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

In summary, heat transfer is the movement of thermal energy from one object or substance to another through conduction, convection, or radiation. Film temperature refers to the average temperature of a fluid or gas in contact with a heated or cooled surface, and it is calculated by taking the average of the bulk fluid temperature and the surface temperature using the logarithmic mean temperature difference. The rate of heat transfer is the amount of heat transferred per unit of time, and it is affected by film temperature as a higher film temperature leads to a larger temperature difference and thus a greater rate of thermal energy exchange.
  • #1
tcaldwell
7
0
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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  • #2
Qts solved..
Was right..lecturer wrong AGAIN..was then provided with engine oil density
 

What is heat transfer?

Heat transfer is the movement of thermal energy from one object or substance to another, either by conduction, convection, or radiation.

What is film temperature in heat transfer?

Film temperature refers to the average temperature of a fluid or gas that is in contact with a heated or cooled surface. It is an important factor in determining the rate of heat transfer.

How is film temperature calculated?

Film temperature is calculated by taking the average of the bulk fluid temperature and the surface temperature of the heated or cooled object. This is typically done by using the logarithmic mean temperature difference.

What is the rate of heat transfer?

The rate of heat transfer is the amount of heat that is transferred per unit of time. It is measured in units of watts (W) or British thermal units per hour (BTU/h).

How does film temperature affect the rate of heat transfer?

Film temperature has a significant impact on the rate of heat transfer. As the film temperature increases, the rate of heat transfer also increases. This is because a higher film temperature results in a larger temperature difference between the heated or cooled surface and the fluid, leading to a greater rate of thermal energy exchange.

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