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 = ρ V l /μ

RN = V²/t.cp

RN = hl/k

RN = μ cp/k

RN = ρ V l /μ

RN = V²/t.cp

RN = hl/k

RN = μ cp/k

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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 outlet

Hot medium outlet and cold water inlet

Cold water inlet and outlet

Hot medium inlet and outlet

Hot medium outlet and cold water outlet

Hot medium outlet and cold water inlet

Cold water inlet and outlet

Hot medium inlet and outlet

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Wien's law

Stefan's law

Kirchhoff's law

Planck's law

Wien's law

Stefan's law

Kirchhoff's law

Planck's law

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Heat and Mass Transfer
Free convection flow depends on

Coefficient of viscosity

Density

All of these

Gravitational force

Coefficient of viscosity

Density

All of these

Gravitational force

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Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

All of these

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

Quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

Quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

All of these

Heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

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Heat and Mass Transfer
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

First law of thermodynamics

Newton's law of heating

Newton's law of cooling

Stefan's law

First law of thermodynamics

Newton's law of heating

Newton's law of cooling

Stefan's law

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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 In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Heat and Mass Transfer Free convection flow depends on

Heat and Mass Transfer Thermal conductivity of a material may be defined as the

Heat and Mass Transfer The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

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
In heat exchangers, degree of approach is defined as the difference between temperatures of

Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Heat and Mass Transfer
Free convection flow depends on

Heat and Mass Transfer
Thermal conductivity of a material may be defined as the

Heat and Mass Transfer
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called