Afrand, M., Kasiri, M. (2016). Flow simulation of gallium in a cylindrical annulus in the presence of a magnetic field for improving the casting process. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(2), 299-308.
Masoud Afrand; Masoud Kasiri. "Flow simulation of gallium in a cylindrical annulus in the presence of a magnetic field for improving the casting process". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9, 2, 2016, 299-308.
Afrand, M., Kasiri, M. (2016). 'Flow simulation of gallium in a cylindrical annulus in the presence of a magnetic field for improving the casting process', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(2), pp. 299-308.
Afrand, M., Kasiri, M. Flow simulation of gallium in a cylindrical annulus in the presence of a magnetic field for improving the casting process. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2016; 9(2): 299-308.
Flow simulation of gallium in a cylindrical annulus in the presence of a magnetic field for improving the casting process
1Assistant Professor, Department of Mechanical Engineering, Najaf Abad Branch, Islamic Azad University, Najaf Abad, Iran.
2Assistant Professor, School of Materials Engineering, Najaf Abad Branch, Islamic Azad University, Najaf Abad, Iran.
Abstract
Free convection flow in an enclosure filled with a congealing melt leads to the product with a nonuniform structure involving large grains. The convective flows are decreased by applying an appropriate magnetic field, obtaining uniform and small grain structures. In this work, using the finite volume method, we investigated the application of a magnetic field to the convective heat transfer and temperature fields in steady and laminar flows of melted gallium in an annulus between two horizontal cylinders. The inner and outer walls of the annulus are hot and cold, respectively. Moreover, the effect of the magnetic field on the flow and temperature distribution has been investigated. The influence of the variation of other parameters including the Rayleigh number and the angle of the magnetic field on the flow and temperature field also have been studied. It has been revealed that on changing the field angle to the horizon, the Nusselt number (Nu) is increased, which is of importance in a specific range of Hartmann numbers. Also with increasing the Rayleigh number, the change in Nu with the magnetic field intensity does not occur.
شبیه سازی جریان گالیوم در یک قالب حلقوی در حضور میدان مغناطیسی به منظور بهبود فرآیند ریخته‌گری
Authors [Persian]
مسعود افرند1; مسعود کثیری2
1استادیار، گروه مهندسی مکانیک، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.
2استادیار، دانشکده مهندسی مواد، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.
Abstract [Persian]
وجود جریان جابجایی آزاد درون محفظه‌ای که از یک مذاب در حال انجماد پر شده است باعث پدیدار شدن یک ساختار غیر همگن و درشت دانه در محصول نهایی می‌گردد. با اعمال میدان مغناطیسی مناسب بر مذاب درون محفظه، جریان جابجایی آزاد کاهش یافته و یک ساختار ریز دانه و همگن در محصول نهایی بوجود می آید. در این تحقیق، با استفاده از روش حجم محدود، به بررسی عددی تأثیر اعمال یک میدان مغناطیسی بر جریان جابجایی آزاد و میدان دما در حالت دائم و آرام درون یک حلقه طویل، که گالیم مذاب در فضای بین دو استوانه افقی هم محور قرار دارد پرداخته شده است. دیواره‌های خارجی و داخلی حلقه به ترتیب دارای دمای سرد و گرم هستند. اثر قدرت میدان مغناطیسی بر میدان جریان و میدان دما، تأثیر تغییرات پارامترهای مختلف دیگری نظیر عدد رایلی، زاویة اعمال میدان مغناطیسی و نسبت شعاع های داخلی و خارجی حلقه بر میدان جریان و میدان دما مورد بررسی قرار گرفت. نتایج نشان داد که با مایل کردن میدان معناطیسی نسبت به افق مقدار عدد ناسلت افزایش یافت که این افزایش در بازه ای خاص از اعداد هارتمن محسوس تر است. همچنین با افزایش عدد رایلی روند تغییر عدد ناسلت برحسب قدرت میدان مغناطیسی تغییری نمی‌کند.
Keywords [Persian]
شبیه سازی عددی، گالیوم مذاب، میدان مغناطیسی، جابجایی آزاد، فرآیند ریخته گری
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