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A Mathematical Model to Prediction of the Formation of Microporsities in Aluminium Alloy Cast Parts
, M.Sc. Thesis Sharif University of Technology ; Varahram, Naser (Supervisor) ; Davami, Parviz (Supervisor)
Abstract
Today, application of aluminium alloys in industries is developing. And this is because of some specification of these alloys like high proportion of the Strength per weight. One of the most useful alloys of this alloy group is A356 alloy that contain 7 % Silicon and 0.4 Percent of magnesium, this alloy because of cast ability, heat treat ability specification is use developing in air and automotive industries. But usage of this alloys combined with some difficulties like low fluidity and formation of shrinkage and gas porosities in this alloys. In present work with programmer software Visual Fortran, based on Finite difference method, a simulation model has been developed, can solve heat...
Theoretical Study of Segregation of Particles in Gas-Fluidized Bed
, M.Sc. Thesis Sharif University of Technology ; Molaei Dehkordi, Asghar (Supervisor) ; Safe Kordi, Ali Akbar (Supervisor)
Abstract
In this work, the segregation of solids in 2D gas-solid fluidized beds has been investigated carefully doing DPM approach. In this regard, various types of mixing index reported in the literature were need. Lacey index was chosen to study to study the segregation for different conditions. Effects of jetsam concentration, bed aspect ratio, solids density, restitution coefficient, initial arrangement and operation pressure and temperature were investigated. It was found that for beds with the mixed initial conditions, with an increase in the superficial gas velocity, the mixing index decreases and then increases. In addition, the mixing index increases with an increase in the jetsam...
Modeling and Simulation of Micromixing Phenomenon in a New Double-Spinning-Disc Reactor
, M.Sc. Thesis Sharif University of Technology ; Molaei Dehkordi, Asghar (Supervisor)
Abstract
Mixing efficiency is an important performance indicator in many chemical reactors. In the present study, using a computational fluid dynamics model, the quality of micromixing in a double-disk-spinning reactor with the ability to rotate both disks using a fast iodide-iodate competitive reaction has been investigated. The purpose of this study was to investigate the effect of operational parameters such as the speed and direction of rotation of disks, radius and number of entry points of one feed, distance between disks, volumetric flow of feed, feed inlet nozzle diameter and acid concentration (H+) on quality of micromixing. The simulation results show that by increasing the rotation speed...