Study of radiative Reiner-Philippoff nanofluid model with gyrotactic microorganisms and activation energy: A Cattaneo-Christov Double Diffusion (CCDD) model analysis

Author(s):  
Yun-Xiang Li ◽  
Hassan Waqas ◽  
Kamel Al-Khaled ◽  
Sajjad Hussain ◽  
Sami Ullah Khan ◽  
...  
Heat Transfer ◽  
2021 ◽  
Author(s):  
Anigere Marikempaiah Jyothi ◽  
Rangaswamy Naveen Kumar ◽  
Ramanahalli Jayadevamurthy Punith Gowda ◽  
Yarranna Veeranna ◽  
Ballajja Chandrappa Prasannakumara

Symmetry ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 309 ◽  
Author(s):  
Zahra Abdelmalek ◽  
Sami Ullah Khan ◽  
Hassan Waqas ◽  
Hossam A. Nabwey ◽  
Iskander Tlili

In recent decades, an interest has been developed towards the thermal consequences of nanofluid because of utilization of nano-materials to improve the thermal conductivity of traditional liquid and subsequently enhance the heat transportation phenomenon. Following this primarily concept, this current work investigates the thermal developed flow of third-grade nanofluid configured by a stretched surface with additional features of activation energy, viscous dissipation and second-order slip. Buongiorno’s nanofluid model is used to explore the thermophoresis and Brownian motion features based on symmetry fundamentals. It is further assumed that the nanoparticles contain gyrotactic microorganisms, which are associated with the most fascination bioconvection phenomenon. The flow problem owing to the partial differential equations is renovated into dimensional form, which is numerically simulated with the help of bvp4c, by using MATLAB software. The aspects of various physical parameters associated to the current analysis are graphically examined against nanoparticles’ velocity, temperature, concentration and gyrotactic microorganisms’ density distributions. Further, the objective of local Nusselt number, local Sherwood number and motile density number are achieved numerically with variation of various parameters. The results presented here may find valuable engineering applications, like cooling liquid metals, solar systems, power production, solar energy, thermal extrusion systems cooling of machine equipment, transformer oil and microelectronics. Further, flow of nanoparticles containing gyrotactic microorganisms has interesting applications in microbial fuel cells, microfluidic devices, bio-technology and enzyme biosensors.


2019 ◽  
Vol 94 (12) ◽  
pp. 125203 ◽  
Author(s):  
M Ijaz Khan ◽  
Fazal Haq ◽  
T Hayat ◽  
A Alsaedi ◽  
Mujeeb Ur Rahman

Author(s):  
Fazal Haq ◽  
Muzher Saleem ◽  
M Ijaz Khan ◽  
Sami Ullah Khan ◽  
Mohammed Jameel ◽  
...  

Here theoretical analysis of heat, mass and motile microorganisms transfer rates in Casson fluid flow over stretched permeable surface of cylinder is studied. Investigated is carried out in the presence of suspended nanoparticles and self-propelled gyrotactic microorganisms. The effects of buoyancy forces, magnetic field and thermal radiation are considered. The nanoparticles with suitable suspension are stabilized through mutual effects of buoyancy forces and bioconvection. Furthermore, activation energy and Darcy- Forchheimer effects on bio nanofluid flow are accounted. The constitutive theories are executed to develop the model formulation. The obtained model is made dimensionless trough appropriate transformations. The dimensionless flow model is tackled by built-in algorithm of shooting technique. Impact of flow controlling constraints parameters is physically elaborated by making graphical illustrations. The outcomes based on numerical data against essential engineering formulations like surface drag force, Nusselt, density and Sherwood numbers are tabulated. Main outcomes are successfully summarized in terms of closing remarks.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Manoj Kumar Nayak ◽  
Sachin Shaw ◽  
H. Waqas ◽  
Taseer Muhammad

Purpose The purpose of this study is to investigate the Cattaneo-Christov double diffusion, multiple slips and Darcy-Forchheimer’s effects on entropy optimized and thermally radiative flow, thermal and mass transport of hybrid nanoliquids past stretched cylinder subject to viscous dissipation and Arrhenius activation energy. Design/methodology/approach The presented flow problem consists of the flow, heat and mass transportation of hybrid nanofluids. This model is featured with Casson fluid model and Darcy-Forchheimer model. Heat and mass transportations are represented with Cattaneo-Christov double diffusion and viscous dissipation models. Multiple slip (velocity, thermal and solutal) mechanisms are adopted. Arrhenius activation energy is considered. For graphical and numerical data, the bvp4c scheme in MATLAB computational tool along with the shooting method is used. Findings Amplifying curvature parameter upgrades the fluid velocity while that of porosity parameter and velocity slip parameter whittles down it. Growing mixed convection parameter, curvature parameter, Forchheimer number, thermally stratified parameter intensifies fluid temperature. The rise in curvature parameter and porosity parameter enhances the solutal field distribution. Surface viscous drag gets controlled with the rising of the Casson parameter which justifies the consideration of the Casson model. Entropy generation number and Bejan number upgrades due to growth in diffusion parameter while that enfeeble with a hike in temperature difference parameter. Originality/value To the best of the authors’ knowledge, this research study is yet to be available in the existing literature.


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