13595

12644

كارشناسي ارشد

مكانيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مكانيك

1397

سيزده، ۷۳ص.: مصور، جدول، نمودار

محسن ثقفيان

ابراهيم شيراني

علي اكبر عالم رجبي، مهدي نيلي احمدآبادي

1397/03/13

كتابنامه

مكانيك

مهندسي مكانيك

ID12644

Numerical Study of continuum electroosmotic flow under external transverse electric and magnetic fields in three dimensional rectangular microchannel with various aspect ratio Abolfazl Moradmand abolfazl moradmand@me iut ac ir June 19 2018 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree Master of Science Language FarsiSupervisor Mohsen Saghafian Assoc Prof saghafian@cc iut ac ir AbstractIn the present thesis the flow through three dimensional micro channel under an axial electric field and Trans verse magnetic and electric fields with axial pressure gradient has studied numerically Governing equationswere solved steadily with respect to the non slip and Constant Heat flux condition on channel wall and fixedphysical properties by using discrete finite volume method and a numerical code Also the Poisson Boltzmannequation was used with regard to the Debye Huckel approximation for modeling the distribution of electricalpotential in the vicinity of the wall The results show that if there is an axial electric field the application ofthe lateral magnetic field will reduce the flow rate However if there is transverse and axial electric field thegradual increase of the lateral magnetic field to a certain value will increase the flow velocity through the duct but afterwards the increase in the magnetic field will reduce the flow rate The Hartmann number such asthis magnetic field is called the critical Hartmann number Therefore in the presence of axial and transverseelectric fields and lateral magnetic fields the maximum flow through the duct occurs for a critical Hartmannumber Also by increasing the pressure gradient within the microchannel with a square cross section duct thecritical Hartman number decreases and By increasing the Transverse electric field the sensitivity of the criticalHartman number to the gradient of pressure is reduced and its value ultimately leads to a specific number about4 5 In addition the results of the present study showed that the aspect ratio of microchannels is effective onthe critical Hartman number so that the decrease in the microchannel aspect ratio in a certain lateral electricfield increases the critical Hartman number Also in an lateral electric field for with an increasein Ha the value of the poiseuille number and Nusselt number will reduce Furthermore thevalue of the poiseuille number and Nusselt number will increase with increasing Hartmann number KeywordsElectro osmotic Flow Poisson Boltzmann Equation MHD Flow Critical Hartmann Number Aspect Ratio

محسن ثقفيان

ابراهيم شيراني

علي اكبر عالم رجبي، مهدي نيلي احمدآبادي