Shock wave-liquid interface interactions

冲击波与液体界面的相互作用在各种自然过程和技术过程中都会遇到，从水下爆炸、液滴破碎和雾化到地震勘探、水力冲击技术和油藏中石油的流动。在模拟这样的过程中，有许多未回答的基本问题，特别是由于极端的多尺度性质的现象在空间和时间，这还没有考虑到在以前的研究中忽略液体的粘度和表面张力。该研究计划的主要目标是实现对冲击波-液体界面相互作用物理学的坚定和定量理解，特别关注粘度和表面张力的影响。考虑到这些影响与可压缩性的相互作用在很大程度上是未探索的，为了取得重大进展，需要物理和数值实验沿着分析模型。有了加拿大创新基金会资助的设备，NSERC的发现资助将使拟议研究的实验和理论部分成为可能。在实验方面，将使用粒子图像测速仪、激光多普勒测振仪和高速红外摄影对冲击波-液体界面相互作用的现象进行综合研究，包括流体动力学、声学和热力学场。结合起来，这些技术提供了强大的平台，旨在了解其基本的物理方面，在广泛的实验条件下的冲击波界面相互作用的创新研究。在理论方面，作为长期目标的一部分，目标是：（a）通过对纳维尔-斯托克斯方程进行系统的多尺度分析，建立全面的分析模型;（B）制定适用于这些复杂现象的可靠的数值方案。在实践方面，目前的努力还应有助于提高各种技术和应用的效率，从新材料的合成、等离子体场的产生和医疗（例如治疗肾结石、肌腱和骨骼）到石油工程和超高速发射器，因为它们都依赖于在具有液体界面的系统中使用冲击波。这项工作借鉴了PI在理论和实验界面流体动力学方面的独特综合专业知识。实验将在PI实验室进行，基础设施由阿尔伯塔大学物理系提供。

Shock waves interacting with liquid interfaces are encountered in a variety of natural and technological processes ranging from underwater explosions, drop fragmentation and atomization to seismic survey, hydro-impact technology, and mobilization of oil in reservoirs. In modeling such processes there are many unanswered fundamental questions arising, in particular, due to the extreme multiscale nature of the phenomena both in space and time, which has not been taken into account in previous studies neglecting viscosity and surface tension of the liquid. The key objective of this research program is to achieve a firm and quantitative understanding of the physics of shock wave-liquid interface interactions with the particular focus on the effects of viscosity and surface tension. Given that the interplay of these effects with compressibility is largely unexplored, a synergy of physical and numerical experiments along with analytical models is required in order to make significant progress. With the equipment funded by the Canadian Foundation for Innovation, this NSERC Discovery grant will enable both the experimental and theoretical parts of the proposed research. On the experimental side, an integrated study of the phenomena of shock wave-liquid interface interactions including hydrodynamic, acoustic, and thermodynamic fields will be performed using particle image velocimetry, laser Doppler vibrometry, and high-speed infra-red photography. Combined, these techniques provide powerful platforms for an innovative study of shock wave-interface interactions aimed at understanding their fundamental physical aspects in a wide range of experimental conditions. On the theoretical side, as a part of the longer-term objective, the goals are (a) to construct comprehensive analytical models through systematic multiple-scale analysis of the Navier-Stokes equations and (b) to develop reliable numerical schemes adequate for these complex phenomena. On the practical side, the present effort should also contribute to improving efficiency of various technologies and applications ranging from synthesis of new materials, production of plasma fields, and medical therapies (e.g. to treat kidney stones, tendons, and bones) to petroleum engineering and hypervelocity launchers, since they all rely upon the usage of shock waves in systems with liquid interfaces. This work draws on the PI's unique combined expertise in both theoretical and experimental interfacial fluid dynamics. The experiments will be performed in the PI's laboratory, the infrastructure for which is provided by the Physics Department at the University of Alberta.