کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7058710 1458078 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oscillatory instability of the gas-liquid meniscus in a capillary under the imposed temperature difference
ترجمه فارسی عنوان
بی ثباتی نوسانگر منیسک گاز مایع در مویرگی تحت اختلاف دما اعمال می شود
کلمات کلیدی
تبخیر، گاز مایع منیسک، نوسانات، بی ثباتی، لوله پالسی گرم
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
To understand the oscillations in the real, multi-branch pulsating heat pipe (PHP), the start-up conditions of the single branch PHP with no adiabatic section are studied theoretically and numerically. The single branch PHP is a capillary open from one end, which is connected to a reservoir at constant pressure. A gas bubble is confined between the sealed end of the capillary and the liquid. The gas is the vapor of the liquid. The gas end of the capillary is maintained at a constant temperature larger than that of the liquid end. Under certain conditions, self-sustained oscillations of the meniscus may exist in such a system. The conditions of oscillation development (i.e. of the PHP startup) are obtained via the stability analysis of an earlier proposed theoretical model. The linear instability is absent in such a system. The instability of a marginal state described by piece-wise linear equations is analyzed with the analytical averaging method. The instability boundary is presented in terms of dimensionless groups, the physical significance of which is discussed. It is found that the model describes correctly the known experimental facts. Some predictions concerning the instability threshold are formulated.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 64, September 2013, Pages 313-321
نویسندگان
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