Engineering, 08.02.2021 18:40 haileybug0305
Measuring thermal conductivity of a wide range of materials accurately is a difficult task. One example of an instrument to measure thermal conductivity is the hot disk analyzer, which is simply a flat, circular hot wire heater that is calibrated to measure surface temperature and surface heat flux. Consider the version of the hot disk analyze, where a cylinder of material is placed onto the disk of the same diameter, and the sides are well insulated. The temperature of the top of the cylinder is measured optically to avoid thermal contact resistance errors, and so the top must be open to the air. The primary challenge of any thermal conductivity measurement is to minimize error due to unintentional heat loss. You wish to measure the thermal conductivity of pure silver (k = 429 W/m-K) to calibrate the machine and estimate its error. The cylinder and disk both have a diameter D = 0.01, and the cylinder has a height of L = 0.02. You apply 5.2 W to the heater and measure a temperature difference between the top and bottom surface of the cylinder of 2.7 C. What is the measured thermal conductivity of the cylinder?
Answers: 2
Engineering, 03.07.2019 15:10
Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.
Answers: 1
Engineering, 04.07.2019 18:10
What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.
Answers: 2
Engineering, 04.07.2019 18:10
Atmospheric air has a temperature (dry bulb) of 80° f and a wet bulb temperature of 60° f when the barometric pressure is 14.696 psia. determine the specific humidity, grains/lb dry air. a. 11.4 c. 55.8 d. 22.5 b. 44.1
Answers: 1
Engineering, 04.07.2019 18:10
Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.
Answers: 2
Measuring thermal conductivity of a wide range of materials accurately is a difficult task. One exam...
English, 09.12.2020 21:30
Advanced Placement (AP), 09.12.2020 21:30
Mathematics, 09.12.2020 21:30
Mathematics, 09.12.2020 21:30
Social Studies, 09.12.2020 21:30
Mathematics, 09.12.2020 21:30
Mathematics, 09.12.2020 21:30
Biology, 09.12.2020 21:30