2.4 Explain how an extended surface increases heat transfer. 2.4.1 Provide an eq
ID: 1860102 • Letter: 2
Question
2.4 Explain how an extended surface increases heat transfer.
2.4.1 Provide an equation and brief explanation for the four boundary condition cases this chapter addresses:
1.
2.
3.
4.
2.4.1 What is the meaning of q?
2.6 What variable do we now need to consider in transient conduction?
2.6.1
a) Explain the physical meaning of the Biot Number.
2.6.2 With respect to heat transfer, what is unique about an infinite slab?
2.6.3 With respect to heat transfer, what is unique about a semi-infinite solid?
2.7 When can we use the charts for transient heat conduction?
Explanation / Answer
2.4 Extended Surface provides Increased surface area for convection heat transfer , thus it increases heat transfer.. this structures are generally called as FINS
2.4.1 Can u provide me the chapter and book details so that I can look up and answer
2.4.1 q is the heat flux through a surface q = Q/A
2.6 Along with space coordinates we also need to consider time as variable in transient conduction
2.6.1 Biot Number is the the heat transfer resistances inside of and at the surface of a body. The physical significance of Biot number is that it provides a measure of resistance offered to heat floe within the body and outside the body. If the thermal resistance of the fluid/sphere interface exceeds that thermal resistance offered by the interior of the metal sphere, the Biot number will be less than one.
2.6.2 Infinite Slab is the case where heat transfer is only 2-Dimensional in nature
2.6.3 A semi-infinite solid is an idealized body that has a single plane surface and extends to infinity in all directions. This idealized body is used to indicate that the temperature change in the part of the body in which we are interested (the region close to the surface) is due to the thermal conditions on a single surface.
2.7 Heisler Charts can be used to evaluate the central temperature for transient heat conduction through an infinitely long plane wall of thickness 2L, an infinitely long cylinder of radius ro, and a sphere of radius ro
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