What is the Bayriolis force, the Creolis force mass flow meter

Coriolis force.

Understanding the History The Coriolis force of linear motion of particles in a rotating system is based on Newtonian mechanics. In 1835, the French meteorologist Coriolis proposed that in order to describe the motion of a rotating system, an imaginary force needed to be introduced into the equation of motion, which was the Coriolis force. After the introduction of the Coriolis force, one can simply deal with the equations of motion in a rotating system in the same way as the equations of motion in an inertial frame, which greatly simplifies the way a rotating system is handled.

Since the Earth itself is a gigantic rotating system, the Coriolis force soon found a successful application in the field of fluid motion.

Coriolis force in physics.

The Coriolis force comes from the inertia of the motion of the object, and the particle point that moves in a linear line in the rotating system, due to the action of inertia, has a tendency to continue to move along the original direction of motion, but because the system itself is rotating, after a period of motion, the position of the particle in the system will change, and the direction of its original motion trend, if observed from the perspective of the rotating system, will deviate to a certain extent.

As shown in the figure on the right, when a particle moves in a straight line relative to an inertial frame, its trajectory is a curve relative to the rotating system. Based on the rotation system, we believe that there is a force that drives the trajectory of the particle to form a curve, and this force is the Coriolis force.

According to the theory of Newtonian mechanics, the tendency of the linear motion of the particle to deviate from the original direction is attributed to the action of an applied force, which is the Coriolis force, using the rotating system as a frame of reference. From the point of view of physics, the Coriolis force, like the centrifugal force, is not a real force, but the embodiment of inertial action in a non-inertial frame.

The formula for calculating the Coriolis force is as follows:

where is the Coriolis force; m is the mass of the particle; is the velocity of the movement of the particle; is the angular velocity of the rotating system; Represents the cross-product of two vectors.

The effects of the Coriolis force.

In the field of earth sciences.

Due to the existence of rotation, the Earth is not an inertial frame, but a rotational frame of reference, so the motion of particles on the ground is affected by the Coriolis force. The geostrophic deflection force in the field of earth science is a component of the Coriolis force along the Earth's surface. Geostrophic deflection forces help explain geographical phenomena such as the fact that one side of a river channel tends to wash more than the other.

An inertial force exerted by the rotation of the earth on an object moving on the surface of the earth. The root cause of floods and crazy hurricanes is the result of the Coriolis force.

Upstairs pretty much right!

Overall. It can be said that it is the gravitational force of the earth, the relative centripetal force, the centrifugal force of the object, etc.

Combined force.

Hello, the mass flow meter is measured by the fluid through a rotating or vibrating measuring tube, the flow of the fluid in the pipeline is equivalent to linear motion, the rotation or vibration of the measuring tube will produce an angular velocity, because the rotation or vibration is driven by the applied electromagnetic field, with a fixed frequency, so the Coriolis force of the fluid in the pipeline is only related to its mass and movement velocity, and the mass and motion velocity, that is, the product of the flow velocity, is the mass flow rate that needs to be measured, Thus, by measuring the Coriolis force experienced by the fluid in the pipe, its mass flow can be measured.

The same principle applies to powder dosing scales, where powders can be approximated as fluid handling.

Measure the density of the fluid, measure the temperature, measure the flow rate, and then obtain the mass flow rate according to the above.

The Creolis force is the force that must be added when considering a non-inertial frame as an inertial frame.

This force is related to changes in the frame of reference.

Coriolis effect, etc., as its own source of force; Astrophysics uses the principle of "the earth rotates on its own" to explain the motion of other planets and celestial bodies; Philosophers have summed up this as "things." Each of these questions will be addressed in the next part, which will dispel any doubts we may have about the principle that the solar wind causes the Earth to rotate.

This phenomenon is very complex, and there is still no perfect and unified theoretical framework for the phenomenon of fluid mechanics. The phenomenon you see can now be explained from a variety of different angles. The most reminiscent of this is the surface wave phenomenon, which is the wave phenomenon of water.

This is the result of the combined action of gravity and inertial forces of water under the action of gravity. For a theoretical explanation of this part, please refer to the surface wave section of the textbook "Fluid Mechanics", because the theory is very complex, so it is impossible to go into detail here.

2.The phenomenon you see also has something to do with turbulence. At present, the judgment of whether it is turbulent or not is mainly based on the Reynolds number.

The definition of the Reynolds number is the ratio of the inertial force to the viscous force, and when the Reynolds number is greater than 2300, it is turbulence. Most of the water that can be seen on a daily basis is turbulent.

3.The phenomenon you see can also be explained by stability theory. This is because it is possible for water to remain in a stable state without fluctuations due to gravity alone.

But when disturbed, stability is disrupted, and fluctuations occur. In daily life, there are inevitably various disturbances, such as artificial shaking, the action of wind, etc., so the liquid will fluctuate.

4.Milk is a non-Newtonian fluid and is much more viscous than water, so it will not be the same as water. These can be partially explained in Fluid Mechanics.

5.I have also used CFD software to simulate the flow of fluids, for example, with fluent software, you can simulate the fluctuation of water, please refer to the "Computational Fluid Dynamics" textbook, you can prove that this is in line with the principles of fluid mechanics.

6.When water flows out of a hole below, it also rotates due to the influence of the Coriolis force of the Earth's rotation, which is explained in the textbook Theoretical Mechanics.

Have you ever observed that when you drain the water from the pool, the water will flow counterclockwise into the sewer? If you have been kidnapped abroad and see the water in the pool flowing clockwise, it is a sign that you have been kidnapped to the Southern Hemisphere. (Professional).

You're going to do this now.

It's gravity at work when the Earth rotates. Ha ha.

The change in the water level in the bottle produces a pressure change that causes the water to flow unevenly.

There is turbulence inside the liquid column, but it is not the cause of this phenomenon.

It depends on the shape of the outlet].

The liquid is dispersed to both sides by gravity, and then constrained by the outlet, turning to form a strange-shaped liquid column in the middle, and the constraint conditions remain unchanged, and the liquid column will not change.

When the water flows in the river channel, the resistance of the water on both sides of the river bed is different, such as the bottom of the river bed, the pressure is large, the resistance is large, and the middle of the surface, the friction is the least, and the stone under the bottom of the river bed is different from the back of the water surface, so that the water flow is different everywhere.

During the flow process, it is blocked by the underlying surface, and there is the thrust of water behind it, and the two forces are uneven and vibrate, and the milk is blocked by the bottle mouth.

The temperature distribution of the liquid is not uniform, forming a thermodynamic circulation.

That's because water can carry waves.

There will be waves in the still-flowing lake, and there will be waves in the flowing water.

For example, the river, in addition to flowing longitudinally, also has horizontal waves, and when it reaches the river, it will reflect back.

Milk is more obvious because it has a color, whereas water is transparent.

It seems to be related to the viscosity of the liquid, and fluid mechanics requires advanced algebraic support, so difficult!

The turbulence phenomenon should be related to the structure of the river bank.

Do you know about water waves? It's a combination of transverse and longitudinal waves, and it's very complicated!