Experimental and numerical analysis of transient natural convection of water in a high aspect ratio narrow vertical annulus
Experimental and numerical analysis of transient natural convection of water in a high aspect ratio narrow vertical annulus
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DOI：
10.1016/j.pnucene.2018.02.013
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发表时间：
2018-07-01
影响因子：
2.7
通讯作者：
Siddiqui, M. Altamush
中科院分区：
文献类型：
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作者：
Husain, Shahid;Siddiqui, M. Altamush
对蒸馏水在高展弦比窄垂直环管内的瞬态自然对流流动进行了实验分析和数值模拟。在数值模拟方面，建立了CFD模型，利用ANSYS Fluent进行求解，并利用已有数据进行验证。在300w - 1800w的热输入范围内进行了实验分析和数值模拟。环空内径为38 mm，外径为45 mm，环形间隙为3.5 mm，长径比为352，半径比为1.184。本工作的目的是建立一个CFD模型来预测垂直环空中自然对流的动态行为，并通过实验对其进行验证。瞬态时间随环高逐渐增加。随着热输入的增加，可以观察到瞬态周期的减小。计算模型较好地预测了瞬态周期。本文的新颖之处在于建立了一个非常简单的高展弦比垂直环空瞬态自然对流的CFD模型，该模型可用于反应堆堆芯冷却控制系统的设计。
Experimental analysis and numerical simulation of transient natural convection flow of distilled water in a high aspect ratio narrow vertical annulus are presented. For the numerical simulation, a CFD model is developed which is solved using ANSYS Fluent and validated with the previous available data. The experimental analysis and numerical simulation have been performed for a heat input range of 300 W-1800 W. The annulus internal diameter is 38 mm and external diameter is 45 mm that results in the annular gap of 3.5 mm while the aspect ratio is 352 and radius ratio is 1.184. The objective of the present work is to develop a CFD model for the prediction of dynamic behaviour of natural convection in a vertical annulus and validate it with experiments. The transient period seems to increase gradually with annulus height. With an increase in heat input, a drop in the transient period is observed. The transient period is predicted fairly well by the computational model. The novelty of the present work is that a very simple CFD model is developed for transient natural convection in a high aspect ratio vertical annulus that can be used in the design of control system for cooling of nuclear reactor cores.