Aerosol generation from liquid droplet impact on solid surfaces

液滴撞击固体表面产生气溶胶

• 批准号: 1971438
• 金额: --
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1971438
• 关键词: Aerosol; generation; liquid; droplet; impact

Liquid jets are widely encountered from printing to 'big industry' which use jets for a range of applications including decontaminating surfaces (buildings, reactors etc.). In most applications Rayleigh instability of the liquid jet promotes breakup of the jet into sub-millimetre droplets which then impact on the solid surface resulting in either droplet spreading, rebounding or breakup. The outcome of a droplet impacting on a solid surface is dependent on the surface (wettability, roughness) and fluid (viscosity, surface tension) properties, and the droplet impact velocity. An undesirable effect in most applications is droplet splashing and the formation of micron-sized aerosol droplets which become mobile and contaminate the surrounding environment. We will study the generation of aerosol droplets (droplet size and number) from single, millimetre-sized droplets impacting on a solid surface. Generation and mobility of the aerosol droplets will be investigated as a function of the fluid viscosity (chemical additives), interfacial rheology, and velocity of an air flow perpendicular to the droplet trajectory. Routes to minimize aerosol generation while maintaining high impact velocities will be explored. The project will include both experimental and computational research.

从印刷到“大工业”，液体射流被广泛应用于包括表面净化（建筑物、反应堆等）在内的一系列应用。在大多数应用中，液体射流的瑞利不稳定性促进射流分裂成亚毫米的液滴，然后液滴冲击固体表面，导致液滴扩散、反弹或分裂。液滴撞击在固体表面上的结果取决于表面（润湿性、粗糙度）和流体（粘度、表面张力）性质以及液滴撞击速度。在大多数应用中，不期望的效果是液滴飞溅和形成微米尺寸的气溶胶液滴，其变得移动的并污染周围环境。我们将研究气溶胶液滴的产生（液滴大小和数量）从单一的，毫米大小的液滴撞击在固体表面上。气溶胶液滴的生成和流动性将作为流体粘度（化学添加剂），界面流变学，和垂直于液滴轨迹的气流速度的函数进行研究。将探索在保持高撞击速度的同时尽量减少气溶胶产生的途径。该项目将包括实验和计算研究。