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Comparison between experimental data and numerical modeling for the natural circulation phenomenon

机译：自然循环现象实验数据与数值模拟的比较

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The study of natural circulation phenomenon has been object of crescent interest in scientific community in recent years. The new generation of compact nuclear reactors uses natural circulation of the fluid as a residual heat removal cooling system in case of accident or shutdown. The objective of this paper is to present a comparison between experimental data and numerical simulation results for the natural circulation phenomenon in single and two-phase flow regime. Experimental data were obtained from a circuit built with glass tubes, through which thermal hydraulic phenomenon visualization was possible. The circuit is composed of an electric heater as the heat source, a heat exchanger as the heat sink and an expansion tank to accommodate fluid density changes. Instrumentation data acquisition is performed through thermocouples and pressure meters, and controlled by a computer interface developed using LABVIEW. Numerical modeling and simulations were done with the thermal hydraulic code RELAP5, which is widely used for this purpose. The cyclic reverse flow observed in the circuit was well represented by the numerical model. The comparison demonstrated that the numerical simulations are very close to the experimental data.
机译：近年来，自然循环现象的研究一直是科学界新月兴趣的对象。新一代紧凑型核反应堆利用流体的自然循环作为事故或停机时的余热去除冷却系统。本文的目的是对单相和两相流动状态下自然循环现象的实验数据和数值模拟结果进行比较。实验数据是从装有玻璃管的电路中获得的，通过该电路可以看到热工现象。该回路由作为热源的电加热器，作为散热器的热交换器和容纳流体密度变化的膨胀箱组成。仪器数据的采集通过热电偶和压力计完成，并通过使用LABVIEW开发的计算机界面进行控制。使用热液压代码RELAP5进行了数值建模和仿真，该代码已广泛用于此目的。数值模型很好地表示了在回路中观察到的循环逆流。比较表明，数值模拟与实验数据非常接近。

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