RADIAL HEAT CONDUCTION EXPERIMENT Objectives To show heat

RADIAL HEAT CONDUCTION EXPERIMENT

Objectives To show heat conducts around a solid disc of uniform dimension and material. 2. To show you can calculate the experiment thermal conductivity of the material in a solid disc of uniform dimension. 1.

Introduction Comparison between linear and radial heat transfer

Radial Heat Conduction � The equation of radial heat conduction is similar to that for linear heat transfer, except that it calculates the area and thickness of the ring-shaped pieces of material between the temperature measurements points. This of course needs their inner and outer radii and the thickness of the disc.

� At equally spaced radii on the disc, seven thermocouples measure the temperature as the heat conducts radially outwards from the heater. � Insulation around the disc reduces heat loss by convection and radiation, so that the results should match theory for simple radial conduction only.

Equipment's � Base unit: TD 1002 Heat Transfer Experiments Base Unit

� TD 1002 b Radial Heat Conduction Experiment

Procedure � brass material Connect and setup the radial heat conduction experiment (TD 1002 A). Ø Create a blank results table. Ø Material: Ambient: power (W) T 1(C) T 2(C) T 3(C) T 4(C) T 5(C) T 6(C) T 7(C) 30 50 0. 01 0. 02 0. 03 0. 04 0. 05 0. 06 Radial from 0 T 1(m)

Ø Ø Ø Use accurate thermometer to check the local ambient air temperature for reference. Open the water outlet valve to start the water flowing, then switch on the heater and set to 30 watts power. Wait for the temperature to stabilize and then record T 1 to T 7 . For the comparison, repeat the test at one or more heater powers greater than 30 W. Switch off the heater and the water supply.

Results � The relationship between the Temperature and Distance at power 30 watt 45 40 Temperature (°C) 35 30 25 20 15 10 5 0 0 0. 01 0. 02 0. 03 0. 04 Radial from T 1 (m) 0. 05 0. 06 0. 07

� The relationship between the Temperature and Distance at power 50 watt 60 Temperature (°C) 50 40 30 20 10 0 0 0. 01 0. 02 0. 03 0. 04 Radial from T 1 (m) 0. 05 0. 06 0. 07

Calculation thermal conductivity at power 30 �