Heat Transfer Internal Flow Film Temperature

In summary, the conversation discusses the calculation of film temperature for evaluating the flow properties of a fluid passing through a tube. The film temperature is defined as the average of the surface temperature and the free-stream temperature. It is also mentioned that the free-stream temperature, which varies along the tube, is not explicitly stated in the problem and the necessary physical properties of the alloy are needed to solve the problem.
  • #1
eurekameh
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I have three temperatures (temperature of the fluid going in, temperature going out, and the temperature of the surface of the tube). What I'm trying to figure out is the film temperature at which I should evaluate the flow properties. The film temperature is defined as T,f = (T,s + T,infinity)/2, where T,s is the surface temperature, and T,infinity is the free-stream temperature. Am I to assume that the free-stream temperature is the same as the surface temperature, since it's not in the problem statement?
 
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  • #2
The free stream temperature is Tinfinity. It varies from the inlet to the exit of the tube. What physical properties of the alloy do you need to know to solve this problem?
 

1. What is heat transfer in internal flow?

Heat transfer in internal flow refers to the transfer of thermal energy between two flowing fluids, or between a fluid and a solid surface, within a closed system. This can occur through conduction, convection, and radiation.

2. What is the importance of film temperature in heat transfer?

Film temperature is an important concept in heat transfer as it represents the average temperature of the fluid or solid surface in contact with the fluid. It is used in calculations to determine the heat transfer coefficient and the rate of heat transfer.

3. How is film temperature calculated?

Film temperature is calculated by taking the average of the fluid and surface temperatures, weighted by their respective thermal resistances. It is given by the equation: tf = (th + tc) / 2, where tf is film temperature, th is hot temperature, and tc is cold temperature.

4. What factors affect film temperature in internal flow?

The factors that affect film temperature in internal flow include the temperature and thermal properties of the fluid and solid surface, the flow rate, the geometry of the system, and the presence of external heat sources or sinks.

5. How does film temperature affect heat transfer in internal flow?

Film temperature has a direct effect on heat transfer in internal flow as it determines the temperature difference between the fluid and solid surface. A higher film temperature results in a larger temperature difference, leading to a higher rate of heat transfer. It also affects the heat transfer coefficient, which is used to calculate the rate of heat transfer.

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