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Heat Transfer 3

  1. What are the units for thermal conductivity (k)?
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  2. What are the units for film coefficient (h)?
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  3. What are the units for heat transfer coefficient (U)?
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  4. What are the units for thermal resistance (Rth)?
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  5. What is the equation for heat transfer through a flat plate?
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  6. What is the equation for total heat transfer coefficient?
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  7. What limitations are there on Newton's Method for solving transient heat conduction?

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    • You need a starter value of Tt so you can calculate a starting value of r or t. 
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  8. What do you need to know to use the Lumped Parameter method for solving transient heat conduction?
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    • The Biot number must be less than 0.10.
    • To calculate the Biot and Fourier numbers, the characteristic length (Lc) of a cylindrical object is half its radius.
  9. What is the Stefan- Boltzmann constant, and how is it used to calculate emissive power?
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  10. What do you need to know to use the Lumped Parameter electrical analogy for solving transient heat conduction?
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    The time constant 

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    is the time it takes for the temperature to be reduced to 36.8% of its original value.
  11. What is the equation to compute gray body radiation?
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    • where 
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Author
RJVan
ID
308267
Card Set
Heat Transfer 3
Description
Mechanical Professional Engineering Exam Review
Updated

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