Advection and deposition of microdroplets in stagnation point flow

IF 0.7 Q4 THERMODYNAMICS Interfacial Phenomena and Heat Transfer Pub Date : 2023-01-01 DOI:10.1615/interfacphenomheattransfer.2023051336

Md Shamser Ali Javed, Vladimir Ajaev

引用次数: 0

Abstract

We investigate trajectories of microscale evaporating droplets in a stagnation point flow near a wall of a respiratory airway. The configuration is motivated by the problem of advection and deposition of microscale droplets of respiratory fluids in human airways during transmission of infectious diseases such as tuberculosis and COVID-19. Laminar boundary layer equations are solved to describe the air flow while the equations of motion of the droplet include contributions from gravity, aerodynamic drag, and Saffman force. Evaporation is accounted for at both the droplet surface and the wall of the respiratory airway and is shown to delay droplet deposition as compared to the predictions of isothermal models. Evaporation at the airway wall has a stronger effect on droplet trajectories than evaporation at the droplet surface, leading to droplets being advected away by the flow and thus avoiding deposition in the stagnation point flow region.

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滞止点流动中微滴的平流与沉积

我们研究了微尺度蒸发液滴在靠近呼吸道壁的滞止点流动中的轨迹。这种配置的动机是在结核病和COVID-19等传染病传播过程中，呼吸道液体的微尺度飞沫在人体呼吸道中平流和沉积的问题。通过求解层流边界层方程来描述空气流动，而液滴的运动方程包括重力、气动阻力和萨弗曼力的作用。蒸发在液滴表面和呼吸道壁上都被考虑在内，与等温模型的预测相比，蒸发被证明可以延迟液滴沉积。气道壁上的蒸发比液滴表面的蒸发对液滴轨迹的影响更大，导致液滴被气流平流离开，从而避免了在驻点流区沉积。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Interfacial Phenomena and Heat Transfer THERMODYNAMICS-

CiteScore

1.70

自引率

40.00%

发文量

期刊介绍： Interfacial Phenomena and Heat Transfer aims to serve as a forum to advance understanding of fundamental and applied areas on interfacial phenomena, fluid flow, and heat transfer through interdisciplinary research. The special feature of the Journal is to highlight multi-scale phenomena involved in physical and/or chemical behaviors in the context of both classical and new unsolved problems of thermal physics, fluid mechanics, and interfacial phenomena. This goal is fulfilled by publishing novel research on experimental, theoretical and computational methods, assigning priority to comprehensive works covering at least two of the above three approaches. The scope of the Journal covers interdisciplinary areas of physics of fluids, heat and mass transfer, physical chemistry and engineering in macro-, meso-, micro-, and nano-scale. As such review papers, full-length articles and short communications are sought on the following areas: intense heat and mass transfer systems; flows in channels and complex fluid systems; physics of contact line, wetting and thermocapillary flows; instabilities and flow patterns; two-phase systems behavior including films, drops, rivulets, spray, jets, and bubbles; phase change phenomena such as boiling, evaporation, condensation and solidification; multi-scaled textured, soft or heterogeneous surfaces; and gravity dependent phenomena, e.g. processes in micro- and hyper-gravity. The Journal may also consider significant contributions related to the development of innovative experimental techniques, and instrumentation demonstrating advancement of science in the focus areas of this journal.