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Track the trajectories of the evaporating cough drops



Track the trajectories of the evaporating cough drops

Circulatory currents, namely awakened, are observed both in front of the couch (left) and in the back of the listener (right). A drop can be caught up in and trapped upon waking up, dramatically altering its trajectory and destiny. Credit: A * STAR Institute of High Performance Computing

The ongoing COVID-1

9 pandemic has prompted many researchers to study the transmission of water droplets in the air under different conditions and environments. The latest studies are beginning to incorporate important aspects of fluid physics to advance our understanding of viral transmission.


In a new article in Fluid physics, researchers from A * STAR’s High Performance Computing Institute performed a numerical study of droplet scattering using high fidelity airflow simulation. The scientists found that a single 100-micrometer cough drop below a wind speed of 2 meters per second can fly as far as 6.6 meters and even further under dry air conditions due to the evaporation droplets.

Author Fong Yew Leong said: “In addition to wearing a mask, we found that distance from society in general works, as droplet deposition has been shown to decrease per person at least 1 meter away from coughing.” .

Researchers have used computational tools to solve complex mathematical formulas representing airflow and cough droplets in the air surrounding the human body at different wind speeds and when affected. by other environmental factors. They also evaluate deposition profiles on a person at a certain distance.

A typical cough emits thousands of drops over a wide range of sizes. Scientists found that large drops of water settle to the ground quickly due to gravity but can be shone by up to 1 meter of coughing rays even in the absence of wind. Medium-sized droplets can evaporate into smaller, lighter, and more easily generated droplets by the wind, and these droplets fly further.

Track the trajectories of the evaporating cough drops

Droplet dispersion (side view, top view) from one cough to two people 1 m apart at (a) t = 0.52s, (b) t = 1s, (c) t = 3s and (d ) t = 5s. Credit: A * STAR Institute of High Performance Computing

Researchers give a more detailed picture of droplet dispersion when they incorporate viral biological factors, such as the non-volatile content in the droplet evaporation, into the dispersion pattern in the air of the droplets.

Author Hongying Li said: “One drop of evaporation keeps the virus content non-volatile, so the viral load is effectively increased. “This means that the evaporated droplets become aerosols that are more easily inhaled deep into the lungs, causing infection down the respiratory tract, than large droplets that cannot evaporate.”

These findings are also highly dependent on environmental conditions, such as wind speed, humidity and ambient air temperature, and are based on assumptions made from existing scientific literature. about the viability of the COVID-19 virus.

While this study focuses on outdoor airborne transmission in tropical settings, scientists plan to apply their findings to risk assessment in indoor and outdoor environments. where crowds gather, such as halls or theaters. Research can also be used to design environments that optimize comfort and safety, such as hospital rooms that circulate indoor air and transmit germs in the air.


Evaporation is very important for coronavirus transmission when the weather changes


More information:
“The dispersion of the cough droplets evaporating in the outdoor tropical environment” Fluid physics (Year 2020). aip.scitation.org/doi/10.1063/5.0026360

Provided by the American Institute of Physics

Quote: Tracking the flight trajectory of evaporating cough drops (2020, November 3) retrieved November 3, 2020 from https://phys.org/news/2020-11-tracking-flight-trajectory- evaphering-droplets.html

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