Open AccessMixed convection heat transfer in multi-Lid- driven trapezoidal annulus filled with hybrid nanofluid
Author(s) -
Israa Alesbe,
Sahira Hasan Ibrahim,
Sattar Aljabair
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1973/1/012065
Subject(s) - nanofluid , heat transfer , mechanics , materials science , annulus (botany) , pressure drop , combined forced and natural convection , thermodynamics , cylinder , convective heat transfer , heat transfer coefficient , heat transfer enhancement , natural convection , composite material , physics , geometry , mathematics
Numerical study of mixed convection heat transfer in multi-Lid driven concentric trapezoidal annulus filled with H 2 O-Cu-Al 2 O 3 hybrid nanofluid has been investigated. Three cases for multi-Lid driven have been studied: single lid-driven, double lid-driven move in the same direction, double lid-driven move in the opposite direction. The lid-driven walls move with a constant speed with constant cold temperature T C and the other inclined walls are insulated while the inner trapezoidal cylinder heated at constant temperature T h . Finite volume method used to solve the continuity, momentum, and energy equations by SIMPLE algorithm. The results validated by comparing with previous study with a good agreement of accuracy. The working fluids was: water with hybrid nanoparticles (volume fraction ϕ = 0 to 10%). The Richardson numbers changed from 0.01 to 10, to cover all convection heat transfer modes, and aspect ratios were 0.5 and 1. The results show that, the opposing flow produced highest maximum stream function. Moreover, in aiding flow (case 2) produced a heat transfer coefficient on the top and bottom walls of outer cylinder higher than that produced by the opposing flow (case 3). Generally, the skin friction increases with increase in the volume fraction of nanoparticles due to increasing the viscosity of fluid causes increase in shear stress and leads to increasing the pressure drop. Additionally, the aiding flow produced fiction factor higher than the opposing flow.