Abstract This work investigates heat transfer and entropy generation of a turbulent flow an Al 2 O 3 –Cu/water hybrid nanofluid in plain tube (PT) with classical (TPT) elliptical‑cut twisted tape (TECT) inserts. The pressure drop are investigated numerically at Re (7000–15,000), mass concentration (1–4%), the inlet temperature fluid (300 K). Further, total Bejan number examined = 7000 4%. obtai...

In this paper a new equation for calculating the nanofluid viscosity by considering the Brownian motion of nanoparticles is introduced. The relative velocity between the base fluid and nanoparticles has been taken into account. This equation presents the nanofluid viscosity as a function of the temperature, the mean nanoparticle diameter, the nanoparticle volume fraction, the nanoparticle densi...

nanofluid is a new class of heat transfer fluids engineered by dispersing metallic or non-metallic nanoparticles with a typical size of less than 100 nm in the conventional heat transfer fluids.this article aims to investigate the overall and convection heat transfer coefficient and nusselt number of al2o3-water nanofluid flowing in a horizontal double pipe heat exchanger under turbulent flow (...

In this paper, nanofluid heat transfer in a microchannel has been studied using homogenous and Buongiorno’s models, compared with Eulerian-Lagrangian model. The base fluid is water the particles are Al2O3 Cu diameter of 100nm. volume fraction up to 2% Reynolds number range 250-1000. governing equations including continuity, momentum energy, have solved control method (SIMPLE). results show that...

the aim of the present paper is to study the cu-water nanofluid flow and heat transfer characteristics of a stretching permeable cylinder. thermal radiation effect is considered in energy equation. the governing partial differential equations with the corresponding boundary conditions are reduced to a set of ordinary differential equations with the appropriate boundary conditions using similari...

sometimes the need for non-circular ducts arises in many heat transfer applications because of lower pressure drop of non-circular cross section such as square duct compared to circular tube, particularly in compact heat. but square cross section has poor heat transfer performance and it is expected that using a nanofluid as a new heat transfer media may improve the heat transfer performance of...