HEAT CONDUCTION

INTRODUCTION

•  The term heat conduction is applied to the mechanism of internal energy exchange from one Body to another, or from one part of the body to another part, by the exchange of kinetic energy of motion of the molecules by direct communication or by the drift of free electrons in the case of I heat conduction in metals.

• This energy transfer takes place from the higher energy molecules to the lower energy molecules. Conduction usually takes place within the boundaries of a body, or across the boundary of a body into another body placed in contact with the first without any appreciable displacement of the matter comprising the body.

ONE AND THREE DIMENSIONAL HEAT CONDUCTION EQUATIONS

•     Consider a one dimensional system as shown in Fig 1.

•     In the steady state system, the Temperature doesn't change with time.

•     If the temperature changes with time the system is known as unsteady state system.

•     This is the general case where the temperature is not constant.