For a solar thermal system, increasing the heat transfer area can increase the output temperature of the system. However, this approach leads to a bigger and bulkier collector. It will then increase the cost and energy needed to manufacture the solar collector. This study is carried out to estimate the potential to design a smaller solar collector that can produce the same desired output temper...

Nanofluids can afford excellent thermal performance and have a major role in energy conservation aspect. In this paper, a sensitivity analysis has been performed by using response surface methodology to calculate the effects of nanoparticles on the entropy generation. For this purpose, the laminar forced convection of Al2O3-water nanofluid flow inside a channel is considered. The total entropy ...

In this investigation, the analysis of heat transfer coefficient a shell, helically coiled convergent-divergent tube exchanger has been carried out by utilizing Al2O3/water nanofluid. The nanofluid was prepared using two-stage technique with proportions 0.1vol%, 0.3vol%, and 0.5vol%. inner coefficient, overall Nusselt number were analyzed it found that is increased, increase dean particle volum...

The boundary layer flow over a stretching/shrinking cylinder in hybrid nanofluid with the effects of suction, partial slip and convective condition is studied. Hybrid nanoparticles Al2O3 TiO2 water as based fluid are considered study. differential equations transformed to ordinary by employing similarity variables. numerical results obtained using bvp4c solver MATLAB software. influence volume ...

In this work, a Homotopy Perturbation Solution of magnetohydrodynamic (MHD) model of boundary-layer equations for an electrically conducting Nanofluid flow bounded by an infinite parallel vertical permeable plates is to be introduced. This model is applied to study the mass and heat transfer of an unsteady nanofluid, incompressible flow with suction, internal heat generation, Hall Effect and Ch...

Abstract—Heat transfer due to forced convection of copper water based nanofluid has been predicted by Artificial Neural network (ANN). The present nanofluid is formed by mixing copper nanoparticles in water and the volume fractions are considered here are 0% to 15% and the Reynolds number are kept constant at 100. The back propagation algorithm is used to train the network. The present ANN is t...

In this study, the effects of microchannel number, volume concentration, Reynolds and nanofluid type on heat transfer flow characteristics in sink consisting trapezoidal microchannels are investigated numerically. Governing equations solved by assuming three-dimensional, incompressible, steady laminar flow. The channel material is chosen as copper, a constant flux boundary condition defined upp...

This paper reports experimental investigations on the droplet formation of deionized water and a nanofluid in a heat-induced microfluidic flow focusing device. Besides the effect of temperature, the effects of nanoparticle suspension (nanofluid), and the flow rate of aqueous fluid on the droplet formation and size manipulation were studied. At constant flow rates of the two liquids, three diffe...

Heat pipe solar collectors (HPSCs) are heat exchangers that carry based on the phase change of working fluid. It is aimed to increase operating temperature range by changing fluid in at low temperature. For this reason, it has become widespread use nanofluids obtained mixing nanosized metal oxides with base certain proportions order both thermal conductivity fluids and specific closures. The ma...

the abrasion is a significant issue, especially in machining of rigid steels. a functional and suitable approach for enhancing the heat transfer from machining area is using an intermediate fluid with higher heat transfer potential instead of common fluids. the objective of this experimental study is to discuss production, stability and thermal conductivity examination of water/graphene oxide n...