مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی عددی تأثیر گسترش عمودی هندسه غشاء بر جداسازی ذرات غیر کلوئیدی از جریان

نویسندگان
1 مهندسی مکانیک، دانشگاه فردوسی مشهد، مشهد، ایران
2 استاد-دانشگاه فردوسی مشهد
چکیده
استفاده از هندسه های مختلف غشاء برای جداسازی ذرات در فرایندهای تصفیه یا تغلیظ، مورد توجه گروهی از محققین قرار گرفته است. هر تغییری در هندسه غشاء که باعث تغییر در شانس ذرات برای برخورد و چسبیدن به سطوح سوراخ‌ها شود، می‌تواند نتیجه فرایند جداسازی را به شکل قابل توجهی دستخوش تغییر نماید. در این تحقیق با استفاده از روش شبکه بولتزمن در ترکیب با یک مدل جامع برخورد، مشخصه های رسوب بر هندسه توسعه یافته غشاء بررسی شده است. توسعه غشاء به صورت دو سطح عمودی سوراخدار گسترش یافته در طرف جریان در نظر گرفته شده است. در این حالت غشاء در دو بازه زمانی متفاوت "رسوب پیش رونده" و "توسعه کیک جرمی" عمل می‌کند. در بازه اول، پیکره بندی غشاء در بعد طول به سه محدوده بسته، فعال، و غیر فعال تقسیم شده و رسوب ذرات در محدوده فعال سبب جابجایی مرز رسوب شده و در نتیجه محدوده های فعال به بسته و غیر فعال به فعال تبدیل می‌گردد؛ همچنین در بازه زمانی دوم و پس از بسته شدن عمده مسیرهای جریان، انسداد غشاء با رشد کیک جرمی در سراسر طول المان جداساز تقویت می‌شود. نمایه های به دست آمده برای منحنی شار جرمی نشان دهنده یک آهنگ اولیه کاهش شار جرمی با تقعر منفیست که بیش از نیمی از دوره عملکرد غشاء را در بر می‌گیرد و در مقایسه با هندسه های توسعه نیافته، می‌تواند به شکل قابل توجهی، عبور حجم بیشتری از جریان را مقدور ‌سازد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Numerical Study on The Impact of Pore Geometry Extension on Dead-Ended Fouling Characteristics of Non-Colloidal Particles

نویسندگان English

Ehsan Davarpanah 1
Ali Reza Teymourtash 2
1 Mechanical Enginnering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده English

Applying membranes with especial geometries and fouling characteristics has been an area of research and a subject of interest in membrane science community. While a considerable part of fouling happenings are originated from chaotic roots such as Brownian motions, the remainders can be scheduled to approach on desired filtration features. Here in this study the somehow invisible features of progressive fouling which is the case for novel micro-engineered membranes was realized in some details. The problem of progressive fouling was considered as a result of dead-ended filtration of non-colloidal particles over a vertically extended pore geometry. It was shown that, in this filtration apparatus, due to a serialized activation and deactivation of flow passages, progressive fouling can change its seat with other more flow resistive classical types of surface and pore blockings and control filtration path more apparently. Results was considered for different amounts of pore extension and porosities. It was found that employing an especial set of pore extension length and porosity make it feasible to derive manageable filtration processes with high levels of purification and permeation performances.

کلیدواژه‌ها English

Membrane
progressive fouling
cake formation
Lattice Boltzmann
non-colloidal
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