How to calculate the kinematic viscosity index 10 by using the kinematic viscosity of lubricating oi

Viscous temperature properties of the body.

The viscosity temperature characteristic is expressed by the viscosity index, which is the relative comparison value of the viscosity temperature characteristics of the oil.

Viscosity index The viscosity of lubricating oil decreases with the increase of temperature and increases with the decrease of temperature, which is the viscosity temperature characteristic of lubricating oil. Therefore, the report on viscosity must indicate the temperature at the time of the determination.

The viscosity index (VI) is generally used to evaluate the viscosity and temperature characteristics of oils, which is also an important quality index of lubricating oils.

Viscosity index (VI) = (L-U) (L-H) 100

l- The kinematic viscosity of petroleum products with the viscosity index is the same at 100, while the kinematic viscosity of petroleum products with zero viscosity index is 40, mm2 s;

u-The kinematic viscosity of the petroleum product at 100 for which the viscosity index is calculated, mm2 s;

h- The kinematic viscosity of petroleum products with the viscosity index is the same at 100, while the kinematic viscosity of petroleum products with viscosity index of 100 is at 40, mm2 s;

If you want to calculate the viscosity index of lubricating oil, you must first know the viscosity index of the base oil, which is blended with several base oils.

Viscosity of 100 degrees, viscosity of 40 degrees of 68, ask what the viscosity index is.

How is the viscosity index of lubricating oil calculatedHello dear, the algorithm of viscosity index (viscosity index) A: If the viscosity index is between 0 and 100, this method is used. It is calculated as follows:

Viscosity index vi=[(l-u) (l-h)]*100h A known oil with a viscosity index of 100 has a viscosity of 100 (or 40), but its viscosity at 210 should be the same as that of an unknown oil at 210 (or 100). Because of its very high viscosity index, it is based on the H (high) alphabet. l Known oils with a viscosity index of 0 at a viscosity of 100 (or 40).

However, its viscosity at 210 (or 100) should be the same as that of an unknown oil at 210 (or 100). Because of its very low viscosity index, it is based on the L (Low) alphabet. u Unknown viscosity index of raw materials, viscosity at 100 (or 40).

Algorithm B of Viscosity Index (VISCOSITY INDEX): It is specially used to calculate the viscosity index of more than 100 celery spring oilseeds. If the result of the old method of calculating a certain oil exceeds 100, it must be recalculated using this method and the result of the calculation of method b must be reported.

and is expressed as vi(e), vi(extended), vie, or epitaxial viscosity index. It is calculated as follows: vi(e) antilog n) 1 where n increases the viscosity of the oil sample at 210 to equal the exponent required for the ratio of h and u at 100 hours.

That is, the dynamic viscosity of N (H-U) (KV210), or KV210N H UKV210 oil sample at 210 (or 100) (KV is the abbreviation of kinemetic viscosity) H is obtained by method A to obtain a known oil with a viscosity index of 100, and its dynamic viscosity at 100 (or 40) (can be found from Table 24 of the first space) U The dynamic viscosity of the oil sample at 100 (or 40) (at this time, H u) is used, for example: search for an oil sample at 100 and 210 The dynamic viscosity of each is and. Try to find its viscosity index.

Punching refers to the impact failure between the piston of the internal combustion engine of the vehicle and the cylinder barrel of the steamer. The main reason for the phenomenon of cylinder flushing in vehicles is that there is a serious shortage of lubricating oil, which leads to a sharp increase in the friction temperature between the cylinder barrel and the piston, as well as between the connecting rods. At high temperatures, the coefficient of thermal expansion of the metal object changes dramatically, resulting in a rapidly reduced lubrication gap and a locking condition between the piston and the cylinder barrel and connecting rod.

The cylinder block will be severely damaged by impact due to the strong inertia of operation.

What are the phenomena of the cylinder head gasket rushing:

1. White smoke will come out of the exhaust pipe when the car is hot, because after the cylinder gasket is flushed, the coolant will leak into the cylinder for combustion. Due to the high temperature environment in the cylinder, the coolant will evaporate into a mist, which will emerge in the exhaust pipe;

2. The pressure of the heat dissipation tank is high, accompanied by a large number of bubbles. After the cylinder gasket is washed and damaged, a large amount of air will enter the heat dissipation system, and when the air cannot be discharged, it will lead to high water temperature, and in serious cases, the water tank will burst;

3. There are a lot of foam and oil stains in the antifreeze. The oil will enter the cooling system from the cylinder head gasket, and if you look at the coolant water tank, you can see that it is relatively turbid, and there are bubbles, etc.;

4. There is water leakage and oil leakage near the cylinder gasket, which can directly reflect the phenomenon of the cylinder gasket being flushed.

After the cylinder head gasket is flushed, it is not recommended that the owner continue to drive, if it is close to the 4S shop, the owner can drive slowly to the 4S shop for processing. If it is far away from the 4S store, it is best to call ** for help. The water in the water jacket may enter the cylinder liner, and the gas of the cylinder liner may enter the water jacket, and continuing to drive may cause engine loss.

The kinematic viscosity index value of the grease is one of the main parameters in the viscosity of the engine oil, which is the data behind the w, and the data is selected in the label This data development shows that each label has a corresponding kinematic viscosity index value, and the following is a variety of grease kinematic viscosity tables that match the labels:

Oil model specification (W after the label) 100 viscosity value (CST) with the expansion of the label value, the matching kinematic viscosity also expands, and the larger the kinematic viscosity indicates that the higher the maintenance performance of the oil, the higher the natural environment can be used, the stronger the airtightness of the oil, but the weaker the circulation.

This does not mean that the higher the kinematic viscosity, the better, the application of excessive viscosity of the oil, the oil slick will be thinner, not enough moisturizing, the parts will be aggravated damage, noise amplification and other conditions. The use of oil with too small kinematic viscosity will reduce the safety protection performance, increase the friction resistance of the engine, and the corresponding fuel consumption will also increase. We need to choose the appropriate kinematic viscosity to maintain the engine faster, so that the engine can give full play to the performance of more macro and fast.

For example, German cars are highly recommended to use high-viscosity oil, while Japanese cars and Korean cars are conversely low-viscosity oil, which is also due to the structure of the engine.

Similarly, for new cars and high-rise cars, because the cylinder tightness is good, lower viscosity oil can be used, and for low-grade cars and old cars, higher viscosity oil needs to be selected, due to the engine rubber processing technology and long-term cylinder damage, high viscosity oil can produce thicker slick oil, stronger maintenance of the engine. When choosing engine oil, it is necessary to select the right engine oil according to the overall consideration of many factors such as the driver's natural environment, the specific situation of the car and the car maintenance manual.

Millions of car purchase subsidies.

Summary. Hello, the kinematic viscosity of grade 150 lubricating oil at 50 is the kinematic viscosity of grade 90150 lubricating oil at 50.

Hello, grade 150 lubricant has a kinematic viscosity of 9050 degrees at 50 degrees, and a kinematic viscosity: 50

100 degree kinematic viscosity:

Density: Then calculated according to the formula:

LGLG (V1+ (Equation 1)

LGLG (V2+ (Formula 2)

V1 is the viscosity at 50, V2 is the viscosity at 100, T is the absolute temperature substituted to calculate the constant B, M, and the formula is obtained: LGLG (V+ The viscosity of the product at any time is calculated according to this formula.

Therefore, at 150, the kinematic viscosity is.

Here's a formula for you.

lglg(v+

where v is the kinematic viscosity at temperature t, mm2 st is the absolute temperature, k

b, m is the constant of each oil.

Typical oils will tell you the kinematic viscosity of 40 and 100, and you can bring in the finding constants b,m

Bring in the formula. You can get down to the exponential relationship between temperature and viscosity, and you can calculate the viscosity at any temperature.

2.The temperature range under each grade of oil is specified in the national standard, GB T 14906-94

The basic characteristic of flow is to think of a liquid flowing as many layers moving parallel to each other, and the velocity of each layer is different, forming a velocity gradient (dv dx).

Due to the presence of velocity gradients, the slower-flowing liquid layer blocks the flow of the faster liquid layer, thus. The liquid creates resistance to movement. In order for the liquid layer to maintain a certain velocity gradient motion, a reverse force must be applied to the liquid layer in contrast to the resistance.

This force exerted on a unit layer area is known as shear stress (n m2).

Shear rate (d) d=d v d x (s-1).

Shear stress and shear rate are the two basic parameters that characterize the rheological properties of a system.

Newton defined the viscosity of a fluid in the pattern of Figure 4-1. Two fluids of different planes but parallel, with the same area "a", separated by a distance "dx", and flowing in the same direction at different velocities "v1" and "v2", Newton assumed that the force to keep these different velocities proportional to the relative velocity or velocity gradient of the fluid, i.e.,

dv dx = d (Newton's formula) where is related to the properties of the material, which we call "viscosity".

Viscosity definition: two plates with an area of 1m2 are immersed in a liquid, the distance between the two plates is 1 meter, if a shear stress of 1n is added, so that the relative rate between the two plates is 1 ms, then the viscosity of the liquid is.

Newtonian fluids: Fluids that conform to Newton's formula. Viscosity is only related to temperature, not to shear rate, and is directly proportional to d.

Non-Newtonian fluid: does not conform to Newton's formula d=f(d), and a represents the viscosity under a certain (d), which is called apparent viscosity.

There are three methods for viscosity determination: dynamic viscosity, kinematic viscosity and conditional viscosity.

1) Dynamic viscosity: t is the resistance generated when the two liquid layers are 1 cm apart from each other, and their areas are 1 (square centimeters) and their relative moving speed is 1 cm second, and the unit is Crimmi.

Viscosity is fixed.

Righteousness: Combine two faces.

If the shear stress of DU1N is added to make the relative DAO rate between the two plates 1ms, the viscosity of the liquid is .

Kinematic viscosity: At the temperature t, the kinematic viscosity is expressed by symbols, in the International System of Units, the unit of kinematic viscosity is s, that is, square meters per second (m2 s), and in actual measurement, centis, (cst) is expressed in millimeters per second square (i.e., 1cst=1mm2 s). Kinematic viscosity is widely used to determine the viscosity of liquid petroleum products such as jet fuel oil, diesel oil, lubricating oil, dark petroleum products, lubricating oil after use, etc., the determination of kinematic viscosity adopts countercurrent method The viscosity of grease under a certain temperature condition is a variable that changes with the shear rate, and this viscosity is called similar viscosity, and the unit is.

The similar viscosity in the grease decreases as the shear rate increases, but as the shear rate continues to increase, the similar viscosity of the grease approaches the viscosity of its base oil.