Enhance of heat transfer on unsteady Hiemenz flow of nanofluid over a porous wedge with heat source/sink due to solar energy radiation with variable stream condition

Abstract

Nanofluid-based direct solar receivers, where strongly absorb aQ4 selectiVely absorb incident radiation. nanoparticles in a liquid medium caa scatter and absorb solar Based on the pdiation and Brownian motion properties of radiation, have recently received interest to efficiently distribnanoparticle, the utilization of nanofluids in solar thermal ute and store the thermal energy. The objective of the present system becomes the new study hotspot. work is to investigate theoretically the unsteady homogeneous Solar energy is one of the best sources of renewable Hiemenz flow of an incompressible viscous nanofluid past a energy with minimal environmental impact, S h m a et al. porous wedge due to solar energy (incident radiation). The [I]. Power tower solar collectors could benefit from the conclusion is drawn that the temperature is s i~c a n t l y potential efficiency improvements that arise from using a a u e n c e d by magnetic strength, nanoparticle volume &tion, nanofluid as a working fluid. The basic concept of using convective radiation and porosity of the wedge sheet.particles to collect soIar energy was studied in the 1970s A4

Advances of Nanofluids in Solar Collectors - A Review of Numerical Studies

“…Mohamad et al [62] analyzed the influence of the copper nanoparticles in the presence of magnetic field on unsteady Hiemenz flow and heat transfer of incompressible Cunanofluid along a porous wedge sheet due to solar energy. The conclusion was drawn that the temperature is significantly influenced by magnetic strength, nanoparticle volume fraction, convective radiation and porosity of the wedge sheet.…”

Boundary layer flow over a moving plate in a flowing fluid considering non-linear radiations

“…Homotopy solutions for Blasius flow of second grade fluid in the presence of thermal radiation effects have been derived by Hayat et al (2009). Some recent studies pertaining to linear radiation heat transfer can be found in Bhattacharyya (2011), Nadeem and Haq (2012), Khan et al (2012), Motsumi and Makinde (2012), Hady et al (2012), Gireesha et al (2013), Mohamad et al (2013) and Antar et al (2014). Magyari (2010) indicated that linear radiation problem for flow past a flat plate can be simply reduced to re-scaling of Prandtl number by a factor involving radiation parameter.…”

Nonlinear Radiation Heat Transfer Effects in the Natural Convective Boundary Layer Flow of Nanofluid Past a Vertical Plate: A Numerical Study

“…(6) results in a highly nonlinear energy equation in and it is difficult to obtain its solution. However, researchers have solved this problem in past by assuming small temperature differences within the flow (see [39] – [49] ). In this situation, Rosseland formula can be linearized about ambient temperature .…”

“…Effect of incident radiation due to solar energy in an incompressible flow of nanofluid has been presented by Kandasamy et al [48]. Heat transfer enhancement in the unsteady Hiemenz flow of nanofluid past a wedge has been discussed by Mohamad et al [49]. The above mentioned studies were confined to the linear radiative heat transfer effects which are only valid for small temperature differences.…”