Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary Condition

A two-dimensional steady laminar natural convection in rectangular enclosure filled with CuO-water nanofluid is numerically investigated. The horizontal walls are thermally insulated and the left vertical side one is heated by a temporal sinusoidal temperature variation, whereas the right wall is ke...

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Main Authors: M. Bouhalleb, Hassen abbassi
Format: Article
Language:English
Published: Isfahan University of Technology 2016-01-01
Series:Journal of Applied Fluid Mechanics
Subjects:
Online Access:http://jafmonline.net/JournalArchive/download?file_ID=39811&issue_ID=228
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spelling doaj-6634e7915a3a414eb631b1d9b75acbc62020-11-24T21:31:46ZengIsfahan University of Technology Journal of Applied Fluid Mechanics1735-35722016-01-019311571166.Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary ConditionM. Bouhalleb0Hassen abbassi1faculty of sciences sfaxfaculty of sciences sfaxA two-dimensional steady laminar natural convection in rectangular enclosure filled with CuO-water nanofluid is numerically investigated. The horizontal walls are thermally insulated and the left vertical side one is heated by a temporal sinusoidal temperature variation, whereas the right wall is kept at cold temperature. Mass Conservation, momentum, and energy equations are numerically solved by the finite volume element method using the SIMPLER algorithm for pressure-velocity coupling. This study has been carried out for four parameters: the volumetric fraction of nanoparticles  (0%≤≤4%), aspect ratio Ar (0.25≤Ar≤1), amplitude of temperature a (0.2≤a≤0.8) and its period (0.2≤Θ≤0.8). These simulations are performed at constant Rayleigh and Prandtl numbers (Ra=105and Pr=7.02). Numerical results show that the addition of nanoparticules into the basic fluid has a double role, increasing heat transfer and reducing the response time of the system. The decreasing of aspect ratio shows an increasing trend of the heat transfer and increases the amplitude of Nusselt number. We also see that after a time period the system does not return to its initial state (hysteresis phenomenon) because of the system inertia.http://jafmonline.net/JournalArchive/download?file_ID=39811&issue_ID=228Nanofluid; Nanoparticules; Time response; Aspect ratio; Period.
collection DOAJ
language English
format Article
sources DOAJ
author M. Bouhalleb
Hassen abbassi
spellingShingle M. Bouhalleb
Hassen abbassi
Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary Condition
Journal of Applied Fluid Mechanics
Nanofluid; Nanoparticules; Time response; Aspect ratio; Period.
author_facet M. Bouhalleb
Hassen abbassi
author_sort M. Bouhalleb
title Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary Condition
title_short Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary Condition
title_full Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary Condition
title_fullStr Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary Condition
title_full_unstemmed Time Response of Natural Convection of Nanofluid CuO-H2O in Enclosure Submitted to a Sinusoidal Thermal Boundary Condition
title_sort time response of natural convection of nanofluid cuo-h2o in enclosure submitted to a sinusoidal thermal boundary condition
publisher Isfahan University of Technology
series Journal of Applied Fluid Mechanics
issn 1735-3572
publishDate 2016-01-01
description A two-dimensional steady laminar natural convection in rectangular enclosure filled with CuO-water nanofluid is numerically investigated. The horizontal walls are thermally insulated and the left vertical side one is heated by a temporal sinusoidal temperature variation, whereas the right wall is kept at cold temperature. Mass Conservation, momentum, and energy equations are numerically solved by the finite volume element method using the SIMPLER algorithm for pressure-velocity coupling. This study has been carried out for four parameters: the volumetric fraction of nanoparticles  (0%≤≤4%), aspect ratio Ar (0.25≤Ar≤1), amplitude of temperature a (0.2≤a≤0.8) and its period (0.2≤Θ≤0.8). These simulations are performed at constant Rayleigh and Prandtl numbers (Ra=105and Pr=7.02). Numerical results show that the addition of nanoparticules into the basic fluid has a double role, increasing heat transfer and reducing the response time of the system. The decreasing of aspect ratio shows an increasing trend of the heat transfer and increases the amplitude of Nusselt number. We also see that after a time period the system does not return to its initial state (hysteresis phenomenon) because of the system inertia.
topic Nanofluid; Nanoparticules; Time response; Aspect ratio; Period.
url http://jafmonline.net/JournalArchive/download?file_ID=39811&issue_ID=228
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AT hassenabbassi timeresponseofnaturalconvectionofnanofluidcuoh2oinenclosuresubmittedtoasinusoidalthermalboundarycondition
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