Transient Heat Transfer for Coolant Gas under Flow Decay Conditions Concerning with the Safety Assessment of the Very High Temperature Reactor

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05829
• 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, 教授 (80294263)
• Co-Investigator(Kenkyū-buntansha): 福田 勝哉 神戸大学, 海事科学研究科, 教授 (10127417) ; 柴原 誠 神戸大学, 海事科学研究科, 特命助教 (70628859)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 過渡熱伝達 / 流量急減過程 / 指数関数状減少 / 流量減少時定数 / 強制対流 / ヘリウムガス / 高温ガス炉 / 温度上昇

Outline of Final Research Achievements

In the present study, in order to clarify the transient heat transfer caused by flow decay, the forced convection transient heat transfer for a horizontal cylinder in helium gas under flow decay conditions, was experimentally investigated with a uniform heat generation rate. The flow rate of the helium gas decreased exponentially, according to the designed functions, with different time constants. The surface temperature of the cylinder and heat flux were investigated during the flow decay transient process at various initial flow velocities and flow decay time constants. The transient heat transfer coefficient was also obtained and discussed. Moreover, a three-dimensional numerical simulation was also conducted for this transient heat transfer process. Based on the experimental data and simulation results, the transient heat transfer during the exponentially decreasing flow rate conditions was clarified.

Free Research Field

熱工学