کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8918682 | 1642856 | 2018 | 35 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Plenum-to-plenum natural convection heat transfer within a scaled-down prismatic modular reactor facility
ترجمه فارسی عنوان
انتقال گرما حرارت طبیعی پلاسما به پانوموم در یک راکتور مجهز به پریماسیال کم عمق
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کلمات کلیدی
پودر طبیعی راکتور مداری پرسیماس، هلیوم خنک شد ضریب انتقال حرارت، پروب ضریب انتقال حرارت پیشرفته
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
مهندسی انرژی و فناوری های برق
چکیده انگلیسی
Multiphase Reactors Engineering and Applications Laboratory (mReal) at Missouri University of Science and Technology (S&T) has developed a natural convection heat transfer test facility with one riser and one downcomer between two plena to investigate loss of flow accident scenario (LOFA) for a prismatic very high temperature reactor (VHTR). Using advanced heat transfer coefficient probe and T-thermocouples (1.6â¯mm), this paper reports the effect of the outer surface temperatures of the upper plenum and downcomer channel (278.15, 288.15, 298.15, and 308.15â¯K) on the intensity of natural circulation during LOFA with helium at 413.685â¯kPa. The results showed that there is a reduction in the centerline temperature of â¼10.14% and inner wall surface temperatures of â¼7.4% along the riser channel with decreasing upper plenum and downcomer temperatures from 308.15â¯K to 278.15â¯K. A reversal in the direction of heat transfer is observed close to the exit of the riser channel (Z/Lâ¯=â¯0.773) for outer surface temperature 288.15, 298.15, and 308.15â¯K due to the end effect. It is worth mention that, the negative signals of heat fluxes are observed along the downcomer channel for all operating conditions, which confirms heat removal from helium and a downward flow along the downcomer channel, hence establishment of natural circulation. The results also showed a gain in the values of heat transfer coefficients along the riser channel with decreasing the outer surface temperature which is consistent with the literature. In comparison to the literature with air as coolant, the current results showed the role of helium on the thermal performance of natural circulation loop in terms of co-circulation of plumes and end effects.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermal Science and Engineering Progress - Volume 7, September 2018, Pages 288-301
Journal: Thermal Science and Engineering Progress - Volume 7, September 2018, Pages 288-301
نویسندگان
Salman M. Alshehri, Ibrahim A. Said, Muthanna H. Al-Dahhan, Shoaib Usman,