July 2012 Issue Vol.2 No.7
Abstract: Nanofluids are engineered colloids made of a base fluid and nanoparticles (1-100 nm). This article presents the numerical study of a natural convection flow and heat transfer characteristics in a vertical channel filled with a nanofluid. The transport equations along with the boundary conditions are first cast into a dimensionless form and then the resulting equations are solved numerically by finite difference method. Also, we compared the numerical results using semi-numerical-analytical method known as Differential Transformation Method (DTM), and regular perturbation method (PM). The influence of pertinent parameters such as Grashof number, Brinkman number and the nanoparticle volume fraction on the velocity and temperature fields are shown graphically. Results for the skin friction and heat transfer rate for various types of nanoparticles such as Ag-water, Cu-water, SiO2-water, Diamond-water and TiO2-water are also tabulated. The results obtained for the flow and heat transfer characteristics reveal many interesting behaviors that warrant further study on nanofluids in a vertical channel.
Keywords: Natural convection, nanofluid, Differential transformation method, Finite difference method, perturbation method.
An Experimental Study of Effect of Welding Parameters on T- Weld Joint in TIG Welding of SS 316L and Development of its Microstructure and Mechanical propertiesRupinderpreet Singh#1, Geetesh Goga*2, Lakhwinder Singh!3
1,2,3K.C.College of Engineering and I.T., Nawanshahr, Punjab, India
Abstract: The microstructure and tensile strength of T weld joint of stainless steel 316 material in TIG (tungsten inert gas) equipment was analysed by varying shielding gas ( argon gas and Carbon dioxide) and voltage. Vastly different microstructures are formed in 316L stainless steel joints welded with Argon and Carbon dioxide and by varying voltage, respectively. Different microstructures, yield strength, tensile strength and weld bead hardness are tested in my project. Effect of varying voltage and shielding gas on stainless steel 316 material T-weld joint are analysed.
Keywords: TIG Welding, Argon, CO2, Operating Variables, Microstructures