Abstract
Solar thermal collectors distribute, capture, and transform the solar energy into a solar thermal concentration device. The present paper provides a mathematical model for analyzing the flow characteristics and transport of heat to solar collectors (SCs) from non-Newtonian nanofluids. The non-Newtonian power-law scheme is considered for the nanofluid through partial slip constraints at the boundary of a porous flat surface. The nanofluid is assumed to differ in viscosity and thermal conductivity linearly with temperature changes and the magnetic field is appliqued to the stream in the transverse direction. The method of similarity conversion is used to convert the governing structure of partial differential formulas into the system of ordinary differential ones. Using the Keller box procedure, the outcoming ordinary differential formulas along with partial slip constraints are numerically resolved. A discussion on the flowing and heat transport characteristics of nanofluid influenced by power law index, Joule heating parameter, MHD parameter and slip parameters are included from a physical point of view. Comparison of temperature profiles showed a marked temperature increase in the boundary layer due to Joule heating. The thickness of the motion boundary-layer is minimized and the transport of heat through boundary-layer is improved with the partial slip velocity and magnetic parameters rising. Finally, With an increase in the Eckert number, the distribution of temperature within boundary layer is increased.
Highlights
Energy is an essential commodity that commands the functioning of our modern world
Numerical computations have been performed to investigate the effects of the parameters: power law n, viscosity A, thermal conductivity ε, solid concentration φ, magnetic parameter M, slip velocity σ suction/injection S and thermal slip Δ on velocity f 0(η) and temperature θ(η) outlines of Cu–H2O nano-fluid
The numeric results for differences in f 0(η) and θ(η) distributions are displayed in the form of graphs to show the useful relationship between the parameters
Summary
Non-renewable sources of energy are being depleted faster than ever it’s crucial for us to look for alternative and renewable sources of energy. About 148×106 km from the earth lies a star that emits so much energy that every hour 430×1015 kilojoules of its energy reach the earth that star is called the sun it’s abundantly clear that energy from the sun is more than enough to satisfy our energy demands. The question is how to collect solar energy. Nowadays Harnessing the energy of the sun is done through two main methods photovoltaic and solar thermal collector the latter being preferable as it is cheaper and greatly more efficient Currently most of the research done on SCs is being concentrated on increasing their maximum thermal efficiency which is limited by the thermophysical of the absorber fluid. When Choi [1] engineered the nanofluid and highlighted their exceptional properties its was no surprise that researchers started using them to boost the energy SCs competence
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