Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
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Category > Management Posted 10 Dec 2017 My Price 9.00

insulating powder.

A method for determining the thermal conductivity k and the specific heat cp of a material is illustrated in the sketch. Initially the two identical samples of diameter D = 60 mm and thickness L = 10 mm and the thin heater are at a uniform temperature of Ti = 23.00°C, while surrounded by an insulating powder. Suddenly the heater is energized to provide a uniform heat flux on each of the sample interfaces, and the heat flux is maintained constant for a period of time, ∆to. A short time after sudden heating is initiated, the temperature at this interface To is related to the heat flux as

 

For a particular test run, the electrical heater dissipates 15.0 W for a period of ∆t0 = 120 s, and the temperature at the interface is To(30 s) = 24.57°C after 30 s of heating. A long time after the heater is deenergized, t ≫ t0, the samples reach the uniform temperature of To(∞) =33.50°C. The density of the sample materials, determined by measurement of volume and mass, is ρ = 3965 kg/m3.

Determine the specific heat and thermal conductivity of the test material. By looking at values of the thermophysical properties in Table A.1 or A.2, identify the test sample material.

 

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Maurice Tutor
(5)
Status NEW Posted 10 Dec 2017 09:12 PM My Price 9.00

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