کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
789236 1466396 2016 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A comprehensive modeling of choked two-phase flow through short-tube orifices with application to alternative refrigerants HFO-1234yf and HFO-1234ze
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
A comprehensive modeling of choked two-phase flow through short-tube orifices with application to alternative refrigerants HFO-1234yf and HFO-1234ze
چکیده انگلیسی


• Simulation of evaporating two-phase flow through short tube orifices.
• Vaporization and two-phase flow effects in entrance region.
• Less deviation from experimental data in comparison with previous simulations.
• Applied to develop selection charts based on HFO-1234yf and HFO-1234ze.

Due to the evaporating two-phase flow and the choked-flow condition, numerical analysis of flow through short-tube orifices is a complicated procedure. A comprehensive method for analyzing such flows is the two-fluid model, which does not assume equilibrium between phases. However, in all previous applications of this model, two-phase flow calculations at the entrance and vena contracta regions were eliminated. In this investigation, two additional steps were introduced to improve the accuracy of computations: (1) applying a comprehensive two-fluid model, including the effect of various two-phase flow patterns and the metastability of liquid phase; and (2) performing a two-phase analysis of the evaporating flow through the entrance and vena contracta, which involves simulation of this region as a contraction from the up-stream to the throat, and an expansion from the throat to downstream. Results showed more compatibility with experimental data in comparison with those of previous investigations for predicting the critical flow condition of common refrigerants HFC-134a, HCFC-22, and HFC-410a through short-tube orifices. In addition, the developed numerical scheme was utilized in order to develop selection charts for short-tube orifices based on the common refrigerant HFC-134a and the alternative newly released hydrofluoroolefin refrigerants HFO-1234yf and HFO-1234ze.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refrigeration - Volume 69, September 2016, Pages 114–135
نویسندگان
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