کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8067370 1521098 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study on flow pattern of sonic steam jet condensed into subcooled water
ترجمه فارسی عنوان
مطالعه عددی الگوی جریان جت بخار صوتی به داخل آب زیرزمینی تبدیل می شود
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی مهندسی انرژی و فناوری های برق
چکیده انگلیسی
For stable sonic steam jet, conical and ellipsoidal steam plumes were observed by many researchers. Restricted by experimental method, the difference in flow and heat transfer characteristic between conical and ellipsoidal steam plumes was still unclear. To reveal the difference between the two kinds of steam plumes, three-dimensional steady numerical simulations were carried out with Eulerian multiphase model, and a thermal equilibrium phase change model was inserted into Fluent as a user defined function (UDF) to investigate the condensation phenomenon. The CFD results were compared with experimental results to testify the correctness of simulation, and good agreement was observed. Then steam pressure was varied to study its effect on the process of condensation jet. Conical and ellipsoidal steam plumes were obtained under different operating conditions. For conical steam plume, it is compressed near nozzle exit along radial direction, and the pressure in steam plume is larger than ambient pressure. However, when it comes to ellipsoidal steam plume, it expands near the nozzle exit along radial direction, when steam plume expands to the maximum extend, the pressure in steam plume is reaching the bottom, almost the same as ambient pressure. Besides, the influence of flow characteristic of steam in plume on axial temperature and steam plume shape was analyzed. When steam in plume reaches supersonic, the shape of steam plume shows ellipsoidal shape, and there is a peak along axial temperature distribution. Otherwise, it presents conical shape and axial temperature decays to ambient water temperature monotonously.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Nuclear Energy - Volume 99, January 2017, Pages 206-215
نویسندگان
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