TEN (313310) Practical No:11 Conduct a trial on the conduction setup of metallic rod and calculate thermal conductivity
It helps students to understand the conduction principles of heat transfer. Understanding thermal conductivity is crucial for various real-world applications, such as designing efficient heat exchangers, thermal insulations, and cooling systems in industries like automotive, aerospace, and HVAC. Understanding thermal conductivity is crucial for designing efficient heat exchangers, thermal insulation systems, and other engineering applications where heat transfer plays a significant role. Students become familiar with experimental techniques and instruments used in measuring thermal conductivity, such as calorimeters, thermocouples, and temperature sensors.
Procedure
1. Give necessary electrical and water connections to the instrument.
2. Start the electric supply.
3. Give input to the heater by slowly rotating the dimmer stat and adjusting it to a voltage equal
to 80 V, 120 V, etc.
4. Start the cooling water supply through the water jacket and adjust it from about 300 cc to 500
cc per minute.
5. Rod temperature will start rising. Go on checking the temperatures at time intervals of 5
minutes.
6. Wait till a steady state is reached.
7. Note the temperature at different points on the metallic rod with the help of
thermocouples mounted on it ( T1 to T8) when a steady state is reached.
8. Measure inlet & outlet temperature of water ( T9& T10 )
9. Repeat the experiment for different heater inputs.
10. After the experiment is over, switch off the electrical connections, allow the water to
flow for some time in the water jacket, and then stop it.
Observation Table
Calculations –
Practical-related questions
1. Explain the phenomenon of heat transfer by conduction.
Answer:
2. Define thermal conductivity, and state its unit.
Answer:
3. Interpret the effect of temperature on the thermal conductivity of materials.
Answer:
4. Explain the mathematical equation that represents Fourier's Law of heat conduction and how it relates to temperature gradients and heat flux.
Answer:
5. Interpret the effect of the thickness of a material on the rate of heat transfer by conduction.
Answer:
6. List the common methods used to measure temperature gradients along the length of the metallic rod during the experiment.
Answer:
Conclusion
We successfully completed TEN (313310) Practical No:11 Conduct a trial on the conduction setup of metallic rod and calculate thermal conductivity.