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

1/h₁ + 1/h₂ + 1/h₃

(h₁.h₂.h₃)1/3

h₁ + h₂ + h₃

None of these

1/h₁ + 1/h₂ + 1/h₃

(h₁.h₂.h₃)1/3

h₁ + h₂ + h₃

None of these

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Heat and Mass Transfer
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

Conduction and convection

Convection

Radiation

Conduction

Conduction and convection

Convection

Radiation

Conduction

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Heat and Mass Transfer
The thermal diffusivities for gases are generally

Less than those for liquids

Dependent on the viscosity

More than those for solids

More than those for liquids

Less than those for liquids

Dependent on the viscosity

More than those for solids

More than those for liquids

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Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Grashoff's number

Reynold's number, Grashoff's number

Prandtl number, Grashoff's number

Reynold's number

Grashoff's number

Reynold's number, Grashoff's number

Prandtl number, Grashoff's number

Reynold's number

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Heat and Mass Transfer
Heat flows from one body to other when they have

Different heat contents

Different atomic structure

Different specific heat

Different temperatures

Different heat contents

Different atomic structure

Different specific heat

Different temperatures

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

Conduction and convection

Convection

Conduction

Radiation

Conduction and convection

Convection

Conduction

Radiation

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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 When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

Heat and Mass Transfer The thermal diffusivities for gases are generally

Heat and Mass Transfer In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Heat and Mass Transfer Heat flows from one body to other when they have

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

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
When heat is transferred from hot body to cold body, in a straight line, without affecting the intervening medium, it is referred as heat transfer by

Heat and Mass Transfer
The thermal diffusivities for gases are generally

Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Heat and Mass Transfer
Heat flows from one body to other when they have

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