A fluid flows at 5 m/s over a wide, flat plate 15-cm-long. For each of the following list, calculate the Reynolds number at the downstream end of the plate. Indicate weather the flow at that point is laminar, transition, or turbulent. Assume all fluids are at 40°C.
(a) Air
(b) CO2
(c) Water
(d) Engine Oil
GIVEN
A fluid flows over a flat plate
Fluid velocity (U?) = 5 m/s
Length of plate (L) = 15 cm = 0.15 m
Fluid temperature = 40°C
FIND
The Reynolds number at the downstream end of the plate (ReL) for
(a) Air
(b) CO2
(c) Water
(d) Engine Oil
Indicate if the flow is laminar, transitional, or turbulent
ASSUMPTIONS
Steady state
SKETCH
PROPERTIES AND CONSTANTS
The Reynolds number, from Table 5.3, is
The transition from laminar to turbulent flow over a plate occurs at a Reynolds number of about
5 x 105. For air
For CO2
For water
For engine oil
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