Papers Posted on - Sep / 2019


Author Name Bharatbhushan S. Kale
PDF Download PDF
DOI http://dx.doi.org/10.11127/ijammc 2019.09.01
Paper Title Experimental Modeling Of Meso Fractals Generated From Non Newtonian Fluid From Lifting Plate Hele- Shaw Cell
Abstract
Various methods are existing to fabricate the meso and micro size fractals in the field of engineering. Viscous fingering also termed as Saffman Taylor instabilities is used in this research to get meso and micro fractals. Viscous fingering is obtained by allowing low viscous fluid to penetrate into high viscous fluid which is placed between two flat parallel plates separated by a small gap while lifting one plate in the z-direction away from another plate. The fluid flow between these two flat parallel plates is known as Hele-Shaw flow. The physics of fluid flow in Hele-Shaw cell & controlling factors for the development of viscous fingering are studied in this paper. The various controlling factors identified are the velocity of moving the plate, a gap between the plates, fluid quantity and fluid property: kinematic viscosity. A number of experiments were conducted with the identified controlling factor and the effect of these parameters on the shielding distance and radius of the circular plane were studied and analyzed. The mathematical model is developed using mathematics and fluid flow concept, which is responsible for the formation of micro fractals under various levels of control parameters. This mathematical model will help to find different attributes associated with micro fractals and to predict the pattern of viscous fingering. The fluid quantity and Reynolds number are supervising factors of a model.
Keywords
Saffman Taylor Instability; Hele Shaw flow; micro fractals; Mathematical modelling
Author Name D.Srinivasa Rao
PDF Download PDF
DOI http://dx.doi.org/10.11127/ijammc 2019.09.02
Paper Title Modelling of a Parallel and Counter Flow Heat Exchanger
Abstract
Heat exchangers are one of the important devices in cooling and heating processes in factories, industries, transport and other applications. They are found in large constructions to support cooling processes such as in fossil fuel power plants. A double pipe heat exchanger comprising of both parallel and counter flow always comprise of very high cost ranging around 50,000 rupees and more in the market as it is fabricated with highly expensive materials consisting of highly heat resisting steel alloys. Since vapour state working fluid is not required by the labs, high heat strength materials would not be optimal. Fabricating the double pipe heat exchanger with minimum cost is the main objective of the present work. It has been fabricated with optimal cost by making modifications in the design by replacing the outer pipe with optimal material having the least cost and best quality which is made suitable for the purpose of the lab.
Keywords
Double pipe heat exchanger, Copper pipe, CPVC Pipe, Overall heat transfer coefficient, heat transfer rate, parallel flow, counter flow, thermal conductivity
Author Name Mehdi Zaheri
PDF Download PDF
DOI http://dx.doi.org/10.11127/ijammc 2019.09.03
Paper Title Evaluation of Axial Bearing Properties Bronze C93200-Steel St37
Abstract
In this paper, the goal is to study the properties of axial bearing C93200-St37 that has been produced through the casting using pre-mould. In order to bond, the pre-mould are cleaned chemically. Then, the bronze C93200 is melted and then solidified in St37 pre-mould. The hardness has been measured by using the Vickers test triple; the Bond’s strength has been measured by using the shear test triple; wear resistance has been measured by using pin-on-disc machine and corrosion resistance has been measured by using salt spray method. The results indicate that the minimum shear strength of bond is at least 94.8 MPa; hardness of bronze, bond and St37 are 80, 100 and 120 HV, respectively; wear rate of bronze is 100% with applying stress of 7.9 MPa and without lubrication by lose weights; and corrosion rate of bronze is 0.86% by lose weights.
Keywords
Wear rate; Corrosion resistance; Hardness; Pin-on-disc; Salt spray; Bond’s strength
Author Name Hadi Nazarian
PDF Download PDF
DOI http://dx.doi.org/10.11127/ijammc 2019.09.04
Paper Title Effect of Sub-Zero Treatment on Tensile Properties of Aluminum 2024
Abstract
Challenge of change of alloy properties during service life of extra safety parts was always considered by industrialists and consequently researchers. Fuselage and wings of airplane repeatedly in ascent and descent is affected respectively by cooling to -55 0C and heating to room temperature. Hence, the effect of above temperature changes on tensile properties is unknown. In this study in laboratory, the situation of airplane body is tried to simulate and then the changes of microstructure and consequently the changes of tensile properties and hardness after holding for 10 and 4 hours were studied respectively in temperature -600C and -1960C. Results showed that by using of sub-zero treatment, hardness is without change but tensileproperties are increased to control sample and when the cooling rate was low (≈1 degree per minute), more improvement will be achieved in tensile properties
Keywords
Population density of particles, Liquid nitrogen, Sub-Zero treatment Toughness