Homogenous–heterogenous reactions in Carreau fluid flow with heat generation/absorption: multiple solution

2019 ◽  
Vol 41 (11) ◽  
Author(s):  
Masood Khan ◽  
Sana Ejaz ◽  
Humara Sardar
Keyword(s):  
Fluid Flow ◽  
Heat Generation ◽  
Multiple Solution ◽  
Carreau Fluid

scholarly journals Carreau fluid flow in a thermally stratified medium with heat generation/absorption effects

2018 ◽  
Vol 12 ◽  
pp. 16-25 ◽  
Author(s):  
Khalil Ur Rehman ◽  
Ali Saleh Alshomrani ◽  
M.Y. Malik
Keyword(s):  
Fluid Flow ◽  
Heat Generation ◽  
Stratified Medium ◽  
Carreau Fluid

Internal heat generation/or absorption phenomena in three-dimensional natural convection flow within enclosure filled with different working fluids

2018 ◽  
Vol 28 (4) ◽  
pp. 878-908
Author(s):  
Najib Hdhiri ◽  
Brahim Ben Beya
Keyword(s):  
Fluid Flow ◽  
Heat Generation ◽  
Average Nusselt Number ◽  
Thermal Field ◽  
Three Dimensional ◽  
Grashof Number ◽  
Content Type ◽  
Wide Range ◽  
Heat Generation Or Absorption ◽  
2D Model

Purpose The purpose of this study is to investigate the effects of heat generation or absorption on heat transfer and fluid flow within two- and three-dimensional enclosure for homogeneous medium filled with different metal liquid. Numerical results are presented and analyzed in terms of fluid flow, thermal field structures, as well as average Nusselt number profiles over a wide range of dimensionless quantities, Grashof number (Gr) (104 and 105), SQ (varied between −500 to 500) and Prandtl number (Pr = 0.015, 0.024 and 0.0321). The results indicate that when the conductive regime is established for a Grashof number Gr = 104, the 2D model is valid and predicts all three-dimensional results with negligible difference. This was not the case in the convective regime (Gr = 105) where the effect of the third direction becomes important, where a 2D-3D difference was seen with about 37 per cent. Also, in most cases, the authors find that the heat absorption phenomena have the opposite effect with respect to the heat generation. Design/methodology/approach Numerical results are presented and analyzed in terms of fluid flow, thermal field structures, as well as average Nusselt number profiles over a wide range of dimensionless quantities. Findings Grashof number (Gr) (104 and 105), SQ (varied between −500 to 500) and Prandtl number (Pr = 0.015, 0.024 and 0.0321). Originality/value The results indicate that when the conductive regime is established for a Grashof number Gr = 104, the 2D model is valid and predicts all three-dimensional results with negligible difference.

scholarly journals Modeling and analysis of biomagnetic blood Carreau fluid flow through a stenosis artery with magnetic heat transfer: A transient study

PLoS ONE ◽  
2018 ◽  
Vol 13 (2) ◽  
pp. e0192138 ◽  
Author(s):  
Mohammad Yaghoub Abdollahzadeh Jamalabadi ◽  
Mohammadreza Daqiqshirazi ◽  
Hossein Nasiri ◽  
Mohammad Reza Safaei ◽  
Truong Khang Nguyen
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Carreau Fluid ◽  
Modeling And Analysis ◽  
Flow Through ◽  
Transient Study

Double-diffusive natural convection in an inclined enclosure with heat generation and Soret effect

2018 ◽  
Vol 35 (8) ◽  
pp. 2753-2774 ◽  
Author(s):  
Safae Hasnaoui ◽  
Abdelkhalek Amahmid ◽  
Abdelghani Raji ◽  
Hassen Beji ◽  
Mohammed Hasnaoui ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Fluid Flow ◽  
Natural Convection ◽  
Finite Difference ◽  
Heat Generation ◽  
Soret Effect ◽  
Internal Heat ◽  
Vertical Position ◽  
Fluid Temperature ◽  
Content Type

PurposeThe purpose of this paper is to study numerically thermosolutal natural convection within an inclined rectangular cavity in the presence of Soret effect and heat generation. The enclosure is heated and salted from its long sides with constant but different temperatures and concentrations. The study focuses on the effects of three main parameters which are, the Soret parameter (Sr = 0 and –0.5), the internal to external Rayleigh numbers ratio 0 ≤ R ≤ 80 and the cavity inclination γ, varied from 0° (vertical position) to 60°. The combined effects of these parameters on fluid flow and heat and mass transfer characteristics are examined for the external Rayleigh numberRaE = 105, the Prandtl numberPr = 0.71, the buoyancy ratioN = 1, the Lewis numberLe = 2 and the aspect ratio of the cavityA = 2.Design/methodology/approachA hybrid lattice Boltzmann-finite difference method (LBM-FD) was used to tackle the problem under consideration. The LBM with the simple relaxation time was used for the fluid flow in the presence of the gravity force, while the temperature and concentration equations were solved separately using an explicit finite-difference technique at the Boltzmann scale.FindingsThe monocellular nature of the flow, obtained forR = 0 is not destroyed by varying the cavity inclination and the Soret parameter but rather by the increase of the parameter R. The Soret parameter and the cavity inclination become perceptible at high values ofR. The inclinationγ = 60° leads to high mean temperatures compared to the other inclinations. The effect ofRon mean concentration is amplified in the presence of Soret effect but limited in the absence of the latter. The negative Soret parameter combined with high internal heat generation and a relatively high inclination is important when the objective is to maintain the fluid at a high concentration of species. The presence of bicellular flow combined with the important elevation undergone by the fluid temperature, makes both the cold and hot walls playing a cooling role with the most important exchanges taking place at the upper part of these walls. The analysis of the mean mass transfer shows that the increase of the inclination may lead to an increase or a decrease of the mass transfer depending on the range ofR, in the case of Sr = 0. However, for Sr = −0.5, it is observed that the increase ofγis generally accompanied by a reduction of the mass transfer.Originality/valueTo the best of the authors’ knowledge, the hybrid LBM-FD was not used before to study such a problem. Combined effect ofRand inclination may be useful in charging the fluid with species when the objective is to maintain high concentrations in the medium.

scholarly journals Analytical Solution for Heat Transfer in Electroosmotic Flow of a Carreau Fluid in a Wavy Microchannel

2019 ◽  
Vol 9 (20) ◽  
pp. 4359 ◽  
Author(s):  
Saima Noreen ◽  
Sadia Waheed ◽  
Abid Hussanan ◽  
Dianchen Lu
Keyword(s):  
Fluid Flow ◽  
Flow Pattern ◽  
Flow Rate ◽  
Electroosmotic Flow ◽  
Linear Problem ◽  
Perturbation Technique ◽  
Volumetric Flow Rate ◽  
Carreau Fluid ◽  
Long Wavelength ◽  
Wide Range

This article explores the heat and transport characteristics of electroosmotic flow augmented with peristaltic transport of incompressible Carreau fluid in a wavy microchannel. In order to determine the energy distribution, viscous dissipation is reckoned. Debye Hückel linearization and long wavelength assumptions are adopted. Resulting non-linear problem is analytically solved to examine the distribution and variation in velocity, temperature and volumetric flow rate within the Carreau fluid flow pattern through perturbation technique. This model is also suitable for a wide range of biological microfluidic applications and variation in velocity, temperature and volumetric flow rate within the Carreau fluid flow pattern.

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