A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

(h₁.h₂.h₃)1/3

1/h₁ + 1/h₂ + 1/h₃

None of these

h₁ + h₂ + h₃

(h₁.h₂.h₃)1/3

1/h₁ + 1/h₂ + 1/h₃

None of these

h₁ + h₂ + h₃

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Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Equal to Nusselt number

Equal to one

Greater than one

Less than one

Equal to Nusselt number

Equal to one

Greater than one

Less than one

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Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

Prandtl number

Stanton number

Grashoff number

Biot number

Prandtl number

Stanton number

Grashoff number

Biot number

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Heat and Mass Transfer
Fourier's law of heat conduction is (where Q = Amount of heat flow through the body in unit time, A = Surface area of heat flow, taken at right angles to the direction of heat flow, dT = Temperature difference on the two faces of the body, dx = Thickness of the body, through which the heat flows, taken along the direction of heat flow, and k = Thermal conductivity of the body)

k. (dx/dT)

k. A. (dT/dx)

k. (dT/dx)

k. A. (dx/dT)

k. (dx/dT)

k. A. (dT/dx)

k. (dT/dx)

k. A. (dx/dT)

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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

RN = μ cp/k

RN = ρ V l /μ

RN = hl/k

RN = V²/t.cp

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Heat and Mass Transfer
The expression Q = ρ AT4 is called

Newton Reichmann equation

Joseph-Stefan equation

Fourier equation

Stefan-Boltzmann equation

Newton Reichmann equation

Joseph-Stefan equation

Fourier equation

Stefan-Boltzmann equation

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Heat and Mass Transfer

Heat and Mass Transfer A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Heat and Mass Transfer The ratio of surface convection resistance to the internal conduction resistance is known as

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)

Heat and Mass Transfer The expression Q = ρ AT4 is called

Heat and Mass Transfer
A cube at high temperature is immersed in a constant temperature bath. It loses heat from its top, bottom and side surfaces with heat transfer coefficients of h₁, h₂ and h₃ respectively. The average heat transfer coefficient for the cube is

Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Heat and Mass Transfer
The ratio of surface convection resistance to the internal conduction resistance is known as

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)

Heat and Mass Transfer
The expression Q = ρ AT4 is called