8768

8129

كارشناسي ارشد

استخراج فلزات

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1392

سيزده،78ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مسعود پنجه پور، محمود مرآتيان اصفهاني

محسن دوازده امامي

3/2/93

مهدي احمديان، محمدرضا سليم پور

مهندسي مواد

ID8129

Numerical Simulation of Heat Transfer and and Fluid Flow in Metal Porous Media Zafari Mohammad m zafari@ma iut ac ir January 21 2014 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiDr Masoud Panjepour Assoc Prof Supervisor Email panjepour@cc iut ac irDr Mahmood Meratian Assoc Prof Supervisor Email meratian@cc iut ac irAbstractNowadays one of the biggest challenges in foams industries is designing based on the performance features Therefore simulation or exact solution of transport equations is the first step in designing the foams whichhas numerous difficulties due to structure complexity of the foams Hence most of the numerical studieswere performed on the ideal or unrealistic structure of the foams such as Kelvin model Using these simplemethods is due to the difficulties in creating the real structure of the foams and meshing of them Therefore inthis study simulation of hydrodynamic and thermal behavior of fluid on metallic foams with real structurewas surveyed using hexahedral computational grid For this purpose continuity heat and momentum transferequations for a fluid inside the porous media of the foam with 85 90 95 and 98 porosity percent weresolved by finite volume algorithm The results showed the linear and non linear term coefficients of the 2 31 10 4 1 21 10 3 dP u u 2 pressure gradient equation vary between and dx 228 3733 respectively Also conductive heat transfer has a great dependency to the thermalconductivity coefficient of the solid matrix On the other hand the heat in forced convection was transferredin a short length of the bed and after that the thermal equilibrium between fluid and the solid was established The curve of friction factor vs Reynolds number diagram showed that for Re 1 the flow is laminar Whilefor Re 1 the fluid has a transient behavior Meanwhile transient Reynolds number change with porosity byperforming a thermal gradient to the fluid Also based on the microscopic view a new correlation forNusselt number Nu using the geometric specification of the foams was developed In the microscopicview the limitation of previous models such as lack of attention to the geometry of the foam was eliminated On the other hand the injection of a particle in porous media and observation of its path was the basis oftortuosity survey According to the results the was decreased by increasing the porosity in the foam Also the is a mean value for traveled path by fluid related to the length of foam according to the directionof fluid flow and has different values in various directions which is due to the heterogeneous distribution ofthe pores in the foam Therefore this study can be brought up as a new field and method for designing thefoams for different application Keywords Foam Simulation Hexahedral Pressure gradient Nusselt number Tortuosity

مسعود پنجه پور، محمود مرآتيان اصفهاني

محسن دوازده امامي

مهدي احمديان، محمدرضا سليم پور