-71页

作者： Guzei, D. V. Minakov, A. V. Pryazhnikov, M. I. Dekterev, A. A. Siberian Fed Univ Krasnoyarsk Russia Kutateladze Inst Thermophys SB RAS Novosibirsk Russia

The paper presents the results of testing a methodology for calculating two-phase flows in mini- and microchannels. The numerical methodology is based on the known fluid-in-cell method (VOF method) and the CSF procedure to account for surface tension forces. Solutions of several test problems of two-phase flow in microchannels, including the water-oil emulsion flow and gas-liquid flow in microchannels of the T-type and the stationary slug flow in a circular minichannel, were considered with the aid of this technique. Comparisons of numerical results with experimental data were carried out. A good agreement between the results was obtained.

关键词： two-phase flows microchannels VOF method simplec algorithm control volume method

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Depth-averaged modeling of free surface flows in open channels with emerged and submerged vegetation

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APPLIED MATHEMATICAL MODELLING 2013年第1-2期37卷 540-553页

作者： Zhang, Mingliang Li, C. W. Shen, Yongming Dalian Ocean Univ Sch Ocean & Environm Engn Dalian Peoples R China Hong Kong Polytech Univ Dept Civil & Struct Engn Kowloon Hong Kong Peoples R China Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian Peoples R China

The resistance induced by vegetation on the flow in a watercourse should be considered in projects of watercourse management and river restoration. Depth-averaged numerical model is an efficient tool to study this problem. In this study, a depth-averaged model using the finite volume method on a staggered curvilinear grid and the simplec algorithm for numerical solution is developed for simulating the hydrodynamics of free surface flows in watercourses with vegetation. For the model formulation the vegetation resistance is treated as a momentum sink and represented by a Manning type equation, and turbulence is parameterized by the k-epsilon equations. An analytical equation is derived to represent the resistance induced by submerged vegetation by an equivalent Manning roughness coefficient. Numerical simulation is carried out for the flow in an open channel with a 180 degrees bend, and the flow in a curved open channel partly covered by emerged vegetation, as well as the flow in a straight trapezoidal channel with submerged vegetation. The agreement between the computed results and the measured data is generally good, showing that the resistance due to emerged or submerged vegetation can be represented accurately by the Manning roughness equation. The computed results demonstrate that the depth-averaged modeling is a reasonable and efficient tool to study flows in watercourses with vegetations. (c) 2012 Elsevier Inc. All rights reserved.

关键词： Depth-averaged modeling Emerged and submerged vegetation Manning equation k-epsilon Turbulent model simplec algorithm

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Single-phase Computational Fluid Dynamics Applicability for the Study of Three-dimensional Flow in 5×5 Rod Bundles with Spacer Grids

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Chinese Journal of Mechanical Engineering 2012年第4期25卷 738-744页

作者： TIAN Ruifeng MAO Xiaohui GAO Puzhen HUANG Yanping College of Nuclear Science and Technology Harbin Engineering University Harbin 150001 China National Defense Key Discipline Laboratory of Nuclear Safety and Simulation Technology Harbin Engineering University Harbin 150001 China National Key Laboratory of Bubble Physics and Nature Circulation Nuclear Power Institute of China Chengdu 610041 China

Spacer grids play an important role in pressurized water reactor（PWR） fuel assembly in that they have significant influence on the thermal-hydraulic characteristics of the reactor *** so far,the numerical studies are performed without regarding dimple and spring of spacer grids,just considering mixing ***,these studies use k-ε turbulence model without considering the suitability of the other turbulence models upon the different spacer grids flow.A study is carried out to understand the 3-D single-phase flow in AFA-2G 5×5 rod bundles with spacer grids based on numerical *** order to investigate the suitability of different turbulence models,k-ε model and k-ω model,the influence of different parts of spacer grid on the fluid flow is also *** using second-order upwind scheme,hybrid grids technique,and improved simplec algorithm,the Reynolds averaged mass conservation and momentum conservation equations are solved,and the pressure and velocity field of flow are *** numerical simulation results are compared with experiment results and the agreement is *** simulation results show the influences of the spring,dimple and mixing vane,and the different characteristics of the k-ε model and k-ω *** with the experiment results,the simulation results suggest that the k-ω model is suitable for the simulation of the rod bundle flow with spacer grids;the spring and dimple are the main causes of the pressure loss in the spacer grid *** friction coefficient of the channel with spring and dimple is 1.5 times the coefficient of the channel with the *** results are beneficial to enhance the simulation ability of spacer grids flow and optimization design ability of spaces grid.

关键词： rod bundles spacer grids turbulence model simplec algorithm

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Numerical simulation of salinity and pollutant transport in estuary by using a depth averaged 2D model

Numerical simulation of salinity and pollutant transport in ...

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International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE 2012)

作者： Zhang, Mingliang Zhao, Tingyao Xia, Hainan Dalian Univ Technol Sch Ocean Sci Technol & Environm Dalian 116023 Liaoning Peoples R China

ISBN: (纸本)9783037854853

An implicit finite volume scheme is developed to solve the depth-averaged 2-D shallow water flow equations. The computational mesh consists of rectangular cells, with quadtree technology incorporated to locally refine the mesh around structures of interest or where the topography and/or flow properties change sharply. The governing equations are solved using the simplec algorithm on non-staggered grid to handle the coupling of water level and velocity. The discretized algebraic equations are solved iteratively using the GMRES method. The model has been tested against measurement data for steady flow at T Junction channel, unsteady flow in idealized estuary, tidal flows and pollutant transport in Gironde Estuary. The model reasonably well reproduces the temporal and spatial variations of water level and current speed observed in the measurements.

关键词： Implicit model simplec algorithm Pollutant Transport Sudden release

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Implementation of a smoothing pressure correction approach to the pressure-correction equation in order to maintain the use of simplec algorithms on non-staggered grids

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PROGRESS IN COMPUTATIONAL FLUID DYNAMICS 2010年第1期10卷 40-50页

作者： Anany, M. N. Schnell, U. Scheffknecht, G. Univ Stuttgart Inst Proc Engn & Power Plant Technol D-70569 Stuttgart Germany

Date (1996) introduced a pressure-correction equation containing mass-conserving and smoothing pressure correction terms to solve the Navier-Stokes equations. The benefit of the smoothing terms is satisfying the stokes's relation which is often overlooked as well as overcoming the decoupling problem of the pressure-velocity fields, which renders it applicable to collocated (non-staggered) grids. His derivation relied on assumptions relevant to the SIMPLE algorithm (Caretto et al., 1972). Such assumptions are, unfortunately, not directly applicable to simplec procedures (van Doormaal and Raithby, 1984). The main purpose of this paper is to extend the pressure-correction equation proposed by Date (1996) to simplec algorithms.

关键词： colocated grid collocated grid non-staggered grid SIMPLE algorithm simplec algorithm smoothing pressure corrections

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A 3D non-linear k-ε turbulent model for prediction of flow and mass transport in channel with vegetation

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APPLIED MATHEMATICAL MODELLING 2010年第4期34卷 1021-1031页

作者： Zhang, Ming-Liang Li, C. W. Shen, Yong-Ming Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian Peoples R China Hong Kong Polytech Univ Dept Civil & Struct Engn Hong Kong Hong Kong Peoples R China

The results from a 3D non-linear k-epsilon turbulence model with vegetation are presented to investigate the flow structure, the velocity distribution and mass transport process in a straight compound open channel and a curved open channel. The 3D numerical model for calculating flow is set up in non-orthogonal curvilinear coordinates in order to calculate the complex boundary channel. The finite volume method is used to disperse the governing equations and the simplec algorithm is applied to acquire the coupling of velocity and pressure. The non-linear k-epsilon turbulent model has good useful value because of taking into account the anisotropy and not increasing the computational time. The water level of this model is determined from 2D Poisson equation derived from 2D depth-averaged momentum equations. For concentration simulation, an expression for dispersion through vegetation is derived in the present work for the mixing due to flow over vegetation. The simulated results are in good agreement with available experimental data, which indicates that the developed 3D model can predict the flow structure and mass transport in the open channel with vegetation. (C) 2009 Elsevier Inc. All rights reserved.

关键词： Non-linear k-epsilon turbulence model simplec algorithm 2D Poisson equation Vegetation Drag force Mass transport

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Extended two-fluid model applied to analysis of bubbly flow in multiphase rotodynamic pump impeller

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中国高等学校学术文摘·机械工程 2009年第1期4卷 53-59页

作者： Zhiyi YU Guoyu WANG Shuliang CAO School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing 100081 China Department of Thermal Engineering Tsinghua University Beijing 100084 China

This paper presents an extended two-fluid model based on the Navier-Stokes equations and the standard k-e turbulence model, to simulate the three-dimensional air-water bubbly flow in turbo machinery. In the governing equations, the drag force and added mass force are added and the additional source terms arising from fluctuations of gas volume fraction are considered. The discrete equations are solved using a developed two-phase semi-implicit method for pressure-linked equations, consistent (simplec) algorithm in body-fitted coordi-nates with a staggered grid system. Simulation is then carried out for the pure liquid flow and air-water two-phase flow with the inlet gas volume fraction being 15% in a multiphase rotodynamic pump impeller and the pump head performance is predicted. Comparison with experimental results shows the reliability and commonality of the numerical model.

关键词： two-fluid model multiphase rotodynamicpump simplec algorithm numerical simulation

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