Modeling the Enceladus Plumes: Source Mechanisms and the Possibility of Liquid Water

土卫二羽流建模：来源机制和液态水的可能性

• 批准号: 0808148
• 负责人: Andrew Ingersoll
• 金额: $ 40.76万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0808148&HistoricalAwards=false
• 关键词: Modeling; Enceladus; Plumes; Source; Mechanisms

AST-0808148IngersollThis project will develop a comprehensive numerical model of the formation and dynamical evolution of the Enceladus water vapor and ice particle plumes (EPs). Since the nature of the reservoir that produces EPs is hotly debated, including eruptions from chambers of liquid water, sublimation and venting of hydrate clathrate, and vapor diffusion through ice pores, the model proposed here will simulate different origins and allow comparison to available observations. The model describes the dynamics of compressible gas and of boiling liquids expanding through narrow channels, particle growth in the expanding vapor, condensation and sublimation on the walls, heat transfer and vapor diffusion in the surrounding ice, and feedback between these different elements. This work will advance our knowledge of the subsurface structure of Enceladus and of processes occurring on icy moons elsewhere in the solar system, producing the first complete model of the EP dynamics and thermodynamics.The search for liquid water has broad societal impact by capturing the imagination of the public and of young people who might be considering scientific careers. Enceladus is a potentially important island of habitability: this project tests the hypothesis that liquid water exists below the surface and at what depth it might exist, and whether there is a source of chemical energy to support life.

英格索尔这个项目将开发一个关于土卫二水汽和冰粒羽流(EPs)形成和动态演化的综合数值模式。由于产生EPs的储水池的性质存在着激烈的争论，包括液水室的喷发、水合物笼合物的升华和喷发以及水蒸气在冰孔中的扩散，因此这里提出的模型将模拟不同的来源，并与现有的观测结果进行比较。该模型描述了可压缩气体和沸腾液体在狭窄通道中膨胀的动力学，膨胀蒸汽中的颗粒生长，壁面上的凝结和升华，周围冰中的热传递和蒸汽扩散，以及这些不同元素之间的反馈。这项工作将增进我们对土卫二地下结构和太阳系其他地方冰冷卫星上发生的过程的了解，产生第一个完整的EP动力学和热力学模型。寻找液态水通过激发公众和可能考虑从事科学事业的年轻人的想象力而产生广泛的社会影响。土卫二是一个潜在的重要宜居岛：这个项目测试了液态水存在于地表以下及其可能存在的深度的假设，以及是否存在维持生命的化学能源。