EML3015C Thermal-Fluid I         Fall 1999

Lab. Assignment #2

Stefan-Boltzmann Radiation

Heat Transfer subjects reviewed: Thermal radiation, Stefan-Boltzmann law, radiation emission

Description: Stefan-Boltzmann lamp is nothing more than an incandescent lamp with a Tungsten filament as described in our lab. assignment 1, see the following picture.

lamp.jpg (47856 bytes)

The lamp can be used to provide high temperature radiation source for the investigation of Stefan-Boltzmann Law.

wpe3.jpg (1846 bytes)

If the surface temperature Ts is much higher than the surrounding temperature Tsurr, the radiation heat flux is proportional to the surface temperature to the fourth power.

wpe4.jpg (1097 bytes)

In this experiment, we would like to investigate the validity of this relation by measuring the radiation heat from the the heated tungsten filament at various temperatures.   The experimental setup is shown in the following figure.

setup.jpg (241133 bytes)

Use the following procedures:

pwer sup.jpg (56428 bytes)Power Supply

wpe5A.jpg (7722 bytes)

sensor meter1.jpg (54048 bytes)

Sensor facing the room: low voltage reading

sensor meter2.jpg (53722 bytes)

Sensor facing a hand: higher voltage reading due to thermal rdiation emitted from hand

 

wpe5B.jpg (1456 bytes)