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TECHNICAL BRIEFS

Measurement of Total Hemispherical Emittance and Specific Heat of Aluminum and Inconel 718 by a Calorimetric Technique

[+] Author and Article Information
Giovanni Tanda

Dipartimento Ingegneria della Produzione, Termoenergetica e Modelli Matematici (DIPTEM),  Università degli Studi di Genova, via all’Opera Pia 15a, I-16145 Genova, Italygiovanni.tanda@unige.it

Mario Misale

Dipartimento Ingegneria della Produzione, Termoenergetica e Modelli Matematici (DIPTEM),  Università degli Studi di Genova, via all’Opera Pia 15a, I-16145 Genova, Italymario.misale@unige.it

J. Heat Transfer 128(3), 302-306 (Jun 15, 2005) (5 pages) doi:10.1115/1.2150840 History: Received December 21, 2004; Revised June 15, 2005

An apparatus for the measurement of the total hemispherical emittance and specific heat of metals has been developed. The measurement principle is based on the calorimetric technique: the sample, heated by Joule effect and placed in a vacuum chamber, exchanges radiative heat transfer with the walls of the container, kept at a relatively low temperature. Emittance is deduced from the radiative heat transfer laws at the steady state. When the heating power is switched off, the specific heat of the sample can be recovered from the time history of the sample temperature during the cooling transient. Measurements have been performed on samples of aluminum Anticorodal alloy and Inconel 718 alloy under different surface conditions in the 350635K range.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic drawing of the apparatus and sketch of the sample∕heater assembly (H=0.09m, W=0.05m, t=0.007m)

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Figure 2

Total hemispherical emittance of aluminium Anticorodal 6063 alloy, as received (1), sandblasted (2), and anodized (3)

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Figure 3

Total hemispherical emittance of Inconel 718 alloy, as electrodischarge machined (4), polished (5), and thermally oxidized (6)

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Figure 4

Cooling curves of temperature vs time for the aluminum samples

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Figure 5

Specific heat of aluminum Anticorodal 6063 and Inconel 718 alloy

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