پديد آورنده :
آقاجاني گيلده، اميد
عنوان :
بررسي عددي هيدروديناميك و انتقال حرارت عبور تك حباب هوا از جريان مايع داخل ميكرو كانال
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
پديده هاي انتقال
محل تحصيل :
اصفهان : دانشگاه صنعتي اصفهان
صفحه شمار :
سيزده، 57ص.: مصور (رنگي)، جدول، نمودار
استاد راهنما :
محسن نصر اصفهاني
توصيفگر ها :
ميكرو كانال , جريان دوفازي , حباب تيلور , انتقال گرما , فلوئنت
استاد داور :
مسعود حق شناس فرد، احمدرضا پيشه ور
تاريخ ورود اطلاعات :
1398/05/01
رشته تحصيلي :
مهندسي شيمي
تاريخ ويرايش اطلاعات :
1398/05/02
چكيده انگليسي :
Numerical Study of Hydrodynamics and Heat Transfer of Air Bubble passing from Fluid Flow inside Microchannel Omid Aghajani Gildeh o aghajani@ce iut ac ir Date of Submission June 30 2019 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor M Nasr Esfahany Professor mnasr@cc iut ac irAbstract The Taylor flow has been taken into consideration in recent decades Many experiments have been done in this regard although due to the difficulty of measuring it is not possible to study some of the parameters in laboratory So a numericalinvestigation can be useful In this study the hydrodynamic behavior and heat transfer of a Taylor air bubble flowingthrough a liquid in a circular microchannel with a diameter of 0 5 mm and a length of 10 mm in axial symmetry wassimulated by Fluent software Water and ethanol were used as liquid in the microchannel The effect of fluid type velocityand wall heat flux on the wall were investigated The results show that the type of fluid which changes the properties andvelocity which are effective parameters in the capillary number and Reynolds number change the shape of the bubbles Increasing the capillary and Reynolds number can increas the thickness of the liquid film around the bubble and form thewave at the end of the bubble The liquid film thickness can directly affect the heat transfer around the bubble so that thelower the thickness the heat transfer from the channel wall to the liquid surface occurs with lower resistance Simulationsalso showed that there are rotational flows inside and around the bubble The presence of these currents in front of thebubble causes heat transfer from the wall to the microchannel center Such flows in the liquid film also increase the shearstress As a result Nusselt number increases with the velocity and heat flux on the wall Due to the fact that the velocityincreases the thickness of the liquid film the local Nusselt number in the liquid film decreases Keyword Microchannel Two Phase Flow Taylor Bubble Heat Transfer Fluent
استاد راهنما :
محسن نصر اصفهاني
استاد داور :
مسعود حق شناس فرد، احمدرضا پيشه ور
