مطالعه عددی تأثیر خواص الاستیک سیال بر برخورد مایل قطره بر لایه سیال

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه صنعتی شاهرود، شاهرود، ایران

2 دانشکده مهندسی شیمی، دانشگاه الوال، کبک، کاناد

چکیده

در مقاله حاضر تشکیل و رشد تاج بر اثر برخورد مایل قطره بر لایه سیال در سیالات غیرنیوتنی ویسکوالاستیک به صورت عددی و در حالت دو بعدی تحت بررسی قرار گرفته است. از روش حجم محدود جهت مدلسازی معادلات حاکم و از روش حجم سیال جهت ردگیری سطح آزاد بین دو سیال استفاده شده است. در این مطالعه از مدل اولدروید- بی به عنوان معادله ساختاری جهت مدلسازی فاز سیال ویسکوالاستیک استفاده شده است. در تحلیل عددی حاضر تشکیل و رشد زمانی هندسه تاج مورد تاکید است و تأثیر نیروهای الاستیک سیال و کشش سطحی بر روی آن مورد بررسی و ارزیابی قرار گرفته است. نتایج بیانگر آن است که افزایش در مقدار عدد وایزنبرگ، نسبت ویسکوزیته و عدد وبر سبب افزایش در مقادیر ارتفاع (*Z) و طول پخش (*S) بدون بعد تاج در زمان‌های مختلف می‌شود. از طرفی در سیالات ویسکوالاستیک افزایش زاویه برخورد در کنترل متغیر ارتفاع Z* هندسه تاج اثر قابل ملاحظه‌ای دارد و از طرف مقابل تأثیر چشمگیری بر طول پخش *S ندارد. همچنین نتایج بیانگر آن است که با افزایش ضخامت لایه سیال ارتفاع تاج افزایش و تغییرات طول پخش تاج روند کاهشی به خود می‌گیرد. از مهمترین نتایج قابل حصول از تحقیق حاضر می‌توان به تأثیر شگرف توامان خاصیت الاستیک سیال و کشش سطحی بر گسترش ابعاد تاج تشکیل شده از برخورد مایل قطره سیال اشاره کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical Investigation on the Fluid Elasticity Effect in the Impact of Oblique Drop onto Liquid Film

نویسندگان [English]

  • Mohammad Reza Rezaie 1
  • Mahmood Norouzi 1
  • Mohammad Hassan Kayhani 1
  • Seyed Mohammad Taghavi 2
1 Mechanical Engineering Department, Shahrood university of Technology, Shahrood, Iran
2 Chemical Engineering Department, Laval University, Quebec, Canada
چکیده [English]

In this paper, the crown formation and temporal propagation due to the oblique impact of a plane two-dimensional drop onto preexisting film in the non-Newtonian viscoelastic fluid are analyzed numerically. The finite volume method is applied to solve the governing equations and the volume of fluid technique is used to track the free surface of liquid phases. Here, the well-known Oldroyd-B model is used as the constitutive equation for the viscoelastic phase. However, the formation and temporal evolution of the crown’s shape is emphasized and the effects of elastic and surface tension forces on the crown’s dynamic are considered in detail. The results show that the increase in Weissenberg number, viscosity ratio, and Weber number leads to an increase in both the dimensionless crown height (Z*) and spread factor (S*), while impact angle has a major effect on the control of the crown’s height, on the other hand, this parameter has a negligible effect on spread factor in viscoelastic fluid. Moreover, by thickening of fluid film, the crown’s height increase, and the crown’s radius decrease. As the main finding of the present study, the fluid’s elasticity in the presence of surface tension force can enhance the rate of the crown propagation in the impact of an oblique drop onto liquid film.

کلیدواژه‌ها [English]

  • Viscoelastic non-Newtonian fluid
  • Oblique drop impact
  • Crown formation and propagation
  • Two phase flow
  • Volume of fluid
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