| Student Manual |  In the present experiment, the students will heat a metallic rod in a temperature-regulated furnace or on a hot plate and place it inside a cavity approximating a black body cavity. The temperature on the surface of the heated object as well as inside the cavity will be monitored with time. The rate of cooling will be determined and the impact of forced convection currents will also be investigated. The students will learn how to interface temperature sensors with the computer. In the course of the measurements, the students will also verify Newton’s law of cooling as a special case. |
| Software Code | Heat Transfer |
| Sample Results | Forced and natural convectionForced and natural convection, linearized plots |
| Experiment Code | 1.3 |
| Version | 17 January 2015, 2015-v1 |
Further Readings and References
- Do darker objects really cool faster?American Journal of Physics, R.A. Bartels, 58, 244, (1990).
- Introducing specific heat through cooling curvesThe Physics Teacher, C.R. Mattos, A. Gasper, 40, 415, (2002).
- Heating water: rate correction due to Newton’s coolingThe Physics Teacher, J. O. Connell, 37, 551, (1999).
Pictorial Procedure
1. Provided apparatus
2. Cavity with cooling fan cable
3. Measuring the mass of a cylinder
4. Measuring the diameter of a cylinder
5. Cylinder inside the steel box
6. Attaching thermocouple to the cylinder
8. Always use gloves and tong to remove the heated cylinder from steel box
9. Placing a heated cylinder inside the cavity
10. Attaching E2 thermocouple to the clamp
11. Attaching a labeled E1 thermocouple inside the cavity and E2 with the cylinder
12. Preparing Labview file for forced convection
13. Experimenatl setup for demonstarating forced concvection alongwith thermocouple calibration
14. Closing the base of the cavity
15. Labview file for radiative and convective losses
16. Setup for simultaneous radiative and convective losses