Entropy Analysis of a Convective Film Flow of a Power-Law Fluid with Nanoparticles Along an Inclined Plate

Vasu, B.; Gorla, Rama Subba Reddy; Murthy, P. V. S. N.; Bég, O. Anwar

doi:10.1134/s0021894419050067

Cited by 15 publications

(3 citation statements)

References 44 publications

(51 reference statements)

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“…( ) A change in the amount of entropy in the flow of nanofluids is predicted. As there are also certain variations in thermal transport, it is possible to describe the total entropy [34][35][36][37] as follows:…”

Section: Densitymentioning

confidence: 99%

Heat transfer and entropy generation analysis of water-Fe3O4/CNT hybrid magnetic nanofluid flow in a trapezoidal wavy enclosure containing porous media with the Galerkin finite element method

et al. 2021

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The present study addresses theoretically and computationally the performance of electrically conducting water-Fe3O4/CNT hybrid nanofluid in three-dimensional natural convective heat transfer and entropy generation within a wavy-walled trapezoidal enclosure. The enclosure has two layers -a hybrid nanofluid layer and a porous medium layer. A transverse magnetic field is applied in the upward direction. Newtonian flow is considered and the modified Navier-Stokes equations are employed with Lorentz hydromagnetic body force, Darcian and Forchheimer drag force terms. The wavy side planes are heated down while the top and vertical planes are thermally insulated. A rectangular heated fin is placed in the lower plane and several different locations of the fin are considered. The transformed, non-dimensional system of coupled non-linear partial differential equations with associated boundary conditions is solved numerically with the Galerkin finite element method (FEM) in the COMSOL Multiphysics software platform. The effects of Darcy number, Hartmann number, volume fraction, undulation number of the wavy wall and Rayleigh number (thermal buoyancy parameter) on the streamlines, isotherms and Bejan number contours are studied. Extensive visualization of the thermal flow characteristics is included. With increasing Hartmann number and Rayleigh number, the average Bejan number is reduced strongly whereas average Nusselt number is only depleted significantly at very high Rayleigh number and high Hartmann number. With increasing undulation number, there is a slight elevation in average Bejan number at intermediate Rayleigh numbers, whereas the average Nusselt number is substantially boosted, and the effect is maximized at very high Rayleigh number. Increment in Darcy number (i. e. reduction in permeability of the porous medium layer) is observed to considerably elevate average Nusselt number at high values of Rayleigh number, whereas the contrary response is computed in average Bejan number. The simulations are relevant to hybrid magnetic nanofluid fuel cells and electromagnetic nano-materials processing in cavities.

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Section: Densitymentioning

confidence: 99%

Heat transfer and entropy generation analysis of water-Fe3O4/CNT hybrid magnetic nanofluid flow in a trapezoidal wavy enclosure containing porous media with the Galerkin finite element method

et al. 2021

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“…In further studies, Garoosi et al 82 83 carried out a numerical simulation for natural and mixed convection of water-based Al 2 O 3 nanofluid in a square cavity applying Buongiorno model. Using the Homotopy semi-numerical modeling method for non-Newtonian nanofluid external to three different geometries with variable wall temperature and nanoparticle concentration condition, Buongiorno model was used by Ray et al 84 Considering the effects of Brownian motion and thermophoresis, Vasu et al 85 conducted an entropy analysis in steady laminar thin film convection flow of a power-law fluid with nanoparticles using Buongiorno's model. Gorla et al 86 investigated the mixed convective boundary layer flow adjacent to a vertical stretching surface using the Buongiorno model for non-Newtonian nanofluid in unsteady condition.…”

Section: Single-phase Approachesmentioning

confidence: 99%

Blood Flow Mediated Hybrid Nanoparticles in Human Arterial System: Recent Research, Development and Applications

et al. 2021

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Blood flow dynamics contributes an elemental part in the formation and expansion of cardiovascular diseases in human body. Computational simulation of blood flow in the human arterial system has been widely used in recent decades for better understanding the symptomatic spectrum of various diseases, in order to improve already existing or develop new therapeutic techniques. The characteristics of the blood flow in an artery can be changed significantly by arterial diseases, such as aneurysms and stenoses. The progress of atherosclerosis or stenosis in a blood vessel is quite common which may be caused due to the addition of lipids in the arterial wall. Nanofluid is a colloidal mixture of nanometer sized (which ranges from 10–100 m) metallic and non-metallic particles in conventional fluid (such as water, oil). The delivery of nanoparticles is an interesting and growing field in the development of diagnostics and remedies for blood flow complications. An enhancement of nano-drug delivery performance in biological systems, nanoparticles properties such as size, shape and surface characteristics can be regulated. Nanoparticle offers remarkably advantages over the traditional drug delivery in terms of high specificity, high stability, high drug carrying capacity, ability for controlled release. Highly dependency has been found for their behavior under blood flow while checking for their ability to target and penetrate tissues from the blood. In the field of nano-medicine, organic (including polymeric micelles and vesicles, liposomes) and inorganic (gold and mesoporous silica, copper) nanoparticles have been broadly studied as particular carriers because as drug delivery systems they delivered a surprising achievement as a result of their biocompatibility with tissue and cells, their subcellular size, decreased toxicity and sustained release properties. For the extension of nanofluids research, the researchers have also tried to use hybrid nanofluid recently, which is synthesized by suspending dissimilar nanoparticles either in mixture or composite form. The main idea behind using the hybrid nanofluid is to further improve the heat transfer and pressure drop characteristics. Nanoparticles are helpful as drug carriers to minimize the effects of resistance impedance to blood flow or coagulation factors due to stenosis. Discussed various robust approaches have been employed for the nanoparticle transport through blood in arterial system. The main objective of the paper is to provide a comprehensive review of computational simulations of blood flow containing hybrid-nanoparticles as drug carriers in the arterial system of the human body. The recent developments and analysis of convective flow of particle-fluid suspension models for the axi-symmetric arterial bodies in hemodynamics are summarized. Detailed existing mathematical models for simulating blood flow with nanoparticles in stenotic regions are reviewed. The review focuses on selected numerical simulations of physiological convective flows under various stenosis approximations and computation of the temperature, velocity, resistance impedance to flow, wall shear stress and the pressure gradient with the corresponding boundary conditions. The current review also highlights that the drug carrier nanoparticles are efficient mechanisms for reducing hemodynamics of stenosis and could be helpful for other biomedical applications. The review considers flows through various stenoses and the significances of numerical fluid mechanics in clinical medicine. The review examines nano-drug delivery systems, nanoparticles and describes recent computational simulations of nano-pharmacodynamics.

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“…The power-law viscosity model is the simplest generalized Newtonian fluid model (Vasu et al, 2016). But this model has certain limitations; it cannot estimate the viscosity for small/ large shear rates.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of Carreau nanofluid flow past vertical plate with the Cattaneo–Christov heat flux model

Vasu

Ray

2019

HFF

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Purpose To achieve material-invariant formulation for heat transfer of Carreau nanofluid, the effect of Cattaneo–Christov heat flux is studied on a natural convective flow of Carreau nanofluid past a vertical plate with the periodic variations of surface temperature and the concentration of species. Buongiorno model is considered for nanofluid transport, which includes the relative slip mechanisms, Brownian motion and thermophoresis. Design/methodology/approach The governing equations are non-dimensionalized using suitable transformations, further reduced to non-similar form using stream function formulation and solved by local non-similarity method with homotopy analysis method. The numerical computations are validated and verified by comparing with earlier published results and are found to be in good agreement. Findings The effects of varying the physical parameters such as Prandtl number, Schmidt number, Weissenberg number, thermophoresis parameter, Brownian motion parameter and buoyancy ratio parameter on velocity, temperature and species concentration are discussed and presented through graphs. The results explored that the velocity of shear thinning fluid is raised by increasing the Weissenberg number, while contrary response is seen for the shear thickening fluid. It is also found that heat transfer in Cattaneo–Christov heat conduction model is less than that in Fourier’s heat conduction model. Furthermore, the temperature and thermal boundary layer thickness expand with the increase in thermophoresis and Brownian motion parameter, whereas nanoparticle volume fraction increases with increase in thermophoresis parameter, but reverse trend is observed with increase in Brownian motion parameter. Originality/value The present investigation is relatively original as very little research has been reported on Carreau nanofluids under the effect of Cattaneo–Christov heat flux model.

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Entropy Analysis of a Convective Film Flow of a Power-Law Fluid with Nanoparticles Along an Inclined Plate

Abstract: Ti t l e E n t r o py a n alysi s o n c o nv e c tiv e fil m flow of p o w e r-la w fluid wi t h n a n o p a r ti cl e s alo n g a n inclin e d pl a t e

Cited by 15 publications

References 44 publications

Heat transfer and entropy generation analysis of water-Fe3O4/CNT hybrid magnetic nanofluid flow in a trapezoidal wavy enclosure containing porous media with the Galerkin finite element method

Heat transfer and entropy generation analysis of water-Fe3O4/CNT hybrid magnetic nanofluid flow in a trapezoidal wavy enclosure containing porous media with the Galerkin finite element method

Blood Flow Mediated Hybrid Nanoparticles in Human Arterial System: Recent Research, Development and Applications

Numerical study of Carreau nanofluid flow past vertical plate with the Cattaneo–Christov heat flux model

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