Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Mixed convective boundary layer flow over a vertical wedge embedded in a porous medium saturated with a nanofluid: Natural Convection Dominated Regime | Gorla et al. Nanoscale Research Letters 2011 6 207 http content 6 1 207 o Nanoscale Research Letters a SpringerOpen Journal NANO IDEA Open Access Mixed convective boundary layer flow over a vertical wedge embedded in a porous medium saturated with a nanofluid Natural Convection Dominated Regime Rama Subba Reddy Gorla1 Ali Jawad Chamkha2 Ahmed Mohamed Rashad3 4 Abstract A boundary layer analysis is presented for the mixed convection past a vertical wedge in a porous medium saturated with a nano fluid. The governing partial differential equations are transformed into a set of non-similar equations and solved numerically by an efficient implicit iterative finite-difference method. A parametric study illustrating the influence of various physical parameters is performed. Numerical results for the velocity temperature and nanoparticles volume fraction profiles as well as the friction factor surface heat and mass transfer rates have been presented for parametric variations of the buoyancy ratio parameter Nr Brownian motion parameter Nb thermophoresis parameter Nt and Lewis number Le. The dependency of the friction factor surface heat transfer rate Nusselt number and mass transfer rate Sherwood number on these parameters has been discussed. Introduction Nanofluids are prepared by dispersing solid nanoparticles in fluids such as water oil or ethylene glycol. These fluids represent an innovative way to increase thermal conductivity and therefore heat transfer. Unlike heat transfer in conventional fluids the exceptionally high thermal conductivity of nanofluids provides for enhanced heat transfer rates a unique feature of nanofluids. Advances in device miniaturization have necessitated heat transfer systems that are small in size light mass and high-performance. Several authors have tried to establish convective transport models for nanofluids. Nanofluid is a two-phase mixture in which the solid phase c onsists of nano-sized particles. In view of the
