When moving fast at t intervals. Drops for years and ten meters

One of the basic measures in the fight against coronavirus is safe distance from other people. According to the model of the Belgian-Dutch darkness, it is prudent in sports to keep abruptly at different distances than usual. Unfortunately, the study did not necessarily be completed, because we do not know enough about the virus and the methods of its transmission.

If you followed the recommended recommendations and in the last few weeks you went out into the air for a quick walk, run and ride a bike, mon vs wondered what trail you would leave behind in the air. Are not breath drops otherwise fast than normal?

The answer is not surprising, yes. The movement affects the scattering of droplets from our breath, and it is very pronounced. This is at least the result of a model compiled by experts from universities in Leuven, Belgium and Eindhoven, the Netherlands.

The model contained

The model contained several million cells with a special emphasis on the area around st. So the beeches float around them in the picture.

Let’s not go to slm, let me make a few remarks that will allow me to interpret the result more clearly. The work is part of a group of vdc, most of whom are dedicated to aerodynamic modeling. He did not experiment with the new coronavirus SARS-Cov-2 or any other virus. They did not find out whether the droplets they model could actually contain coronavirus.

It is a practically oriented work, which can give the simplest possible advice in a situation where there is little reliable information. The authors came out of an extremely simplistic premise: viruses with small droplets around me, so it’s good to avoid them.

Safe distance as a basis for prevention

In most countries, the basic protection is distance from other people. In most parts of the world, it is recommended and sometimes even concluded that people should be separated by more than 1.5 meters if they can. It is based on the observation, according to which in droplets from our breath (very roughly one droplet with dimensions from micrometer plates in) fall to the ground to a distance of about 1.5 meters from the center from which they took.

The authors modeled exclusively the movement of droplets with dimensions of 40 and 200 micrometers, which are considered to be very dangerous in terms of transmission. It is certainly not perfect, because the movement of various large droplets in the air takes place very differently. For example, those men (units of micrometer) stay in the air according to, but whether and how the virus is affected by them is still a matter of professional debate.

The authors therefore ask themselves whether the droplets are the right size when moving differently. The result is as common sense would suggest. During the fast movement, the droplets from our breath move according to, in a small dog, which is roughly close to the shoulders of sports. It is a few meters long and a few meters meter, bad for movement speed.

Speed ​​of movement and bon vtr play a role

When walking fast, according to the author, the dog behind the pedestrian is about five meters long. At bhu speed of 15 kilometers per hour it is about 10 meters. When riding a bike speed of 30 km / h about 20 meters.

If there is a strong wind blowing, you should adapt to the situation. Simply put, don’t be close to the wind from the others. Let’s add that the cars did not model the effect of the roughness or respirator, so move them with them as a reasonable measure.

Kapi movement

The movement of droplets exhaled through the bc at a speed of about 15 km / h according to the simulations of the Belgian-Dutch group. When viewed from above, it can be seen that the bar behind the tin is relatively short. The droplet size in the simulation ranges from 40 to 200 micrometers (the color is from blue, 40 micrometers, to red, 200 micrometers).

Let’s repeat, on the other hand, that the study does not necessarily mean that even a cyclist around him is spewing a virus as they move. Authors of the proverb that their work does not result in epidemiological findings. There has never been a case of transmission while running and riding a bike.

On the other hand, the hypothesis is supported by some names (as you would probably expect, with the amount of drops in the breath growing), so according to the author it is better to be careful not to be careful. Moving outside is all that is needed. In the answers to the questions, the winners state that they definitely recommend it.

The simulation has, of course, a number of weaknesses that the authors themselves admit. We don’t have enough enough to make definitive twists. Take this only as a very careful recommendation, which could make decision-making easier for anyone who wants to move outside even during a pandemic. In addition, the diameter of the spacing cannot be affected.