کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7053526 1457609 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Computational study of aeration for wastewater treatment via ventilated pump-turbine
ترجمه فارسی عنوان
مطالعه محاسباتی هوادهی برای تصفیه فاضلاب از طریق پمپ توربین تهویه
کلمات کلیدی
شبیه سازی گردابی بزرگ، جریان چند مرحلهای، هوادهی مدل چند فاز مخلوط، انحلال اکسیژن، تصفیه فاضلاب،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Large eddy simulations were performed on a modular pump-turbine to study oxygen dissolution inside the draft tube. Air injection was applied over the runner cone surface during turbine operation. Data regarding bubble size, void fraction and interfacial area concentration were presented to understand their influence on oxygen dissolution. Transient single phase and multiphase flow simulations were carried out to investigate the influence of air injection and dissolution within the flow field and turbine performance. Multiphase simulations were conducted by using the mixture multiphase model. The mathematical modeling of oxygen dissolution employed was validated by comparing predicted oxygen dissolution against experimental measurements performed by Zhou et al. (2013). The averaged dissolved oxygen concentration in the range of 1.2-1.4 mg/l was obtained; which is sufficient for an active aerobic microorganism activity for wastewater treatment processes. Dissolution efficiency and the amount of averaged dissolved oxygen inside the draft tube were sensitive to the inlet bubble size. The efficiency of the dissolution increases strongly as the inlet bubble size was reduced. The obtained results revealed that vortex suppression was achieved through air admission within multiphase flow simulation. Moreover, the power generation of the turbine was hardly influenced by the aeration through the runner cone.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 69, February 2018, Pages 43-54
نویسندگان
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