پديد آورنده :
بهادري، ميترا
عنوان :
تاثير اندازه واحد بهره برداري بر بهره وري ذرت علوفه اي دربخش مركزي شهرستان اصفهان
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
توسعه روستايي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده كشاورزي
صفحه شمار :
دوازده، 90، [II]ص.: مصور، جدول
يادداشت :
ص. ع. به: فارسي وانگليسي
استاد راهنما :
جواد ميرمحمد صادقي
استاد مشاور :
كميل طيبي، عباسعلي دهقاني
تاريخ نمايه سازي :
23/07/1387
استاد داور :
امير مظفر اميني، خورشيد رزمجو
چكيده فارسي :
به فارسي وانگليسي: قابل رويت در نسخه ديجيتال
چكيده انگليسي :
AbstractThis work has analyzed wave instabilities on steel strip in coating process The aim of thisstudy is to compare the results obtained by a small perturbations method with anexperimental approach Linear and tow dimensional Instabilities equations have beenderived by small perturbations method and solved through numerical simulations Theinvestigation emphasizes the effect of controlling wiping parameters the pressure gradientand distributions induced by the jet on the molten layer thickness The local instabilityanalysis has been shown that disturbances grow strongly in the area close to the gas knives before passing them After passing the gas knives the pressure gradient and surface shearstress stabilizes the flow Far from the gas knives where stabilizer effects are negligible the flow is weakly unstable caused by gravity Based on this theory growth rate wavespeed wave number and multiple waves length of instabilities have been studied For anexperimental approach longest wave length has been calculated about 39 cm with FastFourier Transform method on certain galvanized strip thickness This wave length has beensituated in week instability region Good agreement has been found between numericalsolution and experimental work Numerical results show that effect of edge build upinstabilities lead to increase instability growth rate and amplification function on platewidth These instabilities are produced with jets on plate edges Comparison betweenexperimental results indicates that molten layer thickness increasing leads to decreasing indominant wave length In according to numerical results instability amplification functionincreasing happened in smaller wave length In conclusion when coating thicknessincreases wave instabilities will be larger
استاد راهنما :
جواد ميرمحمد صادقي
استاد مشاور :
كميل طيبي، عباسعلي دهقاني
استاد داور :
امير مظفر اميني، خورشيد رزمجو
