To examine the temperature profile and to determine thermal conductor from radial conduction through the wall of cylinder.

1. Experiment # 3
Objective:
To examine the temperature profile and to determine thermal conductor from radial conduction
through the wall of cylinder.
Apparatus:
Fig3.1 (Heat conduction unit)
Procedure:
 Make sure that the main switch is initially off. Then insert a brass conductor (13mm
diameter) section intermediate section into the linear module and clamp together.
 Turn on the water supply ensure the water flowing through the free end of the water pipe
to drain pipe to drain. This should be checked at intervals.
 Turn the heater power control knob control panel to the fully anticlockwise position and
connect the sensors leads.
 Switch on the power supply and main switch, the digital readouts will be illuminated.
 Connect the six sensor leads (T1,2,3,4,5,6,) to the plugs on the top of the linear
conduction module. Connect the left hand sensor lead from the module to the place
marked T1 on the control panel. Repeat this procedure for the remaining five sensor lead
connecting them from left to right on the module and in numeral order on the control
panel.
 Turn the heater power control to 20 Watts and allow sufficient time for a steady state
condition to be achieved before recording the temperature at all nine sensor points and
the input power reading on the wattmeter (Q). Repeat the procedure for input power
between 10 watts. After each change, sufficient time must be allowed to achieve steady
state conditions.
 Plot the temperature, T (℃) versus distance, x (meter) calculate the actual thermal
conductivity and theoretical.

2. Observation:
Sr#
Heater
power
Q (W)
𝑻 𝟏
(℃)
𝑻 𝟐
(℃)
𝑻 𝟑
(℃)
𝑻 𝟒
(℃)
𝑻 𝟓
(℃)
𝑻 𝟔
(℃)
K
(W/m℃)
1 5 35.9 33 32.7 32.1 32 31.6 15.055
2 7 40.9 39.7 38.5 37.5 36.0 35.0 5.901
3 10 43.0 41.5 40.5 39.5 38.1 37.4 8.782
4 12 46.2 44.8 43.0 40.0 38 37.5 5.0584
Graph:
Result:
Varying the input power will affect the heat transfer coefficient. When the input power, Q(watt)
increases, the overall heat transfer coefficient, U (W/𝑚2
k) will decrease. There will be difference
between U calculated from the experiment and K calculated theoretically because of the
difference in variables (input power, area, temperature, distance and thermal conductivity) used.