In the shower with the shower curtain, people often find such a phenomenon: the outside of the shower curtain is like a pair of invisible hands always pushing, the cold shower curtain will always turn inward and stick to the person. It is very troublesome for people who take a bath. What is the cause of this problem?
In 1938, this annoying phenomenon was interpreted as being formed by the movement of a steam stream. The hot water that is washed from the nozzle during the shower generates hot air, and the molecular motion of the hot air is intense, and the ability to diffuse around is strong, so the density is smaller relative to the surrounding air. Air with a small density will rise. As the hot air continues to rise, the air at the bottom of the bathtub is reduced, the air pressure is lowered, and the cold air outside the bathtub is taken in, thus pushing the shower curtain to roll into the bathtub.
However, the principle of this hot air was later questioned. Those who are used to taking a cold bath pointed out that when showering with cold water, the so-called steam air movement no longer exists, but the shower curtain is still my own. So, what the hell is this all about? What have we ignored?
David Schmidt, a professor of mechanical engineering at the University of Massachusetts, decided to conduct some tests on the cold bath theory. He specially created a bathroom computer model that included a showerhead, a bathtub, and a shower curtain hanger. As a result, David found that the water flow in the shower would drive the surrounding air to form a “lateral dust wind”. It is a “mini” tornado, where the water flows to the ground, where the person stands, the “mini storm”. Eyes. Simply put, because of the impact of the water flow, a low-pressure center is formed on the ground, which is the wind eye, and the high-pressure airflow around the wind eye moves toward the middle low pressure. The airflow at the wind eye is increased and cannot spread outward, so the airflow can only rise. In this way, the low-pressure wind eye will continuously suck the outside high-pressure airflow to the side, and the suspended shower curtain will be pushed to the wind eye by the high-pressure air outside the curtain, that is, where the person stands when showering.
The physics textbook writer Peter Istanville did further experiments in an Australian motel room. At that time, he adjusted the height of the shower curtain, the water temperature, and the distance between the shower head and the shower curtain. The conclusions were not only confirmed by Professor David's research, but also further revealed that hot showers and cold showers were taken. The effect is not exactly the same. Because the hot water in the shower not only causes the wind eye, but also produces steam air movement, so the "bath curtain effect" caused by hot water is more obvious than cold water.
In addition, Peter also laughed, if you want to shower, the shower curtain can actively get close contact with you, you have to adjust the distance between the nozzle and the shower curtain. Otherwise, if the water is too far away from the shower curtain, the shower curtain will be far away from the “storm center”; and if the water is too close to the shower curtain and close to the “safe zone” of the eye, then the “bath curtain effect” will Sneak away silently.
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