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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 9
36.
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.
Grashoff
Reynolds
both 'a' & 'b'
Prandtl & Grashoff
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The thermal boundary layer at NPr > 1
is thicker than hydrodynamic boundary layer.
is thinner than hydrodynamic boundary layer.
and the hydrodynamic boundary layer are identical.
disappears.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
In the free convection regime of pool boiling, the heat flux is proportional to
Δt1/2
Δt2
Δt5/4
Δt
Answer: Option
Explanation:
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39.
With increase in temperature, the thermal conductivity of fresh lubricating oil
increases
decreases
remains unchanged
may increase or decrease; depends on its composition
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
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
0.5
0.6
0.7
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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