scholarly journals Comparative analysis of magnetized partially ionized copper, copper oxide–water and kerosene oil nanofluid flow with Cattaneo–Christov heat flux

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Nomana Abid ◽  
Muhammad Ramzan ◽  
Jae Dong Chung ◽  
Seifedine Kadry ◽  
Yu-Ming Chu
Keyword(s):  
Comparative Analysis ◽  
Copper Oxide ◽  
Fluid Velocity ◽  
Nonlinear Partial Differential Equations ◽  
Temperature Fields ◽  
Transfer Model ◽  
Fluid Temperature ◽  
Nanoparticles Concentration ◽  
Partially Ionized ◽  
The Impact

Abstract This comparative analysis studies the impact of two different nanoparticles Copper and Copper Oxide in two different partially ionized magnetofluid (water and kerosene oil mixed with Copper/Copper Oxide) flows over a linearly stretching surface. The impacts of electrons and ions collisions in the presence of the Cattaneo-Christov heat transfer model are also investigated. The effects of prominent parameters on velocity and temperature fields are depicted through graphical illustrations. A similarity transformation procedure is applied to transform the nonlinear partial differential equations to the ordinary one. Our numerical methodology is based upon the Finite difference method that is the default method in the bvp4c built-in function of the MATLAB scheme. Nusselt number and Skin drag coefficient are computed numerically and presented in tabular form for both types of nanofluids over a linear stretched surface. Our results demonstrate that the effects of CuO are dominant in comparison to the Cu on fluid velocity. The fluid temperature is more prominent in the case of Cu-water nanofluid when we increase nanoparticles concentration.

Magnetohydrodynamic Mixed Convective Flow Due to a Vertical Plate With Induced Magnetic Field

2018 ◽  
Vol 10 (6) ◽  
Author(s):  
R. Nandkeolyar ◽  
M. Narayana ◽  
S. S. Motsa ◽  
P. Sibanda
Keyword(s):  
Magnetic Field ◽  
Partial Differential Equations ◽  
Differential Equations ◽  
Fluid Velocity ◽  
Nonlinear Partial Differential Equations ◽  
Linearization Method ◽  
Fluid Temperature ◽  
Magnetic Field Effects ◽  
Induced Magnetic Field ◽  
Partial Differential

The steady hydromagnetic flow of a viscous, incompressible, perfectly conducting, and heat absorbing fluid past a vertical flat plate under the influence of an aligned magnetic field is studied. The flow is subject to mixed convective heat transfer. The fluid is assumed to have a reasonably high magnetic Prandtl number which causes significant-induced magnetic field effects. Such fluid flows find application in many magnetohydrodynamic devices including MHD power-generation. The effects of viscous dissipation and heat absorption by the fluid are investigated. The governing nonlinear partial differential equations are converted into a set of nonsimilar partial differential equations which are then solved using a spectral quasi-linearization method (SQLM). The effects of the important parameters on the fluid velocity, induced magnetic field, fluid temperature and as well as on the coefficient of skin-friction and the Nusselt number are discussed qualitatively.

Impact of Joule heating and viscous dissipation on magnetohydrodynamics boundary layer flow of viscous nanofluid subject to the stretched surface

2021 ◽  
pp. 095440892110641
Author(s):  
M. Riaz Khan ◽  
Awatef Abidi ◽  
Jamel Madiouli ◽  
Kamel Guedri ◽  
A.M. Al-Bugami ◽  
...  
Keyword(s):  
Nusselt Number ◽  
Differential Equations ◽  
Skin Friction ◽  
Viscous Dissipation ◽  
Joule Heating ◽  
Base Fluid ◽  
Fluid Temperature ◽  
Suction Parameter ◽  
Nanoparticles Concentration ◽  
The Impact

The two-dimensional magnetohydrodynamics incompressible flow of nanofluid about a stretching surface is investigated with the existence of viscous dissipation and Joule heating. Moreover, the impact of the convective condition and mass suction is applied with the viscous nanofluid containing copper nanoparticles and the base fluid water. The similarity variables have been employed to transform the coupled nonlinear partial differential equations into the ordinary differential equations and the numerical scheme bp4c is implemented for the further analysis of the solution. The diverse results of temperature, skin friction coefficient, velocity, and the Nusselt number according to numerous parameters have been shown graphically. It appears that the Nusselt number and the skin friction reduces, which is caused by the enhancement of both Hartman number and nanoparticles concentration. Moreover, the fluid temperature surges with the growth of Biot number, and Eckert number whereas the growth of nanoparticles concentration and suction parameter diminishes the velocity and temperature profile. The inclusion of a significant quantity of nanoparticles in the base fluid increases the density of the corresponding nanofluids and accordingly the temperature of the coupled nanoparticles in the base fluids can be modified. Hence, nanofluids build an outstanding performance in electronic components appliances and other electrical devices. The existing research is further effective in refrigerators for stabilizing their rate of cooling.

scholarly journals Mathematical modeling and thermodynamics of Prandtl–Eyring fluid with radiation effect: a numerical approach

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Zakir Ullah ◽  
Ikram Ullah ◽  
Gul Zaman ◽  
Hamda Khan ◽  
Taseer Muhammad
Keyword(s):  
Differential Equations ◽  
Skin Friction ◽  
Fluid Velocity ◽  
Convective Boundary Condition ◽  
Numerical Approach ◽  
Temperature Fields ◽  
Main Concern ◽  
Fluid Temperature ◽  
Convective Boundary ◽  
Linear Ordinary Differential Equations

AbstractMain concern of current research is to develop a novel mathematical model for stagnation-point flow of magnetohydrodynamic (MHD) Prandtl–Eyring fluid over a stretchable cylinder. The thermal radiation and convective boundary condition are also incorporated. The modeled partial differential equations (PDEs) with associative boundary conditions are deduced into coupled non-linear ordinary differential equations (ODEs) by utilizing proper similarity transformations. The deduced dimensionless set of ODEs are solved numerically via shooting method. Behavior of controlling parameters on the fluid velocity, temperature fields as well as skin friction and Nusselt number are highlighted through graphs. Outcome declared that dimensionless fluid temperature boosts up for both the radiation parameter and Biot number. It is also revealed that the magnitude of both heat transfer rate and skin friction enhance for higher estimation of curvature parameter. Furthermore, comparative analysis between present and previous reports are provided for some specific cases to verify the obtained results.

Heterogeneous and Homogeneous Reaction Analysis on MHD Oldroyd-B Fluid with Cattaneo-Christov Heat Flux Model and Convective Heating

2018 ◽  
Vol 387 ◽  
pp. 194-206 ◽  
Author(s):  
Sheniyappan Eswaramoorthi ◽  
Marimuthu Bhuvaneswari ◽  
S. Sivasankaran ◽  
Oluwole Daniel Makinde
Keyword(s):  
Heat Flux ◽  
Fluid Velocity ◽  
Mhd Flow ◽  
Convective Heating ◽  
Fluid Temperature ◽  
Suction Parameter ◽  
Flux Model ◽  
Homogeneous Chemical ◽  
The Impact ◽  
Heat Flux Model

The impact of Cattaneo-Christov heat flux model for the MHD flow of an Oldroyd-B fluid on a stretching plate with convective heating and heterogeneous-homogeneous chemical reactions were analyzed. The governing PDE’s are converted into a nonlinear ODE’s with appropriate similarity variables and it is solved using homotopy analysis method (HAM). The graphical results of velocity, temperature and concentration profiles are presented(detailed). We found that the fluid velocity reduces with enhancing the injection/suction parameter. In addition, the fluid temperature boosted up when rising the Biot number and the solutal boundary layer thickness reduces both heterogeneous and homogeneous chemical reaction parameters.

scholarly journals On cattaneo-christov heat flux analysis with magneto-hydrodynamic and heat generation effects in a Carreau nano-fluid over a stretching sheet

2019 ◽  
Vol 65 (5 Sept-Oct) ◽  
pp. 479 ◽  
Author(s):  
Usman Ali ◽  
Ali S. Alqahtani ◽  
Khalil Ur Rehman ◽  
And M.Y. Malik
Keyword(s):  
Differential Equations ◽  
Heat Generation ◽  
Stretching Sheet ◽  
Fluid Model ◽  
Fluid Velocity ◽  
Flux Analysis ◽  
Mathematical Form ◽  
Fluid Temperature ◽  
Nano Fluid ◽  
The Impact

This pagination specifies the characteristics of Carreau nano-fluid model embedded with hydro-magnetic (MHD) effects and the energy equation is extracted through Cattaneo-Christov approach. The process of heat generation and chemical reaction are also carried out whereas the fluid flow having infinite shear rate viscosity is induced by the stretching sheet. The mathematical form is developed in order to get the coupled partial differential equations and admissible similarity transforms are used to construct the set of ordinary differential equations and then sorted out numerically by applying Runge-Kutta Fehlberg method supported with shooting scheme. The graphs are plotted that portrays the impact of fluid velocity and temperature towards various engineering parameters which reveals that the fluid temperature increases when enlarging heat generation parameter. The validations for the numerical values of skin friction coefficient are delineated with the existing literature [33]. Also, the numerical findings for the local Nusselt number are offered.

scholarly journals Heat Transfer Analysis of 3-D Viscoelastic Nanofluid Flow Over a Convectively Heated Porous Riga Plate with Cattaneo-Christov Double Flux

2021 ◽  
Vol 9 ◽  
Author(s):  
K. Loganathan ◽  
Nazek Alessa ◽  
Safak Kayikci
Keyword(s):  
Brownian Motion ◽  
Volume Fraction ◽  
Fluid Velocity ◽  
Heat Transfer Analysis ◽  
Fluid Temperature ◽  
Heat Absorption ◽  
Nanoparticle Volume Fraction ◽  
Riga Plate ◽  
Viscoelastic Nanofluid ◽  
The Impact

The impact of heat-absorbing viscoelastic nanofluidic flow along with a convectively heated porous Riga plate with Cattaneo-Christov double flux was analytically investigated. The Buongiorno model nanofluid was implemented with the diversity of Brownian motion and thermophoresis. Making use of the transformations; the PDE systems are altered into an ODE system. We use the homotopy analysis method to solve these systems analytically. The reaction of the apposite parameters on fluid velocity, fluid temperature, nanoparticle volume fraction skin friction coefficients (SFC), local Nusselt number and local Sherwood number are shown with vividly explicit details. It is found that the fluid velocities reflect a declining nature for the development of viscoelastic and porosity parameters. The liquid heat becomes rich when escalating the radiation parameter. In addition, the nanoparticle volume fraction displays a declining nature towards the higher amount of thermophoresis parameter, whereas the inverse trend was obtained for the Brownian motion parameter. We also found that the fluid temperature is increased in viscoelastic nanofluid compared to the viscous nanofluid. When we change the fluid nature from heat absorption to heat generation, the liquid temperature also rises. In addition, the fluid heat is suppressed when we change the flow medium from a stationary plate to a Riga plate for heat absorption/generation cases.

scholarly journals Stratified Flow of Micropolar Nanofluid over Riga Plate: Numerical Analysis

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 316
Author(s):  
Khuram Rafique ◽  
Hammad Alotaibi ◽  
Nida Ibrar ◽  
Ilyas Khan
Keyword(s):  
Numerical Analysis ◽  
Fluid Velocity ◽  
Nonlinear Partial Differential Equations ◽  
Practical Interest ◽  
Physical Parameters ◽  
Boundary Layer Equations ◽  
Micropolar Nanofluid ◽  
Riga Plate ◽  
The Impact ◽  
Physical Quantities

In this article, we present a numerical analysis of the energy and mass transport behavior of microrotational flow via Riga plate, considering suction or injection and mixed convection. The thermal stratified parameters of nanofluid are captured using an interpretation of the well-known Keller box model, which helps us to determine the characteristic properties of the physical parameters. The formulated boundary layer equations (nonlinear partial differential equations) are transformed into coupled ODEs with nonlinearities for the stratified controlled regimes. The impact of embedded flow and all physical quantities of practical interest, such as velocity, temperature, and concentration profile, are inspected and presented through tables and graphs. We found that the heat transfer on the surface decreases for the temperature stratification factor as mass transfer increases. Additionally, the fluid velocity increases as the modified Hartmann number increases.

Corruption as “one‑stop‑shop”: theory and empirical analysis

2018 ◽  
pp. 32-51
Author(s):  
R. Yu. Kochnev ◽  
L. I. Polishchuk ◽  
A. Yu. Rubin
Keyword(s):  
Comparative Analysis ◽  
Business Environment ◽  
Enterprise Performance ◽  
Double Jeopardy ◽  
One Stop ◽  
The Commons ◽  
Public Production ◽  
Performance Project ◽  
The Impact ◽  
Sector Theory

We present the comparative analysis of the impact of centralized and decentralized corruption for private sector. Theory and empirical evidence point out to a “double jeopardy” of decentralized corruption which increases the burden of corruption upon private firms and weakens the incentives of bureaucracy to provide public production inputs, such as infrastructure. These outcomes are produced by simultaneous free-riding and the tragedy of the commons effects. The empirical part of the paper utilizes data of the Business Environment and Enterprise Performance project.

Assessment of small businesses activities in Ukraine

2019 ◽  
pp. 40-47
Author(s):  
Igor Ponomarenko ◽  
Kateryna Volovnenko
Keyword(s):  
Comparative Analysis ◽  
Statistical Analysis ◽  
Small Business ◽  
Small Businesses ◽  
Government Agencies ◽  
Small Enterprises ◽  
The Subject ◽  
Business Entities ◽  
The Impact ◽  
Micro Enterprises

The subject of the research is a set of approaches to the statistical analysis ofthe activities of small business entities in Ukraine, including micro-enterprises. The purpose of writing this article is to study of the features of functioningof small business entities in Ukraine. Methodology. The research methodology isto use a system-structural and comparative analysis (to study the change in thenumber of small enterprises by major components); monographic (when studyingmethods of statistical analysis of small businesses); economic analysis (when assessing the impact of small business entities on socio-economic phenomena andprocesses in Ukraine). The scientific novelty consists to determine the features ofthe functioning of small businesses in Ukraine in modern conditions. The influenceof the activities of the main socio-economic and political indicators on the activities of small enterprises in recent periods of time has been identified. It has beenestablished that there is flexibility in the development of strategies by small businesses in conditions of significant competition, which makes it possible to quicklyrespond to changing situations in specific markets. Conclusions. The use of acomprehensive statistical analysis of small businesses functioning in Ukraine willallow government agencies to develop a set of measures to optimize the activitiesof these enterprises, which ultimately will positively affect the strengthening oftheir competitiveness and will contribute to the growth of the national economicsystem.

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