Active and passive controls of the Williamson stagnation nanofluid flow over a stretching/shrinking surface

A steady stagnation point flow of an incompressible Williamson nanofluid towards a horizontal linearly stretching/shrinking sheet with active and passive controls on the wall mass flux is numerically studied. The governing partial differential equations are reduced into a system of ordinary differen...

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Bibliographic Details
Published in:Neural computing & applications 2017-12, Vol.28 (Suppl 1), p.1023-1033
Main Authors: Halim, N. A., Sivasankaran, S., Noor, N. F. M.
Format: Article
Language:English
Subjects:
Active control
Artificial Intelligence
Coefficient of friction
Computational Biology/Bioinformatics
Computational fluid dynamics
Computational Science and Engineering
Computer Science
Concentration (composition)
Data Mining and Knowledge Discovery
Fluid flow
Friction
Image Processing and Computer Vision
Incompressible flow
Nanofluids
Nanoparticles
Ordinary differential equations
Original Article
Partial differential equations
Passive control
Probability and Statistics in Computer Science
Skin friction
Stagnation point
Stretching
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Summary:A steady stagnation point flow of an incompressible Williamson nanofluid towards a horizontal linearly stretching/shrinking sheet with active and passive controls on the wall mass flux is numerically studied. The governing partial differential equations are reduced into a system of ordinary differential equations using a similarity transformation and are solved using the bvp 4 c package in MATLAB. The velocity, temperature and nanoparticle volume fraction profiles together with the reduced skin friction coefficient, reduced Nusselt number and reduced Sherwood number are graphically presented to visualize the effects of parameters involved in the study. Results show that temperature and nanoparticle volume fraction are decreasing functions of the stagnation parameter, r . It is also found that the diffusivity ratio N bt and Lewis number Le have almost negligible effects on heat transfer rate in passive control. Increasing value of Williamson parameter λ will increase the skin friction in both stretching and shrinking surfaces.
ISSN:0941-0643
1433-3058
DOI:10.1007/s00521-016-2380-y