1. Engineering
  2. Mechanical Engineering
  3. 217 an apparatus for measuring thermal conductivity employs an electrical...

Question: 217 an apparatus for measuring thermal conductivity employs an electrical...

Question details

2.17 An apparatus for measuring thermal conductivity employs an electrical heater sandwiched between two identical samples of diameter 30mm and length 60mm, which are pressed between plates maintained at a uniform temperature T-77℃ by a circulating fluid. A conduct- ing grease is placed between all the surfaces to ensure good thermal contact. Differential thermocouples are imbedded in the samples with a spacing of 15 mm. The lateral sides of the samples are insulated to ensure one- dimensional heat transfer through the samples. Plate, To Sample Heater eadsInsulation Sample--+-. AT Plate, T
(a) With two samples of SS316 in the apparatus, the heater draws 0.353 A at 100V, and the differential thermocouples indicate ΔΤ, ΔΤ2_: 25.0°C. What is the thermal conductivity of the stainless steel sam- ple material? What is the average temperature of the samples? Compare your result with the thermal con- ductivity value reported for this material in Table A.1
Solution by an expert tutor
Blurred Solution
This question has been solved
Subscribe to see this solution