Does the viscosity of oil cause changes in oil pressure?
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How does the viscosity of oil cause changes in the oil pressure in an oil pump? What is the principle behind this?
Yes, the viscosity of oil is related to temperature; the lower the temperature, the higher the viscosity. The molecular distance decreases, resulting in low compressibility.
With constant flow rate, the greater the viscosity of the oil, the greater the friction in the pipeline, and the higher the pressure generated at the pump outlet.
The pressure required for lubrication is generated by pipeline pressure loss and the bearing oil film clearance. As viscosity increases, pipeline pressure loss rises and the oil film pressure increases, which in turn leads to an increase in the required lubricating oil pressure.
The viscosity of the oil does not directly affect the oil pressure, especially the static pressure generated by the oil, as pressure is independent of viscosity. However, when the oil pump is pumping, the viscosity of the oil has a very significant impact on the transfer process; that is, both the dynamic viscosity and the kinematic viscosity of the oil directly affect the pressure resistance during pumping. Increasing the oil temperature appropriately can reduce the resistance during pumping; additionally, using pipes with a larger diameter also lowers the pumping resistance. The resistance to pumping is manifested as the pressure drop or pressure difference along the pumping path.
It will change, because the viscosity of the lubricating oil varies with temperature