Heat Transfer Coefficient

Introduction to heat transfer coefficient:

Each and Every form of energy has got its own method of transmission from one place to another place. Heat is one of the forms of energy that can be transmitted over large distances in vacuum. The speciality of heat energy is that it can get transmitted by three distinct processes, totally different from one another. They are conduction, convection and radiation. Among these three methods, transmission of heat by radiation is the significant one.

Radiation is the process of heat transmission from a hot body to a cold body without the help of any material medium.

Conduction and convection are the methods of heat transmission which can be carried out in the presence of material medium only.

Explanation to Heat Transfer Coefficient:

The transmission of heat from the hotter to the colder part of a body without the transfer of the particles of the material medium is defined as conduction.

If a cold body is placed in contact with a hot body, the cold body becomes gradually warmer while the hot becomes colder. This indicates that heat has travelled from one body to the other body. This gradual flow of heat is called thermal Conduction. The thermal conduction can be understood as follows. If one end of a metal rod is placed in a flame, the atoms of that end are in the state of vibration due to the gain of heat energy, the amplitude of vibration at the hot end increases. The vibration atoms collide with the adjacent atoms, and share their energy with them. This vibration energy is passed from one layer to the other layer towards the colder end. But the atoms remain at the equilibrium position. The conduction is most common in solids, since the atoms are well bound in their respective positions. The conduction of heat is different in different solids. The ability to conduct heat in solids is called thermal conductivity.

Co-efficient of Thermal Conductivity:

Consider a rectangular slab of area 'A'. Its two face 'E' and 'F' are maintained at temperatures 'theta'2 C and 'theta'1 C, respectively. Let 'Q' be the amount of heat transmitted by conduction between the faces 'E' and 'F' separated by the distance. The amount of heat transmitted between these two faces by thermal conduction is directly proportional to

The area of the cross-section of the slab 'A'.

The temperature difference between the faces

The time of the flow of heat (t).

The distance between the two faces(d).

by: nayaknandan

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