توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Numerical Simulation of Fluid Flow and Solidification in the Casting of an automotive Flywheel Part
نویسنده(ها): ، ،
اطلاعات انتشار: چهاردهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۶
The fluid flow and solidification sequences in the casting of an automobile flywheel part were simulated in three dimensions using the commercial, general purpose, CFD code FLOW–3D. The solid models of different parts of the automatic sand casting system including the casting, gating system and filter were discretised with a multi–block design. The mould roughness and contact angle were applied to the model based on the properties of the casting mould used. The turbulent flow was simulated using the two–equation k– turbulence model. The D’Arcy model was used to analyze the fluid flow throughout the ceramic filter positioned in the gating system. The proper boundary conditions were assigned in the model so that the simulated filling time was achieved compared to the real experimental observations. The simulated flow pattern showed that the first gate of each casting in the multiple–mould is not working properly as it remains half–filled and therefore could enable the melt to absorb air causing porosity formation in the cast parts. A smaller first gate was suggested to make it fully–filled throughout the casting. The solidification behaviour of the system revealed the same cooling pattern for all cast parts in the mould as well as a suitable casting performance in terms of weight of the gating system.<\div>

۲An apparatus for real time study of free dendritic growth: Design, manufacture and testing
اطلاعات انتشار: سومین کنفرانس بین‌المللی آلومینیوم ایران IIAC2014، سال
تعداد صفحات: ۴
Dendritic growth is a common mode of crystal growth observed in many metals, alloys and other materials. Recently, the use of electric current during solidification has been proposed as a suitable tool to modify the dendritic microstructures. Mechanisms by which an electric field could affect dendritic morphology are not entirely clear as it is difficult to study solidification phenomena during cooling. This research reports the design and manufacture of an instrument for in–situ study of dendrite growth of transparent model materials in the presence of an electric field. The system consists of an isothermal bath, a growth chamber and an optical and imaging system. The growth chamber is located inside the isothermal bath which controls the melting and subsequent cooling of the melt during solidification. The structure of the growth chamber is designed so that to allow for growth of only a single dendrite under the applied electric field. The solidification process of a transparent model material (succinonitrile) was observed using this instrument. During the experiments, photographs and videos of the single dendrite were obtained by an built–in optical and imaging system to explore the relationship between the electric current and the growth conditions.<\div>
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