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Received: 11 October 2018 Accepted: 28 February 2019 The present article numerically investigates the effects of natural convection of Cu-water nanofluid in a two-dimensional rectotrapezoidal enclosure used in application of absorber plate fin. The inclination angle of rectotrapezoidal enclosure, region  is chosen as 60o.The left and right vertical walls of the enclosure are maintained at a local cold temperature Tc (heat sink) while the bottom wall is kept at a high temperature of Th, respectively. The top wall of the enclosure is adiabatic. After non-dimensionalising the necessary governing controlling equations, the finite element strategy is adopted for solving the same. We present here the results in form of stream line contour, isotherm contours, local and average heat transfer rate (Nu ) adopting a specific gamut of Rayleigh numbers i.e 10Ra10. The solid volume fraction range of Cu-water nanoparticles adopted for the present study is (0  φ  0.1). The Prandtl number of the numerical simulation is maintained at 6.2.From the results it is observed that the higher stream line intensity is reported at a higher Rayleigh number for higher values of φ and also it is found that with an increase of solid volume fraction φ, of copper water nanoparticles, average heat transfer

mathematical modelling and engineering problems/mathematical modelling of engineering problems

A numerical investigation of natural convection heat transfer of copper-water nanofluids in a rectotrapezoidal enclosure heated uniformly from the bottom wall