Abstract
A method to determine the true specific heat and true thermal conductivity for glass and other semitransparent materials from dynamic temperature data is presented. A unique fabrication technique to obtain high quality dynamic temperature data from glass test plates employing thermocouples fused to the glass is described. The true thermal conductivity and specific heat of float glass has been measured using these techniques, and the results are compared with the scant data available in the literature. Sensitivity of the measured specific heat and thermal conductivity to sources of uncertainty is identified and these are discussed.
Zusammenfassung
Eine Methode zur Bestimmung der wahren spezifischen Wärmekapazität und der Wärmeleitfähigkeit von Glas und anderen semitransparenten Materialien aus dynamischen Temperaturverläufen wird vorgestellt. Es wird eine außergewöhnliche Herstellungstechnik beschrieben, die in das Glas eingeschmolzene Thermoelemente verwendet, um genaue dynamische Temperaturmeßwerte zu erhalten. Die wahre Wärmeleitfähigkeit und die spezifische Wärmekapazität von Floatglas wurde mit dieser Technik gemessen. Die Ergebnisse werden mit den spärlichen verfügbaren Daten aus der Literatur verglichen. Die Empfindlichkeit der gemessenen spezifischen Wärmekapazität und Wärmeleitfähigkeit gegenüber Fehlerquellen wurde erkannt und diskutiert.
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Abbreviations
- c :
-
specific heat
- c 0 :
-
speed of light in a vacuum
- E :
-
internal energy
- F :
-
radiant flux
- f :
-
blackbody fraction
- h :
-
convective heat transfer coefficient or Planck's constant
- I b λ :
-
Planck's function, 2h c 20 /λ 5 [exp (h c 0/k T)−1]
- k :
-
thermal conductivity or Boltzmann's constant
- L :
-
thickness of layer of semitransparent plate
- m :
-
mass
- T :
-
temperature
- t :
-
time
- y :
-
y-direction coordinate
- α :
-
absorptivity
- ε :
-
emissivity
- ν :
-
frequency
- ϱ :
-
reflectivity or density
- a :
-
ambient temperature
- s :
-
refers to plate surface
- w :
-
refers to surroundings
- 1:
-
refers to the interface between a semitransparent solid and surrounding medium
- 2:
-
refers to the interface between a semitransparent solid and surrounding medium
- λ :
-
refers to wavelength
- ν :
-
refers to frequency
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Dedicated to Prof. Dr.-Ing. U. Grigull's 80th birthday
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Mann, D., Field, R.E. & Viskanta, R. Determination of specific heat and true thermal conductivity of glass from dynamic temperature data. Wärme- und Stoffübertragung 27, 225–231 (1992). https://doi.org/10.1007/BF01589920
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DOI: https://doi.org/10.1007/BF01589920