104. What are the viscosity-temperature properties of oils?
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104. What are the viscosity-temperature properties of oils?
The viscosity of oils changes with temperature; as the temperature rises, the viscosity decreases； As the temperature decreases, the viscosity increases; this property that changes with temperature is known as the viscosity-temperature behavior of oils.
Applications of viscosity-temperature properties: For example, asphalt has high viscosity at low temperatures, making transportation difficult; by raising its temperature to an appropriate level, it can be transported using pumps； When the temperature is too high, the viscosity of lubricating oil decreases, which reduces its lubricating capacity; therefore, it is necessary for the lubricating oil to operate at an appropriate temperature, and methods such as bearing box cooling are used to maintain that temperature.