6007

5616

كارشناسي ارشد

مكانيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1389

يازده،139ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمود اشرفي زاده

ابراهيم شيراني

22/3/90

علي اكبر عالم رجبي، محمدرضا سليم پور

مهندسي مكانيك

ID5616

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Microscale simulation of fluid flow and heat transfer using lattice Boltzmann method in the transition regime and a new analytical solution for the slip flow regime Mehdi Shamshiri m shamshiri@me iut ac ir Date of Submission Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Mahmud Ashrafizaadeh mahmud@cc iut ac ir Advisor Ebrahim Shirani eshirani@cc iut ac ir Abstract The main objective of the present thesis is to numerically and analytically investigate the flow and heat transfer phenomena in microscales Hence the content of this study is divided into the following two major sections In the first section which is related to the numerical study the lattice Boltzmann method LBM is employed to simulate flow and heat transfer processes in microscales Since common standard LB models are unable to capture the main features of the so called Knudsen layer in this study a correction wall function technique has been employed to enhance the capability of the already mentioned mesoscopic approach in dealing with this kinetic boundary layer It is shown that such an implementation leads to remarkable improvements in simulating momentum and energy transport phenomena in microscale rarefied gaseous flows especially in the transition flow regime without imposing considerable extra computational costs to the solution procedure In the second section which is related to the analytical study an original attempt has been made to present first and second law analysis of a rarefied gaseous flow confined between two concentrically rotating cylinders throughout the entire slip flow regime The incompressible Navier Stokes Fourier NSF equations including viscous dissipation effects in the cylindrical polar coordinate reference frame are analytically solved subject to the so called slip jump boundary conditions to obtain the associated velocity and temperature distributions The solutions are used to carry out a parametric study of rarefaction dissipation and rotation mode on the corresponding entropy generation characteristics Imposing two different thermal boundary conditions namely UHF and CWT B Cs three distinct thermal cases are constructed and then treated separately The interactive effects of parameters such as the Knudsen number the Brinkman number rotation mode and the aspect ratio of the annuli on the velocity and temperature distributions Nusselt number and heat fluxes at the walls have been studied Keywords Microscale flow and heat transfer Lattice Boltzmann method Transition flow regime Analytical solution First and second laws of thermodynamics Slip flow regime

محمود اشرفي زاده

ابراهيم شيراني

علي اكبر عالم رجبي، محمدرضا سليم پور