안녕하세요.이 포스트는 네이버 블로그에서 작성된 게시글입니다.자세한 내용을 보려면 링크를 클릭해주세요.감사합니다. Low viscosity at higher operating temperatures leads to turbulent flow, which increases the heat transfer. A low VI expresses a considerable change of viscosity with change of temperature.
Lube oils for automotive internal combustion engines must have a high viscosity index. Lube oils were then compared to these benchmarks.
An attention to the temperature-viscosity characteristics of lubricants is therefore of practical importance for ensuring the lubricants desirable performance in any particular system. Oils with low temperature-dependent viscosity change (HVI-oils, refined from Pennsylvania crudes, paraffinic oil) were on the high end of the scale. 0000001186 00000 n Despite of the development in temperature-viscosity characteristics in empirical terms, some of which are useful for engineering calculations; nevertheless, they often appear to be less useful as a quick guidance for practitioners. The equation appears to be as simple as: Competence in Tribological Modeling, Simulation and Analysis, MFT Platform can perform multiple standard tests combined wiht inline imaging, Unique desktop force measurement system for friction, wear, fatigue testing. Using these parameters and the measured viscosity of the oils at 40 °C and 100 °C, the viscosity index can be calculated.
The content of viscosity modifiers is approximately 5 % to 20 %. 네이버는 블로그를 통해 저작물이 무단으로 공유되는 것을 막기 위해, 국제단위계(Systeme International,불어)에서는 센티포이즈 와 센티스토크로 표기한다. The viscosity readings of a measurement from 40 °C to 100 °C can differ from those of a descending measurement from 100 °C to 40 °C. A low viscosity index ensures efficient cooling performance of a transformer oil. 유체란 외력에 항구적으로 저항하지 않는 물체로 정의되며 압축성 유체인 기체와 비압축성 유체인 액체로 구분할 수 있다.
Such oils are highly viscous at low temperatures and rather thin at high temperatures. 이러한 것들을 조사하기 전에 필요한 양을 도입해 놓는다. They typically have a VI around 90.
A low viscosity index ensures efficient cooling performance of a transformer oil. startxref This information is used to improve the website.
These polymer additives are commonly being used for viscosity index improvement in multi-grade oils. A higher viscosity implies a slower flow and a thicker fluid.
These are the current methods for calculating the VI for petroleum products used in civil and military applications.
SAE 40 is for use in warm surroundings: it is the “summer” oil. Mathematically, viscosity index represents a relative measure of a lubricants temperature-viscosity behavior with respect to two reference oils. 0000241357 00000 n From these measured values, the kinematic viscosity at 40 °C and 100 °C can be determined according to ASTM D34112. However, it is also known that temperature impacts the viscosity.
동점도 : 일반적으로 윤활유에서 점도라 하면 동점도를 말하며, cSt 단위로 된 것을 가장 일반적으로 사용합니다. Group별 점도지수 값을 보시면, Group I에서 Group IV로 갈수록 점도지수는 높게 됩니다, #점도 #동점도 #kinematicviscosity #점도지수 #ViscosityIndex #GroupII #GroupIII #GroupIII+. %PDF-1.4 %���� The VI of common oil types ranges from -60 to over 400. 물을 용기에 따를 때는 줄줄 잘 흘러내리지만 물엿이나 꿀은 끈적거려서 잘 흘러내리지 않는다. In the early VI systems, the temperatures for viscosity measurement were 100 °F and 210 °F, corresponding to 37.78 °C and 98.89 °C. The calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced by our calculators.
Calculate the viscosity using the viscosity index The calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced by our calculators. Oil viscosity index explained. Oil viscosity often declines rapidly with respect to rise in temperature. Furthermore, the viscosity change over temperature is not linear. 네이버 여행 서비스를 이용해 주신 여러분께 감사드리며, 더 좋은 서비스로 보답할 수 있도록 노력하겠습니다. Thus, the viscosity index measures the ability of an engine oil to resist becoming thinner at high temperatures. It allows for a better comparison of the viscosity behavior of different oils based on temperature. Manage your online orders and purchase settings, Get full access to download all documents, Pharmaceutical instrument qualification service, Viscosity Index of Base and Lube Oils with SVM™ 4001, VI from kinematic viscosity at 40 °C and 100 °C, VI from kinematic viscosity at two free temperatures, Why engine oil viscosity is so important in Formula 1, www.machinerylubrication.com/Read/28956/lubricant-viscosity-index, delibra.bg.polsl.pl/Content/16169/P-102_1943_No232.pdf, www.stle.org/images/pdf/STLE_ORG/BOK/OM_OA/Additives/Special%20Additive%20Report_Viscosity%20Index%20Improvers_tlt%20article_Sept11.pdf, publishing.energyinst.org/topics/fuel-quality-and-control/ip-test-methods/ip-71-section-1-petroleum-products-transparent-and-opaque-liquids-determination-of-kinematic-viscosity-and-calculation-of-dynamic-viscosity2, ISO - International Organization for Standardization ‘. Temperature is the most influential parameter for the viscosity change of oil.
One of the most important groups comprises viscosity index improvers4 (= VII)/viscosity modifiers.
The VI is a dimensionless number, i.e.
- 점도지수가 120 이상인 Group III 기유를 VHVI (Very High Viscosity Index)기유.
The viscosity index is an arbitrary number indicating the effect of change of temperature on the kinematic viscosity of an oil.
Nowadays, engine oils provide a VI in the range of approximately 140 to 200.
Lube oils for automotive internal combustion engines must have a high viscosity index. Lube oils were then compared to these benchmarks.
An attention to the temperature-viscosity characteristics of lubricants is therefore of practical importance for ensuring the lubricants desirable performance in any particular system. Oils with low temperature-dependent viscosity change (HVI-oils, refined from Pennsylvania crudes, paraffinic oil) were on the high end of the scale. 0000001186 00000 n Despite of the development in temperature-viscosity characteristics in empirical terms, some of which are useful for engineering calculations; nevertheless, they often appear to be less useful as a quick guidance for practitioners. The equation appears to be as simple as: Competence in Tribological Modeling, Simulation and Analysis, MFT Platform can perform multiple standard tests combined wiht inline imaging, Unique desktop force measurement system for friction, wear, fatigue testing. Using these parameters and the measured viscosity of the oils at 40 °C and 100 °C, the viscosity index can be calculated.
The content of viscosity modifiers is approximately 5 % to 20 %. 네이버는 블로그를 통해 저작물이 무단으로 공유되는 것을 막기 위해, 국제단위계(Systeme International,불어)에서는 센티포이즈 와 센티스토크로 표기한다. The viscosity readings of a measurement from 40 °C to 100 °C can differ from those of a descending measurement from 100 °C to 40 °C. A low viscosity index ensures efficient cooling performance of a transformer oil. 유체란 외력에 항구적으로 저항하지 않는 물체로 정의되며 압축성 유체인 기체와 비압축성 유체인 액체로 구분할 수 있다.
Such oils are highly viscous at low temperatures and rather thin at high temperatures. 이러한 것들을 조사하기 전에 필요한 양을 도입해 놓는다. They typically have a VI around 90.
A low viscosity index ensures efficient cooling performance of a transformer oil. startxref This information is used to improve the website.
These polymer additives are commonly being used for viscosity index improvement in multi-grade oils. A higher viscosity implies a slower flow and a thicker fluid.
These are the current methods for calculating the VI for petroleum products used in civil and military applications.
SAE 40 is for use in warm surroundings: it is the “summer” oil. Mathematically, viscosity index represents a relative measure of a lubricants temperature-viscosity behavior with respect to two reference oils. 0000241357 00000 n From these measured values, the kinematic viscosity at 40 °C and 100 °C can be determined according to ASTM D34112. However, it is also known that temperature impacts the viscosity.
동점도 : 일반적으로 윤활유에서 점도라 하면 동점도를 말하며, cSt 단위로 된 것을 가장 일반적으로 사용합니다. Group별 점도지수 값을 보시면, Group I에서 Group IV로 갈수록 점도지수는 높게 됩니다, #점도 #동점도 #kinematicviscosity #점도지수 #ViscosityIndex #GroupII #GroupIII #GroupIII+. %PDF-1.4 %���� The VI of common oil types ranges from -60 to over 400. 물을 용기에 따를 때는 줄줄 잘 흘러내리지만 물엿이나 꿀은 끈적거려서 잘 흘러내리지 않는다. In the early VI systems, the temperatures for viscosity measurement were 100 °F and 210 °F, corresponding to 37.78 °C and 98.89 °C. The calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced by our calculators.
Calculate the viscosity using the viscosity index The calculator on this site is for informative purposes only and we make no claims as to the accuracy, completeness or fitness for any particular purpose of the results produced by our calculators. Oil viscosity index explained. Oil viscosity often declines rapidly with respect to rise in temperature. Furthermore, the viscosity change over temperature is not linear. 네이버 여행 서비스를 이용해 주신 여러분께 감사드리며, 더 좋은 서비스로 보답할 수 있도록 노력하겠습니다. Thus, the viscosity index measures the ability of an engine oil to resist becoming thinner at high temperatures. It allows for a better comparison of the viscosity behavior of different oils based on temperature. Manage your online orders and purchase settings, Get full access to download all documents, Pharmaceutical instrument qualification service, Viscosity Index of Base and Lube Oils with SVM™ 4001, VI from kinematic viscosity at 40 °C and 100 °C, VI from kinematic viscosity at two free temperatures, Why engine oil viscosity is so important in Formula 1, www.machinerylubrication.com/Read/28956/lubricant-viscosity-index, delibra.bg.polsl.pl/Content/16169/P-102_1943_No232.pdf, www.stle.org/images/pdf/STLE_ORG/BOK/OM_OA/Additives/Special%20Additive%20Report_Viscosity%20Index%20Improvers_tlt%20article_Sept11.pdf, publishing.energyinst.org/topics/fuel-quality-and-control/ip-test-methods/ip-71-section-1-petroleum-products-transparent-and-opaque-liquids-determination-of-kinematic-viscosity-and-calculation-of-dynamic-viscosity2, ISO - International Organization for Standardization ‘. Temperature is the most influential parameter for the viscosity change of oil.
One of the most important groups comprises viscosity index improvers4 (= VII)/viscosity modifiers.
The VI is a dimensionless number, i.e.
- 점도지수가 120 이상인 Group III 기유를 VHVI (Very High Viscosity Index)기유.
The viscosity index is an arbitrary number indicating the effect of change of temperature on the kinematic viscosity of an oil.
Nowadays, engine oils provide a VI in the range of approximately 140 to 200.