کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1688431 1518960 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study of unsteady rarefied gas flow through an orifice
ترجمه فارسی عنوان
مطالعه عددی جریان گاز تصفیه نشده از طریق یک سوراخ
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
چکیده انگلیسی


• The unsteady rarefied gas flow through an orifice is investigated numerically.
• The time evolutions of macroscopic parameters and mass flow rate are obtained.
• Time to reach the steady state mass flow rate is estimated.
• A simple fitting expression is proposed for the approximation of the mass flow rate evolution in time.

Transient flow of rarefied gas through an orifice caused by various pressure ratios between the reservoirs is investigated for a wide range of the gas rarefaction, varying from the free molecular to continuum regime. The problem is studied on the basis of the numerical solution of unsteady S-model kinetic equation. It is found that the mass flow rate takes from 2.35 to 30.37 characteristic times, which is defined by orifice radius over the most probable molecular speed, to reach its steady state value. The time of steady flow establishment and the steady state distribution of the flow parameters are compared with previously reported data obtained by the Direct Simulation Monte Carlo (DSMC) method. A simple fitting expression is proposed for the approximation of the mass flow rate evolution in time.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 109, November 2014, Pages 253–265
نویسندگان
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