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Computational fluid dynamic analysis of the purification process of the neutrino detector KamLAND.

机译：中微子探测器KamLAND净化过程的计算流体动力学分析。

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摘要

A simplified two-dimensional finite volume axisymmetric mesh was constructed that represented the geometry of the Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) experiment in order to perform a computational fluid dynamics (CFD) analysis of the purification process of the liquid scintillator (LS). 1,000 tons of the LS, contained within a 13 meter-diameter spherical balloon in the center of the detector, is purified in a continuous process where the LS is simultaneously withdrawn from the bottom and replaced at the top of the detector. During this purification process, the interface between the newly purified and unpurified LS is not stratified horizontally as expected, but instead mixing is observed, reducing the efficiency of the process and preventing the desired level of purification throughout the LS.;Using the commercial CFD software FLUENT, the purification process of the experiment was simulated based on the conditions and data previously recorded during the purification phase. The CFD analysis of the experiment was modeled as a transient problem, with flow and heat transfer solved. The phenomenon of natural convection was modeled using the Boussinesq approximation. The volume of fraction (VOF) method was used to track the interaction between the purified and unpurified liquids in the simulation.;The CFD simulation will be used to test proposed improvements to the purification process for future purification programs of KamLAND. The CFD simulation will serve as a guide to test these improvements and improve the efficiency of the process.
机译：构造了一个简化的二维有限体积轴对称网格，以表示Kamioka液体闪烁体抗中微子检测器（KamLAND）实验的几何形状，以便对液体闪烁体（LS）的纯化过程进行计算流体动力学（CFD）分析）。在连续的过程中，将1000吨的LS装在探测器中心13米直径的球形气球中，然后从底部同时取出LS并在探测器的顶部进行替换，以进行连续纯化。在此纯化过程中，新纯化的和未纯化的LS之间的界面未按预期水平分层，而是观察到混合，从而降低了过程的效率并阻止了整个LS所需的纯化水平。;使用商用CFD软件流动剂，根据纯化阶段先前记录的条件和数据模拟了实验的纯化过程。实验的CFD分析被建模为一个瞬态问题，解决了流动和传热问题。自然对流现象使用Boussinesq逼近进行建模。在模拟中，使用了体积分数（VOF）方法来跟踪纯化液和未纯化液之间的相互作用。CFD模拟将用于测试KamLAND未来纯化程序对纯化工艺提出的改进建议。 CFD仿真将作为测试这些改进并提高过程效率的指南。

著录项

  • 作者

    Cossey, Aaron Mitchell.;

  • 作者单位

    The University of Alabama.;

  • 授予单位 The University of Alabama.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2009
  • 页码 79 p.
  • 总页数 79
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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