Thermo-hydraulic instability of liquid-vapour interface in porous media

多孔介质中液-汽界面的热水力不稳定性

• 批准号: 261208-2007
• 负责人: Kaya, Tarik
• 金额: $ 1.31万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=364998
• 关键词: Thermo; hydraulic; instability; liquid; vapour

The liquid-vapour phase change in porous media plays a vital role in a wide variety of engineering applications. Although significant progress has been made in the past, some elements of phase-change phenomena are not well understood despite many years of extensive research. One of the areas where there is currently a need for further research is liquid-vapour interface instabilities of the capillary-driven flows. The interface instabilities can lead to performance anomalies and mechanical damage of heat transfer equipment by altering the phase-change process. The proposed research project aims to study thermo-hydraulic instabilities encountered during the liquid-vapour phase change process in porous media through experimental and numerical investigation. One of the main goals of the project is to expand a previously developed mathematical model to be able to suggest design improvements to eliminate or remedy the performance anomalies.A better understanding of the underlying physical mechanisms of these instabilities would be of great importance for several technological applications (fuel cells, nuclear reactors, energy transfer, chemical processing, etc.). An important application area of growing importance is two-phase capillary-pumped heat transfer devices. These devices are used to transfer excess heat from a heat-producing component such as a microprocessor in a computer or an electronic instrument in a spacecraft, while maintaining the temperature within a specified range. The advantages of these devices over conventional cooling techniques include simplicity, lack of moving parts, and the ability to transfer large amounts of heat over long distances. In the absence of better mathematical models, advancement in this technology will remain difficult.

多孔介质中的液-汽相变在各种工程应用中发挥着至关重要的作用。尽管过去已经取得了重大进展，但经过多年的广泛研究，相变现象的一些要素仍未得到很好的理解。目前需要进一步研究的领域之一是毛细管驱动流的液-汽界面不稳定性。界面不稳定性会通过改变相变过程导致传热设备的性能异常和机械损坏。拟议的研究项目旨在通过实验和数值研究来研究多孔介质液-汽相变过程中遇到的热水不稳定性。该项目的主要目标之一是扩展先前开发的数学模型，以便能够提出设计改进建议，以消除或补救性能异常。更好地了解这些不稳定性的潜在物理机制对于多种技术应用（燃料电池、核反应堆、能量传输、化学加工等）非常重要。两相毛细管泵传热装置是一个日益重要的应用领域。这些设备用于传递来自发热部件（例如计算机中的微处理器或航天器中的电子仪器）的多余热量，同时将温度保持在指定范围内。与传统冷却技术相比，这些设备的优点包括简单、没有移动部件以及能够长距离传递大量热量。在缺乏更好的数学模型的情况下，这项技术的进步仍然很困难。