Physics - Fluid Question with Solution | TestHub

A lubricant between a piston and cylinder according to below figure has a kinematic viscosity of $3\times 10^{-5}{\mathrm{m}}^2/\mathrm{s}$ and a relative density of 0.9. If the piston has a mean velocity of 6 m/s what approximate power loss (in kW) will develop due to friction. The piston has a diameter of 150 mm and length 300 mm . The cylinder has a diameter of 150.2 mm. (Dynamic viscosity $\eta =$ kinematic viscosity × density of liquid)