Today's global problems are undoubtedly energy issues, because there are countless wars caused by energy, and the future competition between countries is mainly energy warfare. Therefore, it is important to study the viscosity of petroleum. The viscous test data can determine the level of oil and distinguish its purity. This can determine the oil content in the test area to determine whether to mine. This saves resources and does not waste manpower and material resources in areas where there is no use value. The quality of today's social goods is also a matter of great concern. Some audio is mixed with other harmful components, and the viscosity of the finished product of this project can also be used to judge the true and false.
Liquid viscosity overviewWhen the liquid is in a steady flow, it is generally a stable laminar flow, that is, the liquid flow state on the same level is completely the same. If the flow velocity between the inner layers of the liquid is different, then a relative movement between the adjacent layers inside the liquid will occur, and an interaction force will be generated between the two layers inside the liquid, called viscous force, as measured. A physical quantity of this viscous force is called viscosity [25].
Viscosity is an inherent property of liquids. The size of liquids varies with the type of liquid. At the same time, the temperature and pressure of the external environment also affect the viscosity of the liquid.
All liquids are viscous and this is illustrated by many phenomena in life. For example, when a container filled with liquid is rotated about its vertical axis, the liquid inside it will also rotate, which is precisely because the liquid is subjected to the viscous force between the liquid and the container at the wall of the container. of. First, the rotation of the container causes a layer of liquid in the immediate vicinity of the container wall to follow the viscous force. Then, a layer of liquid in the immediate vicinity of the container wall is rotated by a layer of liquid adjacent thereto due to the viscous force. In this way, all the liquid in the container will rotate with the viscous force. Only the inner layer of the liquid layer rotates at a lower speed.
Again, the same is true for liquids flowing in the pipeline. Since the wall of the pipe is stationary, a thin layer of liquid in close proximity to the wall of the pipe is also at rest, and this layer of liquid also constrains the flow of liquid adjacent to it. Therefore, the liquid flowing in the pipe is divided into a myriad of thin layers. As the distance of the thin layer from the pipe wall is closer, the flow velocity of the liquid is slower, and the velocity distribution is shown in Figure 2-1.
Figure 2-1 Schematic diagram of the velocity distribution of the liquid layer in the pipeline
Main measurement principleBased on the above principle, I have adopted a liquid viscosity measurement method based on electromagnetic induction. The method is simple in structure, easy to implement, and strong in anti-interference ability, and is suitable for on-line measurement in the field environment. It is mainly composed of a control measuring circuit, a columnar stainless steel container and two annular electromagnetic coils. In the columnar stainless steel container, there is a cylindrical high remanence high temperature resistant permanent magnet as a moving piston. This can provide a large force between the electromagnetic coil and the piston, thereby improving the measurement sensitivity of the instrument and increasing the measurement range, and can reduce the influence of impurities in the sample on the measurement and improve the measurement accuracy of the instrument.
The working principle of the method is that an electromagnetic coil is respectively installed at both ends of the measuring chamber, and a cylindrical high remanence high temperature permanent magnet is used as the piston inside the measuring chamber. When the "B" coil is activated, the piston is moved by the electromagnetic force to move toward the measurement chamber B end. The liquid at the inlet that is intercepted at this time is forced to flow around the piston. The more viscous the liquid, the slower the piston moves. The "A" coil is used to monitor the movement of the piston during this process. Once the piston reaches the B end of the measurement chamber, the upper "A" coil is activated and the "B" coil begins to monitor. During this process, liquid is continuously introduced around the piston. At the same time, the "B" coil monitors the piston movement. When the piston approaches the measuring chamber A end again, the "B" coil is reactivated and the previous process begins. The time during which the piston reciprocates is measured by the signal acquisition and processing unit, and the viscosity of the liquid can be calculated from a mathematical model of the viscosity of the liquid and the reciprocating time of the piston. Figure 2-3 is a schematic diagram of the structure of the method.
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