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About the introduction of viscometer measurement method Viscometer viscosity measurement has three measurement methods: dynamic viscosity, kinematic viscosity and conditional viscosity
.
(1) Dynamic viscosity: ηt is the resistance produced when the two liquid layers are 1 cm apart and their area is 1 (square centimeter) and the relative moving speed is 1 cm/sec, the unit is g/cm·sec
.
1 g/cm·sec = 1 poise General: The industrial unit of dynamic viscosity is expressed in poise
.
(2) Kinematic viscosity: At the temperature t°C, the kinematic viscosity is represented by the symbol γ.
In the unit system, the kinematic viscosity unit is st, that is, square meter per second (m2/s).
In actual measurement, centistokes, (cst ) indicates that the unit of centistoke is square millimeter per second (ie 1cst=1mm2/s)
.
Kinematic viscosity is widely used to measure the viscosity of jet fuel oil, diesel oil, lubricating oil and other liquid petroleum products, dark petroleum products, lubricating oil after use, crude oil, etc.
The viscosity expressed in conditional units measured by a specific viscometer, there are the following three types of conditional viscosity commonly used in various countries: ① Engler viscosity, also known as Engler viscosity
.
It is a certain amount of sample, at a specified temperature (such as: 50 ° C, 80 ° C, 100 ° C), the time required to flow out 200 ml of sample from Enzler viscosity and the time required for distilled water to flow out the same volume at 20 ° C ( seconds) ratio
.
When the temperature is tº, the Enj viscosity is represented by the symbol Et, and the unit of Enj viscosity is the condition degree.
② The Sagbolt viscosity is the Sagbolt viscosity
.
It is the number of seconds required for a certain amount of sample to flow out of 200 ml from Saybolt viscosity at a specified temperature (such as 100ºF, F210ºF or 122ºF, etc.
), in "seconds"
.
Saybolt viscosity is further divided into Saybolt general viscosity and Saybolt heavy oil viscosity (or Saybolt Furol viscosity)
.
③ Reinhardt viscosity is Redwood viscosity
.
It is the number of seconds required for a certain amount of sample to flow out of 50 ml from the degree of Rays at a specified temperature, in "seconds"
.
Reinhardt viscosity is divided into Reinhardt No.
1 (represented by Rt) and Reinhardt No.
2 (represented by RAt)
.
The above three conditions of viscosity measurement methods are commonly used in Europe and the United States.
In China, the other two types of viscometers are rarely used except for the measurement of dark lubricating oil and residual oil by Ennst viscometer
.
The three conditional viscosity representation methods and units are different, but the relationship between them can be converted through the chart
.
At the same time, Enz viscosity and kinematic viscosity can also be converted, which is much more convenient and flexible
.
.
(1) Dynamic viscosity: ηt is the resistance produced when the two liquid layers are 1 cm apart and their area is 1 (square centimeter) and the relative moving speed is 1 cm/sec, the unit is g/cm·sec
.
1 g/cm·sec = 1 poise General: The industrial unit of dynamic viscosity is expressed in poise
.
(2) Kinematic viscosity: At the temperature t°C, the kinematic viscosity is represented by the symbol γ.
In the unit system, the kinematic viscosity unit is st, that is, square meter per second (m2/s).
In actual measurement, centistokes, (cst ) indicates that the unit of centistoke is square millimeter per second (ie 1cst=1mm2/s)
.
Kinematic viscosity is widely used to measure the viscosity of jet fuel oil, diesel oil, lubricating oil and other liquid petroleum products, dark petroleum products, lubricating oil after use, crude oil, etc.
The viscosity expressed in conditional units measured by a specific viscometer, there are the following three types of conditional viscosity commonly used in various countries: ① Engler viscosity, also known as Engler viscosity
.
It is a certain amount of sample, at a specified temperature (such as: 50 ° C, 80 ° C, 100 ° C), the time required to flow out 200 ml of sample from Enzler viscosity and the time required for distilled water to flow out the same volume at 20 ° C ( seconds) ratio
.
When the temperature is tº, the Enj viscosity is represented by the symbol Et, and the unit of Enj viscosity is the condition degree.
② The Sagbolt viscosity is the Sagbolt viscosity
.
It is the number of seconds required for a certain amount of sample to flow out of 200 ml from Saybolt viscosity at a specified temperature (such as 100ºF, F210ºF or 122ºF, etc.
), in "seconds"
.
Saybolt viscosity is further divided into Saybolt general viscosity and Saybolt heavy oil viscosity (or Saybolt Furol viscosity)
.
③ Reinhardt viscosity is Redwood viscosity
.
It is the number of seconds required for a certain amount of sample to flow out of 50 ml from the degree of Rays at a specified temperature, in "seconds"
.
Reinhardt viscosity is divided into Reinhardt No.
1 (represented by Rt) and Reinhardt No.
2 (represented by RAt)
.
The above three conditions of viscosity measurement methods are commonly used in Europe and the United States.
In China, the other two types of viscometers are rarely used except for the measurement of dark lubricating oil and residual oil by Ennst viscometer
.
The three conditional viscosity representation methods and units are different, but the relationship between them can be converted through the chart
.
At the same time, Enz viscosity and kinematic viscosity can also be converted, which is much more convenient and flexible
.
