کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
667036 1458585 2008 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Experiments on two-phase flow distribution inside parallel channels of compact heat exchangers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Experiments on two-phase flow distribution inside parallel channels of compact heat exchangers
چکیده انگلیسی

Uneven distribution in heat exchangers is a cause of reduction in both thermal and fluid-dynamic performances. Many papers have dealt with single-phase flow and both flow distribution data and analytical or numerical models are available for header design. With regard to two-phase flow, phase separation in manifolds with several outlets is so complicated that, to date, there is no general way to predict the distribution of two-phase mixtures at header-channel junctions. The design of headers for new generation compact heat exchangers and multi-microchannel evaporators is still based on an empirical approach, as a number of variables act together: geometrical parameters and orientation of the manifolds and of the channels, operating conditions, fluid physical properties.In the present paper measurements of the two-phase air–water distributions occurring in a cylindrical horizontal header supplying 16 vertical channels are reported for upward flow. The effects of the operating conditions, of the header-channel distribution area ratios and of the inlet port orifice plates were investigated. The flow rates of each phase flowing in the different channels were measured. Time varying, void fraction data were also analysed to characterise the two-phase flow patterns. Video records were taken in order to infer different flow patterns (from intermittent to annular) inside the header-channel system.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Multiphase Flow - Volume 34, Issue 2, February 2008, Pages 128–144
نویسندگان
, , , , ,