نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه فیزیک، دانشکدۀ علوم پایه، دانشگاه گیلان، رشت
2 پژوهشکدۀ فیزیک، پژوهشگاه دانشهای بنیادی(IPM)، تهران
چکیده
برای روشن شدن تأثیر ساختار داخلی مولکولها در اثر سُرِه، ما به بررسی اعمال گرادیان دما به یک تَک ذرۀ شناور در سیال میپردازیم. تک ذرۀ مورد بررسی با دو ریز کره که با فنر نرمی به یکدیگر متصل شدهاند، یا بهصورت جداگانه در دام دو انبرک نوری قرار گرفتهاند، مدل شده است. ما نیرویی که این مجموعۀ دوکرهای در حضور گرادیان دما، به سیال پیرامونِ خود وارد میکند را محاسبه کرده، و با استفاده از آن ضریب سُرۀ مربوط به این مدل دو ذرهای را به دست میآوریم. در گام بعدی، وابستگی گرانروی سیال به دما را در محاسبات وارد کرده، و اثر این تصحیح را بر نتایج خود بررسی میکنیم.
کلیدواژهها
موضوعات
عنوان مقاله [English]
Hydrodynamic interaction between two beads in the presence of a temperature gradient: Effect of correlation of beads’ motion on the Soret effect
نویسندگان [English]
- Golnaz Najafi Golvandani 1
- ّFereshteh Salari 1
- Seyed Nader Rasuli 2
1 Department of Physics, College of Science, University of Guilan
2 School of Physics, Institute for Research in Fundamental Sciences (IPM), Tehran
چکیده [English]
To study the effect of internal structure of molecules on the Soret effect, we probe consequences of exerting a temperature gradient to a suspension of one single particle inside the fluid. The particle is modeled as two microspheres, loosely connected with a spring between them, or each trapped with an optical tweezers. For the later case, we calculate the net force, that the two beads system exerts on its surrounding fluid, due to the a temperature gradient. This result, lets us calculate the corresponding Soret coefficient of the two beads system. We further correct these calculations, considering the temperature dependence of the surrounding fluid’s viscosity.
کلیدواژهها [English]
- temperature gradient
- Soret effect
- colloidal solution
- temperature dependence of the viscosity
- hydrodynamic interactions
- Langevin equation
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