Heat Transfer Enhancement of Twisted Heater and Thermal Hydraulics in a Very High Temperature Gas-cooled Reactor

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560231
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Kobe University
• Principal Investigator: LIU Qiusheng 神戸大学, 海事科学研究科(研究院), 教授 (80294263)
• Co-Investigator(Kenkyū-buntansha): FUKUDA Katsuya 神戸大学, 海事科学研究科, 教授 (10127417)
• Research Collaborator: PETERSON Per F. 米国カリフォルニア大学, バークレー校(UC Berkeley), 原子核工学科教授
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 対流熱伝達 / 伝熱促進 / ねじり / 非定常 / ヘリウムガス / 熱流動特性 / 数値シミュレーション / 超高温ガス炉

Outline of Final Research Achievements

The knowledge of heat transfer enhancement for a twisted heater is important for the high performance design of very high temperature reactor (VHTR). In this study, forced convection transient heat transfer for helium gas at various pitches of a twisted plate was experimentally studied. An enhancement in the heat transfer coefficient was clarified. It was clarified that the convective heat transfer for a small pitch heater is higher than that for a large pitch heater. Based on the experimental data, empirical correlation of heat transfer for twisted plate was obtained. Forced convection heat transfer for a twisted plate was also numerically studied. The mechanism for heat transfer enhancement was clarified by comparing the numerical results with experimental data. Moreover, numerical simulation was conducted for the thermal hydraulic analysis in the VHTR core. Effects of bypass gap size and cross gap size on temperature and coolant mass flow rate distribution were clarified.

Free Research Field

熱工学