پديد آورنده :
علي زاده، مهدي
عنوان :
مدلسازي اختلاط بين ذوب هاي متوالي به هنگام تغيير نوع فولاد در فرايند ريخته گري مداوم تختال
محل تحصيل :
اصفهان : دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
هجده، 176، [II]ص: مصور، جدول، نمودار
يادداشت :
ص. ع به: انگليسي و فارسي
استاد راهنما :
حسين ادريس، علي شفيعي
استاد مشاور :
احمد رضا پيشه ور، غلامرضا آريانپور
توصيفگر ها :
تانديش , فلوئنت
تاريخ نمايه سازي :
29/2/87
استاد داور :
محمدرضا ابوطالبي، حسين سيدين، محمود مرآتيان، احمد كرمانپور
كد ايرانداك :
ID196 دكتري
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
Abstract Sometimes it is necessary to change the steel grade while the changing the ladle in thesteel continuous casting process The continuous casting mechanism causes mixing the twosteel melts with different chemical compositions Steel producers need to know the nearlyaccurate place of the mixed slab and the length of the mixed slab should be minimizingfrom the economical view point In this study the steel grade transition during the ladlechange in a continuous casting process is simulated by presenting a new mathematicalmodel First the mixing process for both isothermal and non isotherm tundish areinvestigated by residence time distribution models These models led to a set of ordinarydifferential equations that were solved with a four order Runge Kutta algorithm by thefinite difference numerical method Steady state water modeling was carried out underisothermal and non isothermal conditions Experimental data obtained from the watermodel were used to calibrate the mixing models Then heat transfer mechanisms andsolidification process are simulated for a continuous casting machine and the geometricshape of the liquid pool is predicted considering different conditions This model involvesa two dimensional 2 D transient energy equation The governing equation was solvedusing QUICK algorithm by the finite volume procedure The modeling results wereverified by the measured slab surface temperatures and others researcher s results for thedifferent cooling regions of slab The mixing process in the liquid pool of strand is alsoinvestigated by a mixing model Then mixing in the strand is investigated by residencetime distribution models and the governing equations solved by numerical methods Finally when the solidification process in the strand is completed the variations ofchemical composition in the final product are calculated To verify the results of theintermix model several samples are taken from the different positions of the slab andchemical composition of several elements are measured using a spectrometry technique inMobarakeh Steel Company Comparison shows that a reasonable agreement was achieved The model results show that the weight of mixed grade steel are affected by parameterssuch as molten steel volume in the tundish at the time of new ladle opening slabdimensions rate of casting and non isothermal effect on the tundish The obtained resultsalso show that the effect of difference temperature between two mixing grade bothdecreasing mixed grade in the tundish and decreasing mixed grade in the slab especiallyunder certain conditions
استاد راهنما :
حسين ادريس، علي شفيعي
استاد مشاور :
احمد رضا پيشه ور، غلامرضا آريانپور
استاد داور :
محمدرضا ابوطالبي، حسين سيدين، محمود مرآتيان، احمد كرمانپور
