Predicting spray carry over through computational modelling

通过计算模型预测喷雾残留

• 批准号: 1947862
• 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-1947862
• 关键词: Predicting; spray; carry; over; through

Spraying is ubiquitous and finds application within delivery of materials (e.g. paints, agrochemicals, pharmaceuticals, personal-care products) to surfaces (e.g. crops, fabrics, skin). The spraying process is complex and includes physics around (i) a breakup of a (formulated) liquid from a continuous stream on leaving the spray-nozzle into (ii) discrete droplets (the spray) (iii) evaporation of propellant (iv) transport of droplet/particles to surfaces and (v) impact, adhesion or bounce of droplets/particulate into the evolving flow that carries material away from the surface. A modelling approach is proposed which will allow a better understanding of the controlling parameters that describe the fate of droplets/particles sprayed onto surfaces. The proposed approach will focus on personal care products where carryover of particulates into the air can cause respiratory discomfort. A particular feature of this work is that the spray is a complex formulated product and at the point of impact will be a mix of particulates and oils that form the functional coating, with the carrier fluid responsible for the propellant having evaporated from the material. Also, the shape of the surface to which the spray is directed is relatively complex and will also be responsible for how the airflow (and thus the transport) evolves.

喷洒无处不在，并在材料（如油漆、农用化学品、药品、个人护理产品）到表面（如作物、织物、皮肤）的输送中得到应用。喷射过程是复杂的，包括以下方面的物理问题：(i)（配方）液体在离开喷嘴时从连续流中分解成（ii）离散的液滴（喷雾）（iii）推进剂的蒸发（iv）液滴/颗粒向表面的运输以及(v)液滴/颗粒撞击、粘附或反弹进入不断发展的流动，将物质从表面带走。提出了一种建模方法，可以更好地理解描述喷射到表面上的液滴/颗粒命运的控制参数。拟议的方法将重点放在个人护理产品上，这些产品的颗粒携带到空气中会导致呼吸不适。这项工作的一个特点是，喷雾是一种复杂的配方产品，在撞击点将是形成功能涂层的颗粒和油的混合物，负责推进剂的载体流体已从材料中蒸发。此外，喷雾所指向的表面形状相对复杂，也将对气流（以及由此产生的运输）的演变负责。