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Heat Transfer

Heat Transfer
Reynold's analogy states that

Nst α f
NRe α f
Nst α NRe
NNu α f

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Heat Transfer
Multipass heat exchangers are used

To obtain higher heat transfer co-efficient and shorter tube
Because of simplicity of fabrication
For low heat load
To reduce the pressure drop

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Heat Transfer
_______ paint has the maximum absorption coefficient.

Grey
Yellow
White
Black

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Heat Transfer
Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for

Cube
Cylinder
Equal for all the three
Sphere

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Heat Transfer
For a counter current heat exchanger with Tih = 80°C, T°c = 60°C, T°h = 50°C and Tic = 30°C, and the temperature difference between the two streams being the same everywhere along Z, the direction of flow of hot fluid. The temperature profile should satisfy

d²T/dZ² > 0
dT/dZ = 0
d²T/dZ² = 0
d²T/dZ² < 0

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Heat Transfer
Choose the correct equation.

Nu = (Re) (Pr) (St)
Nu = (Pr)(St)
Nu = (Re) (Pr) (Gz)
Nu = (Re)(Pr)

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