Measurements of the thermal conductivity of molten lead using a new transient hot wire sensor


Bilek, Jaromir, Atkinson, John and Wakeham, William (2007) Measurements of the thermal conductivity of molten lead using a new transient hot wire sensor. International Journal of Thermophysics, 28, (2), 496-505. (doi:10.1007/s10765-007-0182-2).

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Description/Abstract

The paper reports new measurements of the thermal conductivity of molten
lead at temperatures from 600 to 750 K. The measurements have been carried
out with an updated version of a modified transient hot-wire (THW)
method, where the hot-wire sensor is embedded within an insulating substrate
with a planar geometry. However, unlike previous sensors of the same type,
the updated sensor works with the hot-wire divided into three thermally isolated
parts. The operation of this sensor has been modeled theoretically using
a finite-element (FE) analysis and has subsequently been confirmed by direct
observation. The new sensor is demonstrated to have a higher sensitivity and
a better signal-to-noise ratio than earlier sensors. Molten lead is used as the
test fluid. It has the lowest thermal conductivity of any material we have yet
studied. This allows us to probe the limits of our sensor system for the thermal
conductivity of high-temperature melts. It is estimated that the uncertainty
of the measurements is 3% over the temperature range studied. The
results are used to examine the application of the Wiedemann–Franz (W-F)
relationship.

Item Type: Article
Additional Information: Presented at the Sixteenth Symposium of Thermophysical Properties, Boulder, USA, 30 Jul - 04 Aug 2006
ISSNs: 0195-928X (print)
Related URLs:
Keywords: molten lead, sensor design, thermal conductivity, transient hot-wire
Subjects: T Technology > TN Mining engineering. Metallurgy
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 47754
Date Deposited: 14 Aug 2007
Last Modified: 27 Mar 2014 18:31
Contact Email Address: jka@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/47754

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