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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

Option (B) and (C) above
W/m °K
J/m² sec
J/m °K sec

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Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = μ cp/k
RN = ρ V l /μ
RN = hl/k
RN = V²/t.cp

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Heat and Mass Transfer
In heat exchangers, degree of approach is defined as the difference between temperatures of

Hot medium outlet and cold water inlet
Cold water inlet and outlet
Hot medium outlet and cold water outlet
Hot medium inlet and outlet

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Heat and Mass Transfer
An ordinary passenger aircraft requires a cooling system of capacity.

4 TR
10 TR
2 TR
8 TR

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Heat and Mass Transfer
According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

T5
T
Absolute temperature
T2

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Heat and Mass Transfer
Sensible heat factor is given by (where S.H. = Sensible heat, and L.H. = Latent heat)

(L.H - S.H)/S.H
S.H/(S.H + L.H)
(S.H + L.H) /S.H
S.H/(L.H - S.H)

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