Heat Transfer Qts: Film Temp & Rate of Heat Transfer/Unit Width

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The discussion focuses on calculating the film temperature and the rate of heat transfer per unit width for engine oil flowing over a flat plate. The film temperature is determined to be 40 degrees Celsius, which was confirmed after receiving the density of the engine oil. Participants noted the challenge of calculating the Reynolds number without density information. The thermal conductivity, Prandtl number, and dynamic viscosity of the oil were provided for the calculations. The conversation highlights the importance of accurate data in heat transfer problems.
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Engine oil at 60 oC flows over flat plate whose temperature is at 20 oC with a velocity of 2 m s-1. The length of the plate is 5m. What is the film temperature and the rate of heat transfer per unit width of the entire plate?
Additional information (at the film temperature):
Thermal conductivity of oil: Prandtl number:
Dynamic viscosity:
k1 = 0.144 W m-1 K-1
Pr = 2870
u = 0.21 kg m-1 s-1

Help!
Can't get a Reynolds number without density..
Is film temperature 40 degrees Celsius?
 
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Qts solved..
Was right..lecturer wrong AGAIN..was then provided with engine oil density
 

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