Volume 3, Issue 6, June 2021

Solving Natural Convection by Navier-Stokes Equation in a Closed Cavity using MATLAB

Shivani Srivastava; Ajay Trehan

International Research Journal on Advanced Science Hub, 2021, Volume 3, Issue 6, Pages 124-130
DOI: 10.47392/irjash.2021.151

The objective of this study was to analyze the heat transfer and fluid flow within a closed cavity, which usually enhance by application of Nanofluids. The movement of the Nanofluids within the enclosure were governed by Buoyancy force and Gravitational force. Different kinds of Nanofluids were employed for purpose of examining the motion of heat flow and the stream line formation, within the close cavity. The closed cavity considered for this study comprised of a flush mounted heater on the left wall, the right wall was maintained at a constant temperature throughout the investigation and the top & bottom wall were kept insulated. In this study, MATLAB was used for performing the simulation and solving the fundamentals of Computational Fluid Dynamics (CFD), namely the Energy equation and the Momentum equation. The analysis to estimate the heat transfer and fluid flow in a closed cavity by the use of different Nanofluids have been presented in terms of several parameters such as Rayleigh number, Nusselt number, Aspect ratio and Volume fraction respectively.

A Study of the Optimization and Characterization of Friction Stir Welded AA5083 and AA6082

MULLAIARASU R; Thilagham K. T; Noorullah D

International Research Journal on Advanced Science Hub, 2021, Volume 3, Issue 6, Pages 131-139
DOI: 10.47392/irjash.2021.152

The joining of dissimilar 6mm thickness plates of AA6082 & AA5083 was carried out using the friction stir welding (FSW) technique. The process parameters are optimized using Taguchi L9 orthogonal design of experiments. Where the rotational speed (600, 900, 1200 rpm), travel speed (60, 90, 120 mm/min), and tilt angle (0, 1, 2◦ ) were the parameters taken into consideration. The optimum process parameters were determined with the reference to tensile strength, yield stress, elongation of the joint. Friction stir welding of aluminum alloys has gained popularity in manufacturing industries such as shipbuilding, aircraft production, railways, and automotive. Effect of process parameters on tensile properties, microstructure, and hardness distribution of the welded joints were investigated.

A New Autism as The Next Pandemic: How Christian Education Eliminating Nomophobia

Sandy Ariawan; Sri Wahyuni; Roy Pieter

International Research Journal on Advanced Science Hub, 2021, Volume 3, Issue 6, Pages 140-144
DOI: 10.47392/irjash.2021.153

The world is grappling with the Covid-19 pandemic. This precarious situation forced adjustments in every aspect of human life, not least in the field of education. We were facing a twin pandemic, which is damaging to physical health as well as mental health. This study aimed to analyze the influence of fatherlessness on nomophobia among Christian students in Indonesia. This is a quantitative research with survey methods. All participants (200 students) completed a battery of questioannaires assessing predictor and outcome variables related to nomophobia The result of the analysis revealed that fatherlesness condition had a strong correlation with nomophobia, a new form of autism that will be the next pandemic. This can be eliminated by restoring parental function in the family.