کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7060586 1458690 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Conjugate heat transfer, endothermic fuel pyrolysis and surface coking of aviation kerosene in ribbed tube at supercritical pressure
ترجمه فارسی عنوان
انتقال حرارت متحرک، پیرولیز سوخت اندورتریکی و ککینگ سطحی نفت سفید در لوله های رولتیک در فشار فوق بحرانی
کلمات کلیدی
واکنش شیمیایی پیرولیتی، فرو رفتن حرارت شیمیایی، رسوب کربن، افزایش انتقال حرارت، عامل عملکرد حرارتی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
Supercritical-pressure heat transfer of hydrocarbon fuel plays an important role in regenerative engine cooling in propulsion systems. Conjugate heat transfer, fuel pyrolysis, and surface coking of the aviation kerosene RP-3 in ribbed tubes are numerically studied at a supercritical pressure of 5 MPa, with consideration of detailed pyrolytic chemical reactions. The rib effects on heat transfer, pressure loss, endothermic fuel pyrolysis, and surface coking are comprehensively examined. Results indicate that a ribbed tube is very effective in enhancing heat transfer of a hydrocarbon fuel at supercritical pressure, particularly in the inlet region, in which the tube wall temperature can be reduced by around 300 K. A ribbed tube surface makes significant impacts on fluid temperature distribution and thus fuel pyrolysis. The enhanced heat transfer leads to higher fluid temperature inside a ribbed tube in the downstream section, in which strong fuel pyrolysis occurs not only in the near-wall region, as in a smooth tube, but also inside the tube. Therefore, the pyrolytic chemical reaction rate of RP-3 increases in the downstream section in a ribbed tube. Owing to the decreased tube wall temperature and decreased species molar concentrations of coking precursors in the near-wall region, pyrolytic surface coking is weakened in a ribbed tube. The thermal performance factor is used to quantify the combined effects of different rib heights on both heat transfer and pressure loss for supercritical-pressure heat transfer of RP-3 in ribbed tubes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 132, October 2018, Pages 209-218
نویسندگان
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