What is a non Newtonian fluid and what are its properties?

It is a kind of substance that has viscosity, and then the viscosity will change, the pressure increases, the viscosity increases, and sometimes it becomes solid, and the solid hardness is sometimes particularly strong, such as lipstick, pulp, which is inelastic flow.

Non-Newtonian fluids are a special physical component. Its characteristic is that it has a very large viscosity, and the viscosity will change accordingly, when it is under pressure, it will produce a corresponding annual pressure that will continue to increase, and it will become a solid under great pressure, and the hardness is very high.

It is a liquid that flows, but its annual variation depends on the ability to apply, and it can also be treated as blood; It has the characteristics of rheology, wonder, turbulent drag reduction, climbing rod effect, jet expansion, etc.

This is a special fluid that can change its viscosity according to the force applied by the outside, this fluid will be strong when it is strong, and weak when it is weak, and the viscosity of the fluid will change according to the force applied by the outside. Sometimes it even becomes a solid.

To put it simply, without talking about his physical concepts, most pure liquids and light oils such as water and alcohol.

Low-molecular-weight compound solutions and low-velocity flowing gases are Newtonian fluids; Polymers.

Concentrated solutions and suspensions are generally non-Newtonian fluids.

A non-Newtonian fluid, which is simply a fluid (i.e., it basically flows), has a viscosity that varies depending on the force you exert on it. A good example of a non-Newtonian fluid is blood.

Non-Newtonian fluids do not have the shear stress between the fluid and the fluid layer, which is characteristic like the deformation rate.

is proportional, so this fluid does not have the linear characteristics of the stress-velocity gradient. Blood, paint, polymer solutions, lipsticks, pulp, etc., are all non-Newtonian fluids. Said that it could be made into body armor.

Even if you can stop the bullet, but the impact of the bullet.

It's not comfortable, and what is used to wrap non-Newtonian fluids will not be penetrated.

Use a basin cornmeal to make an anti-Newtonian fluid, which is as hard as a rubber sheet. I said this thing is really an artifact for making armor. Non-Newtonian fluids that do not have a characteristic like the deformation rate are proportional to the shear stress between the fluid layers, so this fluid does not have a linear feature of the stress-velocity gradient.

Blood, paint, polymer solutions, lipsticks, pulp, etc., are all non-Newtonian fluids.

Wrap all the clothes on the feet, divide the rest of the clothes into sheets, and take a piece of clothing every step forward, and you should be able to walk out slowly. It is said that research is underway to make body armor ...... this thing**They made it with cornmeal, otherwise it may be more difficult to be penetrated, someone has long used this principle to make body armor, but it is certainly not cornstarch.

There are many important roles in the application of physics, in the face of fluid calculations and heat transfer, and we will also see such examples in our lives, the principle is the example of non-Newtonian fluids. In the face of non-Newtonian fluids, many scientists have made judgments about his properties, and his performance is indeed outstanding.

It refers to a relatively viscous state, and it is not solid, and at the same time it is not liquid, it is between solid and liquid, and then it also has a certain fluidity, and it is soft to the touch.

It is a fluid, and this fluid does not satisfy Newton's law of viscosity, the viscosity will change, and when the liquid is subjected to stronger pressure, it will become harder, and when the pressure is small, it will be like a liquid.

Non-Newtonian fluids are divided into generalized Newtonian fluids, time-sensitive non-Newtonian fluids, and viscoelastic fluids.

Non-Newtonian fluid: refers to a fluid that does not satisfy Newton's experimental law of viscosity, that is, the fluid whose shear stress is not linear with the shear strain rate. Non-Newtonian fluids are widely found in life, production, and nature.

The vast majority of biofluids are now defined as non-Newtonian fluids. A variety of bodily fluids such as blood, lymph, and sac fluid, as well as "semi-fluids" such as cytoplasm, are non-Newtonian fluids.

Tomato juice, starch liquid, egg white, apple pulp, concentrated sugar water, soy sauce, jam, condensed milk, agar, potato pulp, molten chocolate, dough, rice flour ball, and various myme-like food materials such as surimi and minced meat are also non-Newtonian fluids.

Basic characteristics of jet expansion:

If a non-Newtonian fluid is forced to flow from a large container into a capillary, and then out of the capillary, the diameter of the jet is larger than that of the capillary. The ratio of the diameter of the jet to the diameter of the capillary luciment is called the mold expansion rate (or extrudate expansion ratio). For Newtonian fluids, it relies on the Reynolds number, the value of which is about between.

In the case of polymer melts or coded concentrated solutions, the values are much larger, even more than 10.

In general, the mold expansion rate is a function of the flow rate and the length of the capillary. The phenomenon of mold swelling is very important in the design of the die. When the polymer melt flows out of the nozzle of a rectangular section, the expansion on the long side of the pipe section is more pronounced than the expansion on the short side.

Especially on the long side of the pipe section**, the swelling is maximum. Therefore, if the cross-section of the product is required to be rectangular, the shape of the die must not be rectangular, but must be concave in the middle of the four sides.

Non-Newtonian fluid: refers to a fluid that does not satisfy Newton's experimental law of viscosity, that is, the fluid whose shear stress is not linear with the shear strain rate. Non-Newtonian fluids are widely found in life, production, and nature. The vast majority of biofluids are non-Newtonian fluids by definition.

A variety of bodily fluids such as lymphatic fluid and sac fluid on the human body, as well as "semi-fluids" that roll like cytoplasm, are non-Newtonian fluids.

Properties: For non-Newtonian fluids, the frictional force acting on the liquid element is related to the past state of motion of the liquid in addition to the current state of motion, that is, the liquid has a memory effect.

One of the more well-known and easy-to-make non-Newtonian fluids is corn starch with water, which is about 5 parts corn flour mixed with 3 parts water.

In a beaker with a viscoelastic fluid (a type of non-Newtonian fluid with large lead), rotate the experimental rod.

For Newtonian fluids, the liquid level will be concave due to centrifugal force; In the case of viscoelastic fluids, however, they flow towards the center of the cup and climb up the rod, turning the liquid surface convex, a phenomenon that can be observed even when the rotation speed of the rod is very low.

When designing a mixer, the effects of the climbing rod effect must be taken into account. Similarly, this effect should be considered and exploited when designing transport pumps for non-Newtonian fluids.

Non-Newtonian fluids refer to fluids that do not satisfy Newton's experimental laws of viscosity, that is, there is no linear relationship between their shear stress and the shear rate of blind swimming. Non-Newtonian fluids are widely found in life, production, and nature. The vast majority of biofluids are now defined as non-Newtonian fluids.

Non-Newtonian fluid examples: A variety of bodily fluids such as blood, lymph, and sac fluids in the human body, as well as "semi-fluids" like cytoplasm are all non-Newtonian fluids.

In fluid mechanics, a Newtonian fluid is a fluid with a constant flow viscosity that does not vary with the shear rate. In contrast, a non-Newtonian fluid is a fluid whose flow viscosity varies with the shear rate and does not remain constant. Therefore, the characteristics of non-Newtonian fluids are fundamentally different from those of Newtonian fluids, and different fluid mechanics theories need to be used to describe and analyze.

Non-Newtonian fluids have a very different flow state than Newtonian fluids when rubbed on rigid hard surfaces or when used in lubricating oil coatings due to the shear effect they occur in the flow state. Therefore, when measuring the properties of damage, eddy currents, adaptation, etc., the flow properties of non-Newtonian fluids cannot be explained by the theory of Newtonian fluids, but a more complex theory of non-Newtonian fluids is required.

The flow properties of non-Newtonian fluids are complex and influenced by a variety of factors. For example, the viscosity of non-Newtonian fluids varies with the shear rate of the plum, which has the property of shear instability. In addition, the flow properties of non-Newtonian fluids can be affected by a variety of factors such as temperature, pressure, pH, etc.

Therefore, the term "non-Newtonian fluids" is used to describe this particular class of fluids, whose non-Newtonian properties are significantly different from those of Newtonian fluids, and need to be described and explained by different theories of fluid mechanics.

Non-Newtonian fluids are widely found in production and daily life, such as toothpaste, emulsion, liquid alloys, asphalt, cosmetics, acid rare earths, honey, and many more. These complex fluids are found in many different fields, including medicine, chemical engineering, architecture, geology, food science, and more. The study of non-Newtonian fluids is important for understanding many phenomena and processes in these fields.

To describe the properties of non-Newtonian fluids, scientists have come up with a variety of different physical models and mathematical methods. The most common are the force equilibrium equation and the constant process. The force equilibrium equation attempts to describe the properties of substances such as solids, liquids, and gases by describing the strength of the viscosity balance.

A constant process describes a stable flow state and determines the non-Newtonian properties of the fluid based on the equilibrium of forces.

In practical applications, it is important to measure the viscosity and rheological properties of non-Newtonian fluids. Measurement methods include viscometer, shear meter, rotation tester, etc., and different measurement methods are suitable for different non-Newtonian fluid samples. Measurement and analysis provide a better understanding of the properties of non-Newtonian fluids, which provides an important reference for further development of the research field and the optimization of related products.