EFFECTS OF VARIABLE TEMPERATURE ON MIXED CONVECTION OF A CU-WATER NANOFLUID IN A DOUBLE-LID-DRIVEN POROUS ENCLOSURE WITH ACTIVE MIDDLE VERTICAL WALL

The present work is dedicated to the three-dimensional numerical study of mixed convection heat transfer, taking place within a ventilated cavity (of shape L) crossed by Cu-water nanofluid. The enclosure is subjected to the action of a magnetic field. The ventilation is assured by two openings of the same size. The cold flow enters by an opening practiced at the top of the left wall, and exits by another opening practiced at the bottom of the right vertical wall. All the cavity walls are maintained at the same temperature, superior to that of the entering flow, except the side walls which are considered as adiabatic. The control parameters are: the Reynolds number and the Hartmann number as well as the nanoparticles volume fraction.

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A parallel finite element study of 3D mixed convection in a fluid saturated cubic porous enclosure under injection/suction effect

Applied Mathematics and Computation ◽

10.1016/j.amc.2015.07.028 ◽

2015 ◽

Vol 269 ◽

pp. 841-862 ◽

Cited By ~ 1

Author(s):

S.V.S.S.N.V.G. Krishna Murthy ◽

B.V. Rathish Kumar ◽

Mohit Nigam

Keyword(s):

Finite Element ◽

Mixed Convection ◽

Finite Element Study ◽

Parallel Finite Element ◽

Porous Enclosure ◽

Element Study

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Numerical Study on Mixed Convection in Porous Media in a Channel With an Open Cavity Below

Volume 7: Fluid Flow, Heat Transfer and Thermal Systems, Parts A and B ◽

10.1115/imece2010-40574 ◽

2010 ◽

Author(s):

Bernardo Buonomo ◽

Oronzio Manca ◽

Paolo Mesolella ◽

Sergio Nardini

Keyword(s):

Mixed Convection ◽

Numerical Study ◽

Fluid Dynamic ◽

Vertical Wall ◽

Open Cavity ◽

Temperature Fields ◽

Forced Flow ◽

Heated Wall ◽

Local Thermal Equilibrium ◽

Uniform Heat Flux

A numerical analysis of mixed convection in gas saturated metal foam in a horizontal channel with an open cavity heated at uniform heat flux on a vertical wall is studied numerically. Non-local thermal equilibrium and Brinkman-Forchheimer-extended Darcy model are assumed. Boussinesq approximation with constant thermophysical proprieties are considered. Results are carried out for an aluminium foam with 10 PPI and ε = 0.909, the fluid is air and for the assisting case. Results, for different Peclet and Rayleigh numbers, are given in terms of solid and fluid wall temperatures and local Nusselt numbers and stream function and temperature fields. Results show that diffusive effect determined lower temperature values inside the solid and the fluid temperatures are higher in all considered cases. The interaction between the forced flow in the channel and the buoyancy due to the heated wall determines different thermal and fluid dynamic behaviors.

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Effects of heat sink and source and entropy generation on MHD mixed convection of a Cu-water nanofluid in a lid-driven square porous enclosure with partial slip

Physics of Fluids ◽

10.1063/1.4981911 ◽

2017 ◽

Vol 29 (5) ◽

pp. 052001 ◽

Cited By ~ 77

Author(s):

A. J. Chamkha ◽

A. M. Rashad ◽

M. A. Mansour ◽

T. Armaghani ◽

M. Ghalambaz

Keyword(s):

Mixed Convection ◽

Entropy Generation ◽

Heat Sink ◽

Partial Slip ◽

Porous Enclosure

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Numerical simulation of MHD mixed convection in a nanofluid filled non-darcy porous enclosure

International Journal of Mechanical Sciences ◽

10.1016/j.ijmecsci.2017.06.008 ◽

2017 ◽

Vol 130 ◽

pp. 154-166 ◽

Cited By ~ 14

Author(s):

A. Shamadhani Begum ◽

N. Nithyadevi ◽

Hakan F. Öztop ◽

Khaled Al-Salem

Keyword(s):

Numerical Simulation ◽

Mixed Convection ◽

Porous Enclosure

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Upward and downward conjugate mixed convection heat transfer in a partially porous cavity

International Journal of Numerical Methods for Heat &amp Fluid Flow ◽

10.1108/hff-01-2015-0037 ◽

2016 ◽

Vol 26 (1) ◽

pp. 159-188 ◽

Cited By ~ 3

Author(s):

Abderrahim Bourouis ◽

Abdeslam Omara ◽

Said Abboudi

Keyword(s):

Heat Transfer ◽

Thermal Conductivity ◽

Mixed Convection ◽

Transfer Rate ◽

Vertical Wall ◽

Thermal Conductivity Ratio ◽

Conductivity Ratio ◽

Content Type ◽

Moving Wall ◽

The Right

Purpose – The purpose of this paper is to provide a numerical study of conjugate heat transfer by mixed convection and conduction in a lid-driven enclosure with thick vertical porous layer. The effect of the relevant parameters: Richardson number (Ri=0.1, 1, 10) and thermal conductivity ratio (Rk=0.1, 1, 10, 100) are investigated. Design/methodology/approach – The studied system is a two dimensional lid-driven enclosure with thick vertical porous layer. The left vertical wall of the enclosure is allowed to move in its own plane at a constant velocity. The enclosure is heated from the right vertical wall isothermally. The left and the right vertical walls are isothermal but temperature of the outside of the right vertical wall is higher than that of the left vertical wall. Horizontal walls are insulated. The governing equations are solved by finite volume method and the SIMPLE algorithm. Findings – From the finding results, it is observed that: for the two studied cases, heat transfer rate along the hot wall is a decreasing function of thermal conductivity ratio irrespective of Richardson numbers contrary to the heat transfer rate along the fluid-porous layer interface which is an increasing function of thermal conductivity ratio. At forced convection dominant regime, the difference between heat transfer rate for upward and downward moving wall is insensitive to the thermal conductivity ratio. For downward moving wall, average Nusselt number is higher than that of upward moving wall. Practical implications – Some applications: building applications, furnace design, nuclear reactors, air solar collectors. Originality/value – From the bibliographic work and the authors’ knowledge, the conjugate mixed convection in lid-driven partially porous enclosures has not yet been investigated which motivates the present work that represent a continuation of the preceding investigations.

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Mixed convection flow of Jeffrey fluid along an inclined stretching cylinder with double stratification effect

Thermal Science ◽

10.2298/tsci141106052h ◽

2017 ◽

Vol 21 (2) ◽

pp. 849-862 ◽

Cited By ~ 16

Author(s):

Tasawar Hayat ◽

Sajid Qayyum ◽

Muhammad Farooq ◽

Ahmad Alsaedi ◽

Muhammad Ayub

Keyword(s):

Differential Equations ◽

Mixed Convection ◽

Variable Temperature ◽

Heat Transfer Analysis ◽

Convection Flow ◽

Jeffrey Fluid ◽

Convection Boundary Layer ◽

Stretching Cylinder ◽

Double Stratification ◽

Non Linear

This paper addresses double stratified mixed convection boundary layer flow of Jeffrey fluid due to an impermeable inclined stretching cylinder. Heat transfer analysis is carried out with heat generation/absorption. Variable temperature and concentration are assumed at the surface of cylinder and ambient fluid. Non-linear partial differential equations are reduced into the non-linear ordinary differential equations after using the suitable transformations. Convergent series solutions are computed. Effects of various pertinent parameters on the velocity, temperature, and concentration distributions are analyzed graphically. Numerical values of skin friction coefficient, Nusselt, and Sherwood numbers are also computed and discussed.

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