مروری بر بررسی روش‌های اندازه‌گیری ویسکوزیته مذاب فلزات

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه مکانیک دانشگاه صنعتی اراک

2 دانشجوی کارشناسی ارشد گروه مهندسی مواد ومتالورژی دانشگاه تربیت مدرس

3 دانشیار گروه مهندسی مواد ومتالورژی دانشگاه تربیت مدرس

چکیده

در بسیاری از فرایندهای تولیدی که بر پایه ذوب و انجماد می باشد، مانند ریخته گری، اندازه گیری ویسکوزیته و پیش بینی سیالیت مذاب فلزات در دماها  و ترکیب های مختلف می تواند باعث بهبود فرآیند تولید و کاهش ضایعات شود. در این مقاله شماری از روشهایی که برای اندازه گیری ویسکوزیته مذاب ها و سیالات مورد استفاده قرار می گیرد، شرح داده شده اند. از این میان می توان به روشهای موئینگی، مخزن نوسانگر، بوته چرخان، صفحه نوسانگر، مخزن با سوراخ تخلیه و ... اشاره نمود. از جمله مدل هایی که برای تخمین ویسکوزیته عناصر و سیستم های چند جزئی و همچنین ارتباط ویسکوزیته با دما، استفاده شده اند عبارتند از مدل آرینیوس ، جبرا ، آندرید ، تئوری حجم آزاد هیلدبراند و ... . در نهایت مقایسه ای از روشهای مختلف اندازه گیری ویسکوزیته مذاب ها ارائه شده است.

کلیدواژه‌ها


عنوان مقاله [English]

A Review on Investigation of different methods for measuring molten metal viscosity

نویسندگان [English]

  • S.Hossein Elahi 1
  • Hadi Abdi 2
  • Hmidreza Shahverdi 3
چکیده [English]

In many manufacturing process which are based on melting and solidification, like casting, measurement of viscosity and prediction of fluidity of molten metal in variant temperatures and alloy composition could improve quality of process and decreasing losses. In this paper different methods for measurement of viscosity like capillary method, oscillating vessel viscometer, falling body or counterbalanced sphere viscometer, oscillating plate method, rotating cylinder and … have been investigated. Arrhenius equation, Andrade treatment, Hildebrand’s free volume theory, Chhabra model and … are the models which were used for estimation of viscosity of metals and alloys and their relation with temperature. Finally comparison of different procedure for viscosity measurement of molten metals is presented.

کلیدواژه‌ها [English]

  • Viscosity
  • molten metal
  • viscosity measurement
  • models for viscosity measurement
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