The density and specific heat of a plastic material are known (p = 950 kg/m 3 ,
Question:
The density and specific heat of a plastic material are known (p = 950 kg/m3, cp = 1100 J/kg ∙ K), but its thermal conductivity is unknown. To determine the thermal conductivity, an experiment is performed in which a thick sample of the material is heated to a uniform temperature of 100°C and then cooled by passing air a 25°C over one surface. A thermocouple embedded a distance of X m = 10 mm below the surface records the thermal response of the plastic during cooling.
If the convection coefficient associated with the air flow is h = 200 W/m2 ∙ K and a temperature of 60°C is recorded 5 min after the onset of cooling, what is the thermal conductivity of the material?
Step by Step Answer:
Fundamentals of Heat and Mass Transfer
ISBN: 978-0471457282
6th Edition
Authors: Incropera, Dewitt, Bergman, Lavine