Thermal conduction : EXP300050
Référence : EXP 300 050
This comprehensive pack is designed to implement the fundamental law linking heat flow to temperature gradient and to the surface crossed by the heat flow. One end of a metal bar is heated electrically. Temperate air circulation allows temperature at the second end to be kept at a markedly constant value. A series of eight temperature sensors is distributed along the metal bar to be studied. Thanks to an acquisition system and its software, the temperature of each sensor is recovered as a function of time, as well as heat flow in Watt. All data acquired over time can be used.
CONDUCTIVITY IN STEADY-STATE CONDITIONS
Place the bar to be studied in the box. Close the box with the set screws so as to approach optimum adiabatic conditions. Then start heating and cooling. The temperatures of the 8 sensors and the heat flow will be displayed. After roughly fifteen minutes, the steady state is achieved: temperature is constant as a function of time at all points of the space. The straight line representing the temperature gradient is displayed, i.e. temperature as a function of the position of each sensor. Via the leading coefficient or the ordinate at the origin of this line, you can find the material conductivity value using Fourier’s law.
STUDYING THE TRANSIENT STATE
Place the bar to be studied in the box and start an acquisition. In this state, temperature has not yet attained
balance point temperature. The software displays the temperature of each sensor as a function of time. With knowledge of material density, the material diffusivity value can be found with the heat distribution equation.
COMPARING DIFFERENT MATERIALS
We supply a copper bar and an aluminium bar (a steel bar is available as an option) to compare the conductivities of the
different materials. The bars can be interchanged with no problem. The 3 materials can be studied during a hands-on exercise of 2 hours most. We can also work on the return to the original state following heating or on continuous heating without cooling.
SUBJECTS APPROACHED
»»Heat transfer
»»Thermal conduction
»»Thermal resistance
»»Fourier’s law
»»Material properties
|
|
Mon compte
