دینامیک حرکت یک حباب در کانال شیب‌دار در اعداد رینولدز محدود

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشگاه بوعلی سینا، همدان ، ایران

2 دانشجوی دکتری، دانشگاه بوعلی سینا، همدان ، ایران

چکیده

حرکت حباب‌ها روی سطوح شیب‌دار مانند کانال‌های شیب‌دار، دارای کاربردهای علمی و صنعتی بی‌شماری است. در پژوهش حاضر به بررسی و شبیه‌سازی سه‌بعدی حرکت عرضی یک حباب درون کانال شیب‌دار در جریان پواسل، با حضور نیروی گرانش پرداخته شده است. معادلات ناویر- استوکس که شامل کشش سطحی است، به‌صورت عددی به‌وسیله روش اختلاف محدود/ ردیابی جبهه حل می‌شوند. این روش، ترکیبی از روش‌های تسخیر و ردیابی قطره است. نتایج شبیه‌سازی حاکی از آن است که سرعت بدون بعد در جهت جریان با افزایش عدد کاپیلاری افزایش می‌یابد؛ همچنین با افزایش شیب سطح، مقدار نیروی گرانش در راستای جریان ( ) افزایش و مقدار نیروی گرانش در جهت عمود بر جریان ( ) کاهش می‌یابد و حباب به مرکز کانال نزدیک‌تر می‌شود. در بررسی سرعت محوری حباب نسبت به زمان در زاویه‌های شیب سطح مختلف ( )، مشاهده شد که با افزایش مقدار زاویه شیب، سرعت حباب افزایش می‌یابد.

کلیدواژه‌ها


عنوان مقاله [English]

Motion Dynamics of a Bubble in an Inclined Channel at Finite Reynolds Numbers

نویسندگان [English]

  • amireh Nourbakhsh 1
  • abbas eini 2
1 Assistant Professor, Bu-Ali Sina University,Hamadan, Iran
2 PhD student, Bu-Ali Sina University.Hamadan, Iran
چکیده [English]

The movement of bubbles on inclined surfaces, such as inclined channels, has numerous scientific and industrial applications. In the present study, a three-dimensional study of the lateral motion of a bubble within an inclined channel due to the pressure gradient (Poiseuille flow) in the presence of gravity force is investigated. The Navier-Stokes equations are solved numerically using the finite difference/front tracking method. This method is a combination of drop capture and tracking methods. The results demonstrate that the dimensionless velocity in the flow direction is enhanced with the capillary number. Also, as the channel inclination angle increases, the amount of gravitational force in the direction of the flow ( ) increases and the amount of gravitational force in the direction perpendicular to the flow ( ) decreases, and the bubble becomes closer to the channel center. It is found that the axial velocity of the bubble increases with the channel inclination angle.

کلیدواژه‌ها [English]

  • Bubble
  • Finite Difference/Front Tracking Method
  • Poiseuille Flow
  • Capillary Number
  • Channel Inclination Angle
  • Froude Number

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دوره 11، شماره 1 - شماره پیاپی 29
بهار و تابستان 1401
شهریور 1401
صفحه 133-144
  • تاریخ دریافت: 26 فروردین 1401
  • تاریخ بازنگری: 10 تیر 1401
  • تاریخ پذیرش: 31 تیر 1401
  • تاریخ انتشار: 01 شهریور 1401