scholarly journals Bioconvection and activation energy dynamisms on radiative sutterby melting nanomaterial with gyrotactic microorganism

2022 ◽  
Vol 30 ◽  
pp. 101749
Author(s):  
Muhammad Azam ◽  
Fazle Mabood ◽  
Masood Khan
Keyword(s):  
Activation Energy ◽  
Gyrotactic Microorganism

scholarly journals Unsteady transient slip flow of Williamson nanofluid containing gyrotactic microorganism and activation energy

2020 ◽  
Vol 59 (6) ◽  
pp. 4315-4328 ◽  
Author(s):  
A. Aldabesh ◽  
Sami Ullah Khan ◽  
Danial Habib ◽  
Hassan Waqas ◽  
Iskander Tlili ◽  
...  
Keyword(s):  
Activation Energy ◽  
Slip Flow ◽  
Gyrotactic Microorganism

Analysis of Buongiorno’s nanofluid model in marangoni convective flow with gyrotactic microorganism and activation energy

2021 ◽  
pp. 2150072
Author(s):  
M. Ijaz Khan ◽  
Yu-Ming Chu ◽  
Faris Alzahrani ◽  
Aatef Hobiny
Keyword(s):  
Activation Energy ◽  
Nusselt Number ◽  
Heat Source ◽  
Marangoni Number ◽  
Marangoni Convection ◽  
Mhd Flow ◽  
Momentum Equation ◽  
Number Magnitude ◽  
Gyrotactic Microorganism ◽  
Source Sink

This communication is to analyze the Marangoni convection MHD flow of nanofluid. Marangoni convection is very useful physical phenomena in presence of microgravity conditions which is generated by gradient of surface tension at interface. We have also studied the swimming of migratory gyrotactic microorganisms in nanofluid. Flow is due to rotation of disk. Heat and mass transfer equations are examined in detail in the presence of heat source sink and Joule heating. Nonlinear mixed convection effect is inserted in momentum equation. Appropriate transformations are applied to find system of equation. HAM technique is used for convergence of equations. Radial and axial velocities, concentration, temperature, motile microorganism profile, Nusselt number and Sherwood number are sketched against important parameters. Marangoni ratio parameter and Marangoni number are increasing functions of axial and radial velocities. Temperature rises for Marangoni number and heat source sink parameter. Activation energy and chemical reaction rate parameter have opposite impact on concentration profile. Motile density profile decays via Peclet number and Schmidt number. Magnitude of Nusselt number enhances via Marangoni ratio parameter.

scholarly journals Bioconvection in Cross Nano-Materials with Magnetic Dipole Impacted by Activation Energy, Thermal Radiation, and Second Order Slip

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1019
Author(s):  
Zahra Abdelmalek ◽  
Kamel Al-Khaled ◽  
Hassan Waqas ◽  
A. Aldabesh ◽  
Sami Ullah Khan ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Radiation ◽  
Magnetic Dipole ◽  
Second Order ◽  
Nonlinear Thermal Radiation ◽  
Nano Materials ◽  
Flow Equations ◽  
Radiation Activation ◽  
Magnetic Nanomaterial ◽  
Gyrotactic Microorganism

Ferro liquids derive their magneto–viscous behavior from the suspended magnetic nanomaterial that enables tunable changes in temperature, as well as nano-structured fluid characteristics. A theoretical model that depicts the bioconvection flow of cross nanofluid with a magnetic dipole subjected to a cylindrical surface was developed and numerically solved. The model encountered nonlinear thermal radiation, activation energy, and second order slip. The flow equations were reduced and are presented in dimensionless forms, and they were solved numerically using the shooting technique, which is a built-in feature of MatLab. The model encountered symmetrical constraints for predicting velocity, temperature, concentration, and gyrotactic microorganism distribution and profiles. Moreover, the numerical values were computed for local Nusselt number, local Sherwood number, and motile density number against each physical parameter.

scholarly journals Bioconvection flow in accelerated couple stress nanoparticles with activation energy: bio-fuel applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sami Ullah Khan ◽  
Kamel Al-Khaled ◽  
A. Aldabesh ◽  
Muhammad Awais ◽  
Iskander Tlili
Keyword(s):  
Activation Energy ◽  
Couple Stress ◽  
Fluid Model ◽  
Flow Characteristics ◽  
Periodic Oscillation ◽  
Buongiorno’S Model ◽  
Nanoparticles Concentration ◽  
Flow Domain ◽  
Gyrotactic Microorganism ◽  
Accelerated Flow

AbstractOn the account of significance of bioconvection in biotechnology and several biological systems, valuable contributions have been performed by scientists in current decade. In current framework, a theoretical bioconvection model is constituted to examine the analyzed the thermally developed magnetized couple stress nanoparticles flow by involving narrative flow characteristics namely activation energy, chemical reaction and radiation features. The accelerated flow is organized on the periodically porous stretched configuration. The heat performances are evaluated via famous Buongiorno’s model which successfully reflects the important features of thermophoretic and Brownian motion. The composed fluid model is based on the governing equations of momentum, energy, nanoparticles concentration and motile microorganisms. The dimensionless problem has been solved analytically via homotopic procedure where the convergence of results is carefully examined. The interesting graphical description for the distribution of velocity, heat transfer of nanoparticles, concentration pattern and gyrotactic microorganism significance are presented with relevant physical significance. The variation in wall shear stress is also graphically underlined which shows an interesting periodic oscillation near the flow domain. The numerical interpretation for examining the heat mass and motile density transfer rate is presented in tubular form.

Significance of Activation Energy and Effective Prandtl Number in Accelerated Flow of Jeffrey Nanoparticles With Gyrotactic Microorganisms

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
Sami Ullah Khan ◽  
Iskander Tlili
Keyword(s):  
Activation Energy ◽  
Prandtl Number ◽  
Thermal Radiation ◽  
Flow Problem ◽  
Skin Friction Coefficient ◽  
Deborah Number ◽  
Flow Parameters ◽  
Gyrotactic Microorganism ◽  
The Impact ◽  
Buoyancy Ratio

Abstract This research addresses the interesting rheological features of Jeffrey nanofluid containing gyrotactic microorganism over an accelerated configuration. The additional consequences of activation energy and thermal radiation are also encountered in the current flow problem. The characteristics of nanofluid is utilized by using Buongiorno’s nanofluid model, while the phenomenon of bioconvection is evaluated by Kuznestov and Nield model. Unlike traditional attempts, the analysis for thermal radiation is performed by using “one parametric approach” by expressing the Prandtl number and thermal radiation parameter in combined form, namely, effective Prandtl number. The governing equations reflecting the flow problem are analytically treated with the help of homotopic algorithm. The impact of flow parameters is graphically elaborated with relevant physical significance. Further, the numerical expressions for effective local Nusselt number, local Sherwood number, and motile density number with variation of flow parameters in articulated tabular form. It is observed that magnitude of skin friction coefficient oscillates periodically with time and magnitude of oscillation increases with increment of Deborah number and mixed convection constant. It is further emphasized that the temperature distribution is enhanced with buoyancy ratio constant and bioconvection Rayleigh number. The microorganism distribution increases with buoyancy ratio constant but reverse trend has been examined for Peclet number. The observations from the reported problem can be more effective for the development of bifurcation processes, biofuels, enzymes, etc.

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