کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
660924 1458121 2010 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis and active control of pressure-drop flow instabilities in boiling microchannel systems
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Analysis and active control of pressure-drop flow instabilities in boiling microchannel systems
چکیده انگلیسی

Pressure-drop oscillations are one of the most severe dynamic instabilities for boiling flow especially in microchannel systems. This paper presents a systematic framework for the transient analysis and active control of microchannel flow oscillations at a system-level view. To quantify the upstream compressibility and the associated oscillatory transients in an experimental microchannel boiling system, a lumped oscillator model is derived from the momentum balance equation, and both analytical and numerical nonlinear parameter identification methods are proposed. The predictions from the flow oscillation model agree well with the experimental pressure-drop observations across a flow meter and a microchannel heat sink. Based on the identified nonlinear oscillator model, a virtual state observer is designed to estimate the mass flow acceleration from the mass flowrate measurement in the boiling channel. Then a family of state and dynamic output-feedback active flow controllers is developed and evaluated for the dynamic pressure-drop instability suppression. Further analysis and simulations show the flow oscillation amplitude can be regulated to whatever level is desired under certain conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 53, Issues 11–12, May 2010, Pages 2347–2360
نویسندگان
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