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CFX heat transfer coefficient vs theoretical value

CFX heat transfer coefficient vs theoretical value

(OP)
I have calculated a heat transfer coefficient for a flow over flat plate according to Incropera's heat transfer book.
In addition I created a model in CFX and calculated the heat transfer coefficient (I used expert parameter tbulk set to
air inlet temperature 20C=293K). The values are 7.9 and 4.1, respectively. Does anyone have an idea why the values differ?

The boundary conditions are following:

Inlet 0.8 m/s and 20C
Outlet 0.8 m/s
Other faces are modelled as adiabatic walls.
100W heat source at the bottom of plate.
For air, default properties (turbulence model etc.) are used.

http://imgur.com/a/90z4G

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