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

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SUMMARY

The discussion centers 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 confirmed to be 40 degrees Celsius, derived from the given temperatures of the oil and the plate. The thermal conductivity of the oil is specified as 0.144 W m-1 K-1, with a Prandtl number of 2870 and a dynamic viscosity of 0.21 kg m-1 s-1. The calculation of the Reynolds number was initially hindered by the absence of density data, which was later provided.

PREREQUISITES
  • Understanding of heat transfer principles, specifically convective heat transfer.
  • Familiarity with fluid dynamics concepts, including Reynolds number and Prandtl number.
  • Knowledge of thermal properties of fluids, such as thermal conductivity and dynamic viscosity.
  • Ability to perform calculations involving film temperature and heat transfer rates.
NEXT STEPS
  • Study the derivation and application of the Reynolds number in fluid flow scenarios.
  • Learn about the significance of the Prandtl number in heat transfer analysis.
  • Explore the calculation of heat transfer coefficients for different fluid types.
  • Investigate the impact of varying fluid properties on heat transfer rates in engineering applications.
USEFUL FOR

Mechanical engineers, thermal analysts, and students studying heat transfer and fluid dynamics will benefit from this discussion, particularly those involved in applications related to engine oil and thermal management systems.

tcaldwell
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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?
 
Engineering news on Phys.org
Qts solved..
Was right..lecturer wrong AGAIN..was then provided with engine oil density
 

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