Engine oil at 100°C flows over and parallel to a flat surface at a velocity of 3 m/s. Calculate the thickness of the hydrodynamic boundary layer at a distance 0.3 m from the leading edge of the surface.
GIVEN
Engine oil flows over a flat surface
Engine oil temperature (Tb) = 100°C
Engine oil velocity (U) = 3 m/s
FIND
The hydrodynamic boundary layer thickness (?) at a distance 0.3 m from the leading edge
ASSUMPTIONS
Steady state
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 17, for engine oil at 100°C
Kinematic viscosity (v) = 20.3 ? 10–6 m2/s
The local Reynolds 0.3 m from the leading edge based on the bulk fluid temperature is
Since
the boundary layer is laminar. The boundary layer thickness for laminar flow over a flat plate is given by Equation (5.28)
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