بررسی جریان و خواص ترموفیزیکی نانوسیال ها در نانوکانال با استفاده از شبیه‌سازی دینامیک مولکولی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه مهندسی مکانیک، دانشگاه هرمزگان، بندرعباس، ایران

2 دانشیار، گروه مهندسی مکانیک، دانشگاه هرمزگان، بندرعباس، ایران

3 استادیار، دانشکده مهندسی شیمی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته، کرمان، ایران

4 استادیار، گروه مهندسی مکانیک، دانشگاه هرمزگان، بندرعباس، ایران

چکیده

در مقاله حاضر، ابتدا ضریب رسانای گرمایی نانوسیال با چهار نوع ذره شامل مس، نقره، پلاتین و طلا با سیال پایه آب درون یک نانوکانال مسی با استفاده از روش دینامیک مولکولی غیرتعادلی با میدان نیرو Pcff محاسبه ‌شده است. نتایج نشان می­دهد که نانوسیال نقره بیشترین افزایش ضریب رسانای گرمایی را دارد. بررسی برهمکنش و تمایل بین آب و نانو­ذره با استفاده از آنالیز تابع توزیع شعاعی (RDF) و ضریب نفوذ نانوسیال درون نانوکانال انجام گردیده است. همچنین خواص ترموفیزیکی نانوسیال­ها شامل CP,CV به روش دینامیک مولکولی تعادلی مورد بررسی قرار گرفت، بررسی­ها نشان می­دهد که با افزایش نانوذره به آب مقدار گرمایی ویژه در فشار و حجم ثابت کاهش می­یابد. در بررسی نمودار توزیع چگالی اتم‌ها، نتایج نشان داد که بیشترین شدت چگالی مربوط به نانوذره نقره و بیشترین ضخامت لایه آب تشکیل‌شده در کنار نانوذره طلا می­باشد. لزجت نانوسیال­ها از دو روش دینامیک مولکولی تعادلی و غیرتعادلی نیز محاسبه و مشخص گردید با افزایش نانوذره در نانوسیال،­ لزجت آن افزایش می­یابد.

کلیدواژه‌ها

موضوعات


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