Double-diffusive convective Peristaltic motion of Casson nanofluid with variable-viscosity in an endoscope

The peristaltic flow of a viscoelastic fluid in the tapered microchannel with variable viscosity is investigated. This study is reinvigorated by discovering fluid dynamic in peristaltic motion as signified by biological flows, pharmacodynamics and gastro-intestinal motility enhancement. The microchannel non-uniform and asymmetry is developed by choosing a peristaltic wave train on the wall with different amplitudes and phases. The flow analysis has been arisen for low Reynolds number and long wavelength case. The solutions for stream function, axial velocity and pressure gradient are obtained. The effects of pertinent parameters on the average pressure rise per wavelength are investigated by means of numerical integration. The axial velocity and phenomena of trapping are further discussed.

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Effects of Slip and Radiation on Convective MHD Casson Nanofluid Flow over a Stretching Sheet Influenced by Variable Viscosity

Journal of Engineering Thermophysics ◽

10.1134/s1810232820020125 ◽

2020 ◽

Vol 29 (2) ◽

pp. 303-315 ◽

Cited By ~ 1

Author(s):

F. Mabood ◽

S. M. Ibrahim ◽

P. V. Kumar ◽

G. Lorenzini

Keyword(s):

Stretching Sheet ◽

Variable Viscosity ◽

Nanofluid Flow ◽

Casson Nanofluid

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Non-similar solution of Casson nanofluid with variable viscosity and variable thermal conductivity

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

10.1108/hff-08-2019-0629 ◽

2019 ◽

Vol 30 (8) ◽

pp. 3919-3938 ◽

Cited By ~ 2

Author(s):

Ankita Bisht ◽

Rajesh Sharma

Keyword(s):

Thermal Conductivity ◽

Stretching Sheet ◽

Variable Viscosity ◽

Variable Thermal Conductivity ◽

Solar Thermal ◽

Content Type ◽

Casson Nanofluid ◽

Solar Thermal Collectors ◽

Variation Parameter ◽

Nonlinear Stretching

Purpose The purpose of this study is to provide a numerical investigation of Casson nanofluid along a vertical nonlinear stretching sheet with variable thermal conductivity and viscosity. Design/methodology/approach The boundary-layer equations are presented in the dimensionless form using proper non-similar transformations. The subsequent non-dimensional nonlinear partial differential equations are solved using the implicit finite difference technique. To linearize the nonlinear terms present in these equations, the quasilinearization technique is used. Findings The investigation showed graphically the temperature, velocity and nanoparticle volume fraction for particular included physical parameters. It is observed that the velocity profile decreases with an increase in the values of Casson fluid parameter while increases with an increase in the viscosity variation parameter. The temperature profile enhances for large values of velocity variation parameter and thermal conductivity parameter while it reduces for large values of thermal buoyancy parameter. Further, the Nusselt number and skin-friction coefficient are introduced which are helpful in determining the physical aspects of Casson nanofluid flow. Practical implications The immediate control of heat transfer in the industrial system is crucial because of increasing energy prices. Recently, nanotechnology is proposed to control the heat transfer phenomenon. Ongoing research in complex nanofluid has been fruitful in various applications such as solar thermal collectors, nuclear reactors, electronic equipment and diesel–electric conductor. A reasonable amount of nanoparticle when added to the base fluid in solar thermal collectors serves to deeper absorption of incident radiation, and hence it upgrades the efficiency of the solar thermal collectors. Originality/value The non-similar solution of Casson nanofluid due to a vertical nonlinear stretching sheet with variable viscosity and thermal conductivity is discussed in this work.

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MHD three dimensional double diffusive flow of Casson nanofluid with buoyancy forces and nonlinear thermal radiation over a stretching surface

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

10.1108/hff-01-2017-0022 ◽

2017 ◽

Vol 27 (12) ◽

pp. 2858-2878 ◽

Cited By ~ 9

Author(s):

B.J. Gireesha ◽

M. Archana ◽

Prasannakumara B.C. ◽

R.S. Reddy Gorla ◽

Oluwole Daniel Makinde

Keyword(s):

Thermal Radiation ◽

Three Dimensional ◽

Lewis Number ◽

Nonlinear Thermal Radiation ◽

Stretching Surface ◽

Temperature Ratio ◽

Content Type ◽

Casson Nanofluid ◽

Diffusive Flow ◽

Double Diffusive

Purpose This paper aims to deal with the study of heat and mass transfer on double-diffusive three-dimensional hydromagnetic boundary layer flow of an electrically conducting Casson nanofluid over a stretching surface. The combined effects of nonlinear thermal radiation, magnetic field, buoyancy forces, thermophoresis and Brownian motion are taken into consideration with convective boundary conditions. Design/methodology/approach Similarity transformations are used to reduce the governing partial differential equations into a set of nonlinear ordinary differential equations. The reduced equations were numerically solved using Runge–Kutta–Fehlberg fourth-fifth-order method along with shooting technique. Findings The impact of several existing physical parameters such as Casson parameter, mixed convection parameter, regular buoyancy ratio parameter, radiation parameter, Brownian motion parameter, thermophoresis parameter, temperature ratio parameter on velocity, temperature, solutal and nanofluid concentration profiles are analyzed through graphs and tables in detail. It is found that the solutal component increases for Dufour Lewis number, whereas it decreases for nanofluid Lewis number. Moreover, velocity profiles decrease for Casson parameter, while the Nusselt number increases for Biot number, radiation and temperature ratio parameter. Originality/value This paper is a new work related to three-dimensional double-diffusive flow of Casson nanofluid with buoyancy and nonlinear thermal radiation effect.

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