اثر موقعیت موانع و تزریق جریان بر اختلاط جریان دوگازی در میکروکانال

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی هوافضا، دانشگاه سمنان، سمنان، ایران

چکیده

در پژوهش حاضر، به منظور بررسی اثر تعداد، موقعیت موانع و تزریق جریان بر اختلاط جریان در میکروکانال با طول 16 میکرومتر و ارتفاع 1 میکرومتر از روش شبیه‌سازی مستقیم مونت‌کارلو استفاده شده است. از معیار طول اختلاط که برابر با طولی است که در آن دو گونه کاملاً با یکدیگر مخلوط می‌شوند، برای بررسی اختلاط جریان استفاده شده است. هشت نمونه با نسبت انسداد مختلف برای بررسی اثر موانع در نظر گرفته شده است. نسبت انسداد، بیانگر کاهش سطح مقطع عبوری جریان از داخل کانال با اضافه شدن موانع است. در همه موارد دو گونه گازی کربن‌مونواکسید و نیتروژن توسط یک صفحه که تا یک‌سوم طول کانال کشیده شده از هم جدا می‌شوند. با افزایش نسبت انسداد، طول اختلاط تا 10% کاهش و دبی جرمی نیز به طور قابل توجهی کاهش می‌یابد. همچنین تزریق جریان به داخل کانال با درنظرگیری چهار نمونه بررسی شد. نمونه‌ها عبارتند از: نمونه اول فاقد تزریق، نمونه دوم با تزریق جریان عرضی، نمونه سوم با تزریق جریان خلاف جهت و نمونه چهارم با تزریق عرضی از داخل مانع. طول اختلاط در نمونه دوم و سوم به ترتیب 17% و 5% افزایش یافت. در نمونه چهارم به دلیل وجود مانع، طول اختلاط 2% کاهش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Obstacles Location and Flow Injection on the Mixing of Two-Gaseous Flow in a Microchannel

نویسندگان [English]

  • Elyas Lekzian
  • Hamid Reza Farshi Fasih
Faculty of Aerospace Engineering,, Semnan University, Semnan, Iran
چکیده [English]

In the present study, the direct simulation Monte Carlo method is utilized to investigate the effect of obstacles number, location, and also flow injection on the mixing in a channel with 16 μm length and 1 μm height. A mixing length is defined which is the length at which two species are mixed completely. Eight cases with different blockage ratios are considered to study the obstacle effect on the mixing. The blockage ratio shows the reduced flow cross-section due to the addition of obstacles. In All cases, CO2 and N2 gases enter the domain and are separated by a splitter plate that extends up to 1/3 of the channel. The blockage ratio increasing decreases mixing length by up to 10%. Whereas the mass flow rate decreased significantly. Flow injection into the channel is also studied. Four cases are considered: the first case is a simple channel without injection, the second case has cross injection, the third case has inverse injection, and flow is injected vertically through an obstacle in the fourth case. Mixing length is increased by 17% and 5% for cases 2 and 3, respectively. In case 4, the mixing length is decreased by 2% due to the obstacle.

کلیدواژه‌ها [English]

  • Direct simulation Monte Carlo
  • Mixing length
  • Obstacle location
  • Blockage ratio
  • Flow injection

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نشریه مهندسی مکانیک امیرکبیر
دوره 54، شماره 9
آذر 1401
صفحه 2139-2156

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