تشکیل یخ بر روی سطوح در معرض جریان حاوی قطرات فوق سرد با روش هیدرودینامیک ذرات هموار

نوع مقاله : مقاله پژوهشی

نویسنده

گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه ولی عصر(عج)، رفسنجان، ایران

چکیده

برای شبیه­سازی پدیدۀ سه فازی تشکیل یخ روی یک جسم جامد که در معرض جریان هوای مرطوب قرار دارد، از روش هیدرودینامیک ذرات هموار با فرض قابلیت تراکم ضعیف با در نظر گرفتن معادلات در مختصات سه بعدی استفاده شد. فرض شد که هوا حامل قطرات آب فوق سرد است که در صورت برخورد به سطح جامد بخشی از این قطرات تغییر فاز داده، به یخ تبدیل می­شوند. برای توصیف این پدیده معادلات هیدرودینامیک سیال به همراه معادلات موازنۀ انرژی در نظرگرفته و حل شد. از آنجا که بازده جمع­آوری سطح به‌دست آمده از این روش برای جریان روی کره با آنچه که در منابع به‌دست آمده است، مطابقت خوبی داشت اعتبار روش تأیید شد. سپس از این روش برای پیش‌بینی فرایند تشکیل یخ در شرایط مختلف استفاده شد. از جمله اثر عدد بی بعد استوکس بر بازده محلی جمع­آوری و اثر شار حرارتی سطح بر بازده محلی و متوسط تشکیل یخ بررسی شد. مشاهده شد که بازده جمع­آوری در مرکز جسم بیشتر بوده و با افزایش عدد استوکس بیشتر می­شود. متعاقباً بازده متوسط تشکیل یخ با افزایش شار کاهش می­یابد، هم­چنین بازده کلی تشکیل یخ در مرکز جسم بیشتر و در کناره­ها کمتر است.

کلیدواژه‌ها

عنوان مقاله [English]

Predicting Ice Formation on the Surfaces Exposed to the Air Containing Supercooled Droplets Using Smooth Particle Hydrodynamics Method

نویسنده [English]

  • M. M. Kamyabi
Vali-e-Asr University of Rafsanjan
چکیده [English]

Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH) was applied to simulate the three dimensional, three-phase phenomenon of ice formation on a solid surface exposed to the humid airflow. It was assumed that air contains supercooled droplets of that, upon collision with a solid surface, some of them undergo a phase change and turn to ice. To describe this phenomenon, fluid hydrodynamic equations along with energy balance equations were considered and solved. The validity of the method was confirmed because the collection efficiency obtained from this method for flow on spheres was in good agreement with the literature. Then this method was used to predict this process in different conditions. The effect of Stokes dimensionless number on local collection efficiency and the effect of surface heat flux on the local and average ice formation efficiency were investigated. It was observed that the collection efficiency is higher in the center of the body and increases with increasing Stokes number. Consequently, the average efficiency of ice formation decreases with increasing flux. Also, the overall efficiency of ice formation in the center of the body is higher and less at the sides.

کلیدواژه‌ها [English]

  • Smoothed Particle Hydrodynamics (SPH)
  • Phase Change
  • Collection Efficiency
  • Heat Flux

مراجع

 

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مهندسی شیمی ایران
دوره 20، شماره 115
خرداد و تیر 1400
صفحه 62-72

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