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Three-dimensional analysis of natural convection in nanofluid-filled parallelogrammic enclosure opened from top and heated with square heater

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Journal of Central South University 2019年第5期26卷 1077-1088页

作者： Abdullah A.A.A AL-RASHED Walid HASSEN Lioua KOLSI Hakan F. OZTOP Ali J. CHAMKHA Nidal ABU-HAMDEH Department of Automotive and Marine Engineering Technology College of Technological Studiesthe Public Authority for Applied Education and TrainingKuwait Unité de Métrologie et des Systèmes énergétiques école Nationale d’IngénieursMonastirUniversity of MonastirTunisia College of Engineering Mechanical Engineering DepartmentHail UniversityHail CitySaudi Arabia dept.mech.Engineering Technology FacultyFirat UniversityTR-23119ElazigTurkey Department of mech.nical Engineering King Abdulaziz UniversityJeddahSaudi Arabia mech.nical Engineering Department Prince Sultan Endowment for Energy and EnvironmentPrince Mohammad Bin Fahd UniversityAl-Khobar 31952Saudi Arabia RAK Research and Innovation Center American University of Ras Al KhaimahP.O.Box 10021Ras Al KhaimahUnited Arab Emirates

A numerical study based on the finite volume method has been performed to study the three-dimension natural convection in a parallelogrammic top side opened cavity filled nanofluid with partially heated square at the bottom *** are obtained for different governing parameters such as nanoparticle concentration (φ) from 0 to 0.05,inclination angle of the back and front walls (α) from 5° to 75°,Rayleigh number from 10^3 to 10^5,and length of heater changer from 0.1 to *** main finding from the obtained result showed that the inclination angle and nanoparticle volume fraction affect the flow structure and enhance the heat transfer.

关键词： 3D analysis open enclosure partial heating parallelogram nanofluids

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A lumped parameter vane pump model for system stability analysis

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International Journal of Hydromech.tronics 2018年第3期1卷 1-1页

作者： Ryan P.Jenkins Monika Ivantysynova Purdue Univ Sch Mech Engn Maha Fluid Power Res Ctr 225 South Univ St W Lafayette IN 47905 USA Purdue Univ Dept Agr & Biol Engn Maha Fluid Power Res Ctr 225 South Univ St W Lafayette IN 47905 USA

This paper presents a semi-empirical lumped parameter model developed for analysing the dynamic stability and performance limitations of a pressure compensated vane pump for an automotive application with low-cost *** model calculates continuous displacement chamber pressure profiles and inertial effects for the determination of the internal forces acting on the vane pump's pivoting *** conducted on a custom test stand were used to define a nonlinearly progressive bias spring model and a black box representation of the pump control system *** of the complete model reveals that the performance limitations imposed by the control system valves,in terms of system stability and achievable controller bandwidth,are more restrictive than the limitations imposed by the low-cost vane pump and limit the that bandwidth to 1.84 *** control system also imposes limitations to the system performance based on resonance phenomena which may be significant in some applications.

关键词： presents semi-empirical lumped parameter chamber

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