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flow-of-fluids
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Study of mixed-convection heat transfer from an impinging jet to a solid wall using a finite-element method - Application to cooktop modeling
, Article Numerical Heat Transfer, Part B: Fundamentals ; Volume 46, Issue 4 , 2004 , Pages 387-397 ; 10407790 (ISSN) ; Kazemzadeh Hannani, S ; Farhanieh, B ; Sharif University of Technology
2004
Abstract
The mixed-convection flow from a hot vertical impinging jet on a colder horizontal disc has been studied. The geometry is analogous to a conventional burning gas cooktop. A numerical simulation of the system has been carried out using the finite-element method to study the dependence of fluid flow and heat transfer on the geometric, thermal, and fluid flow parameters. Results show that heat transfer efficiency versus several parameters such as inlet velocity magnitude and flue gas temperature has an optimum value, in which heat transfer efficiency is maximum. With thermal conductivity of the solid wall, velocity angle, and solid wall diameter heat transfer efficiency has increasing behavior....
Modelling of foam degradation in lost foam casting process
, Article Journal of Materials Science ; Volume 39, Issue 14 , 2004 , Pages 4593-4603 ; 00222461 (ISSN) ; Silk, J. R ; Davami, P ; Sharif University of Technology
2004
Abstract
In this investigation a new model was developed to calculate gas pressure at the melt/foam interface (Gap) resulting from foam degradation during mould filling in the lost foam casting (LFC) process. Different aspects of the process, such as foam degradation, gas elimination, transient mass, heat transfer, and permeability of the refractory coating were incorporated into this model. A computational fluid dynamic (CFD) code was developed based on the numerical technique of the Solution Algorithm-Volume of Fluid (SOLA-VOF) utilizing model, for the simulation and prediction of the fluid flow in the LFC process. In order to verify the computational results of the simulation, a thin plate of grey...
Modelling the flow behaviour of steel under non-isothermal conditions
, Article Materials Science and Technology ; Volume 19, Issue 8 , 2003 , Pages 1065-1069 ; 02670836 (ISSN) ; Zebarjad, S. M ; Sharif University of Technology
2003
Abstract
A mathematical model is proposed for evaluating flow behaviour under hot deformation conditions. The effects of dynamic recovery and recrystallisation as well as temperature and strain rate variations are considered in the model by means of Bergstrom's approach and the additivity rule for strain. To verify the model, hot compression tests for three grades of steel together with upsetting experiments are carried out. Comparison between experimental and theoretical results confirms the reliability of the model. © 2003 IoM Communications Ltd. Published by Maney for the Institute of Materials, Minerals and Mining