کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7060098 1458474 2018 35 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of Gas Dynamic Virtual Nozzle Geometry on Micro-Jet Characteristics
ترجمه فارسی عنوان
تأثیر هندسه نازل پویا گاز بر روی ویژگی های میکرو جت
کلمات کلیدی
نازل مجازی گاز پویا، میکرو جت، جریان چند مرحله ای فشرده، روش حجم محدود حجم مایع جتینگ، چکیدن،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
In this paper we present a numerical study investigating the effects of nozzle geometry on stability, shape and flow characteristics of micron-sized liquid jets, produced by injection molded gas dynamic virtual nozzles (GDVNs) operating in vacuum. The jet characteristics are described as a function of (i) capillary-to-orifice distance, (ii) nozzle outlet orifice diameter, and (iii) liquid feeding capillary angle. An experimentally verified numerical model of GDVN with laminar two-phase Newtonian compressible flow, based on finite volume method and volume of fluid interface tracking, is used to assess the changes. The study is performed for two sets of liquid flow rates while keeping the gas flow rate constant. It is observed that for each value of capillary-to-orifice distance and nozzle outlet diameter there is a minimum liquid flow rate below which the jet is unstable. We find that the nozzle outlet diameter has the biggest influence on the jet diameter, length and velocity, while liquid capillary angle has no observable effect on jet characteristic. Varying capillary-to-orifice distance does not affect the flow field around micro-jet. It is found that the liquid and the gas interaction near the meniscus primarily affect the jet stability and shape.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 104, July 2018, Pages 152-165
نویسندگان
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