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Heat Transfer

Heat Transfer
In the free convection regime of pool boiling, the heat flux is proportional to

Δt5/4
Δt1/2
Δt
Δt2

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Heat Transfer
If the baffle spacing in a shell and tube heat exchanger increases, then the Reynolds number of the shell side fluid

Remains unchanged
Increases or decreases depending on number of shell passes
Increases
Decreases

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Heat Transfer
Fresh orange juice contains 12% (by weight) solids and the rest water 90% of the fresh juice is sent to an evaporator to remove water and subsequently mixed with the remaining 10% of fresh juice. The resultant product contains 40% solids. The kg of water removed from 1 kg fresh juice is

0.4
0.7
0.5
0.6

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Heat Transfer
Nusselt number is a function of Prandtl number and __________ number of fluid in natural convection heat transfer.

Biot
Stantan
Grashoff
Reynolds

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Heat Transfer
Reynold's analogy states that

Nst α NRe
Nst α f
NRe α f
NNu α f

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Heat Transfer
What is the emissivity of a black body?

0.9
0.5
1

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