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
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 = V²/t.cp

RN = μ cp/k

RN = hl/k

RN = ρ V l /μ

RN = V²/t.cp

RN = μ cp/k

RN = hl/k

RN = ρ V l /μ

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Heat and Mass Transfer
Heat transfer in liquid and gases takes place by

Conduction and convection

Radiation

Convection

Conduction

Conduction and convection

Radiation

Convection

Conduction

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Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?

All of these

In convection, stirring of the fluid and cleaning the heating surface.

In radiation, increasing the temperature and reducing the emissivity.

In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

All of these

In convection, stirring of the fluid and cleaning the heating surface.

In radiation, increasing the temperature and reducing the emissivity.

In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.01

0.002

0.02

0.1

0.01

0.002

0.02

0.1

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Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

-1

1

=-1/3

=-2/3

-1

1

=-1/3

=-2/3

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as

Radiation

Forced convection

Free convection

Conduction

Radiation

Forced convection

Free convection

Conduction

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Heat and Mass Transfer

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 Heat transfer in liquid and gases takes place by

Heat and Mass Transfer Which of the following would lead to a reduction in thermal resistance?

Heat and Mass Transfer Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

Heat and Mass Transfer The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, 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
Heat transfer in liquid and gases takes place by

Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?

Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as