9275

8576

كارشناسي ارشد

مكانيك-تبديل انرژي

اصفهان:دانشگاه صنعتي اصفهان، دانشكده مكانيك

1393

چهارده،84ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

احمد صابونچي

احمدرضا پيشه ور

28/8/93

محسن دوازده امامي، علي اكبر عالم رجبي

مهندسي مكانيك

ID8576

چكيده در ين پايان نامه به آناليز حر رتي يك عمليات حر رتي لقايي ثابت غير متحرك پرد خته شده ست ين مسئله به صورت جفت شده لكترومغناطيسي حر رتي غير خطي و گذر با يك كويل لقايي ثابت كه به عنو ن منبع حر رتي ثابت عمل ميكند به كمك روش جز محدود بررسي شده ست يك ستو نه توخالي عمودي با يك كويل ثابت بر روي آن در مدت زمان مشخصي ۷ ثانيه گرم ميشود تاثير ت جابجايي آز د با هو ي طر ف ستو نه بر روي هر دو سطوح د خلي و خارجي ستو نه در نظر گرفته شده ست همچنين تاثيير ت تشعشع سطح خارجي با محيط پير مون نيز در نظر گرفته شده ست سپس ين فر يند بر ي جسم جامدي با هندسه ستو نه توپر و مخروط بررسي شده ست در ين فر يند بتد ميد ن مغناطيسي توسط حل معادلات لكترومغناطيسي ماكسول شبيه سازي شده ست و منبع حر رتي ثابت پس ز حل ين معادلات بدست آمده ست سپس معادله نرژي در درون جسم جامد معادله هد يت نرژي بر ي بدست آوردن توزيع دماي يجاد شده در ستو نه توسط منبع حر رتي ثابت با در نظر گرفتن نتقال حر رت در مرزها در زمانهاي مختلف به كمك روش جز محدودحل شده ست به عبارت ديگر توزيع دماي ستو نه در هر زمان توسط حل مزدوج معادلات هد يت درون ستو نه با معادلات جابجايي آز د با هو ي مجاور ستو نه و معادلات تشعشع سطح خارجي ستو نه بدست آمده ست در ين مسئله خو ص مربوط به ماده سازنده جسم جامد به دما و بسته بوده و با تغيير دما در زمانهاي مختلف ين خو ص تغيير كرده و مجدد محاسبه شده ند بنابر ين ميتو ن گفت حل ين مسئله مستلزم حل سه معادله جفت شده شامل معادلات لكترومغناطيسي هد يت حر رتي و جابجايي آز د ميباشد در نهايت صحت نتايج بدست آمده با مقايسه با نتايج حاصل ز حل تحليلي با ستفاده ز روش تابع گرين بر ي يك مرحله مكاني ثابت بررسي شده ست كلمات كل دي انتقال حرارت گرما ش القا ي ثابت حل عددي

85 Thermal Analysis of Stationary Inductive Heating Effect of Geometry and Frequency Masoud Ghane m ghane@me iut ac ir Date of Submission 2014 09 20 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Ahmad saboonchi ahmadsab@cc iut ac irAbstractIn this thesis the stationary thermal analysis of a heating induction operation was studied This was a coupledelectromagnetic thermal nonlinear and transient induction coil act as a heat source which has beeninvestigated through a finite element method A vertical hollow cylinder with a stationary coil on the cylinderwas heated at a certain time Impact of natural convection with air around the cylinders on both inner and outercylindrical surfaces was considered Also impact of external radiation levels was measured in the intendedenvironment Then the process was investigated for a solid cylindrical billet and cones In this process first magnetic field has been simulated by solving the Maxwell equations and the constant heatsource was obtained after solving these equations Then the energy equation inside solid energy conductionequation was solved to obtain the temperature distribution in the cylinder caused by the constant heat source taking into account the heat transfer boundary at different times using the finite components In other words the temperature distribution within the cylinder at any time will be achieved by solving the coupled equationsof conduction equation in solid body natural convection equations with surrounding air and the equations ofradiation from the outer surface of a cylindrical drum In this case the cylinder material properties were temperature dependent and with thermal changes at differenttimes these properties were changed and re calculated Thus solving the problem requires solving threecoupled equations including electromagnetic equations thermal conductivity and natural convection The obtained results from this study shows that the outer temperature of solid body against induction heatingin 7 seconds changes from 200 celsius up to 900 celsius This escalation is dependent to inductor frequencyand thickness of the solid body Enlargement of the solid body thickness was resulted to decrease maximumtemperature outer of surface that was exposed to induction heating Increase in frequency has been caused toincrease in temperature growth rate and development of maximum temperature The temperature of thosepoints of solid body that were not exposed to the induction heating were increased in a lower rate At the endit has a significant difference with those points that were exposed to the electro magnetic induction The radiusdifference of temperature distribution in thickness of solid body was low because of thinness of the standardpipe and higher rate of conductivity coefficient with extension of solution time this difference approaches tobe zero Eventually the accuracy of results was obtained by comparing the results of the analytical solution using theGreen s function for a stationary location phase in isolated boundary Key words Heat Transferring Stationary Inductive Heating Numerical Solution

احمد صابونچي

احمدرضا پيشه ور

محسن دوازده امامي، علي اكبر عالم رجبي