کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
659640 1458132 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Drag-reducing and heat transfer characteristics of a novel zwitterionic surfactant solution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Drag-reducing and heat transfer characteristics of a novel zwitterionic surfactant solution
چکیده انگلیسی

Experiments were conducted to study the drag-reduction and heat transfer performances of a newly synthesized zwitterionic surfactant solution (oleyl trimethylaminimide) in a two-dimensional channel. For testing the drag-reduction at subzero temperatures, a 20% ethylene glycol aqueous solution (EG/W) was used as solvent. The surfactant concentration ranged from 50 to 1000 ppm and the temperature was −5 and 25 °C, respectively. It was found that the novel zwitterionic surfactant solution showed both drag and heat transfer reduction characteristics, which were affected by concentration and temperature. The maximum drag-reduction was 83% at 25 °C for 200 ppm surfactant solution. The effects of addition of NaNO2 to the surfactant solution were also investigated. For enhancing heat transfer of the surfactant drag-reducing flow, a destructive device, named Block, was designed and used in the experiments. The Block device has two contracting–expanding flow passages on both sides respectively with the central part blocked. It was found that the Block device can enhance the heat transfer performance of the novel zwitterionic surfactant solution to some extent while having a very small pressure drop penalty compared with other researcher’s destructive devices due to the dominant action of elongational stress.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Mass Transfer - Volume 52, Issues 15–16, July 2009, Pages 3547–3554
نویسندگان
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