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Title: Computational/analytical study of the transient hot wire-based thermal conductivity measurements near phase transition

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1415310
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
International Journal of Heat and Mass Transfer
Additional Journal Information:
Journal Volume: 111; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-01-02 04:45:27; Journal ID: ISSN 0017-9310
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Nabil, Mahdi, and Khodadadi, J. M. Computational/analytical study of the transient hot wire-based thermal conductivity measurements near phase transition. United Kingdom: N. p., 2017. Web. doi:10.1016/j.ijheatmasstransfer.2017.04.043.
Nabil, Mahdi, & Khodadadi, J. M. Computational/analytical study of the transient hot wire-based thermal conductivity measurements near phase transition. United Kingdom. doi:10.1016/j.ijheatmasstransfer.2017.04.043.
Nabil, Mahdi, and Khodadadi, J. M. 2017. "Computational/analytical study of the transient hot wire-based thermal conductivity measurements near phase transition". United Kingdom. doi:10.1016/j.ijheatmasstransfer.2017.04.043.
@article{osti_1415310,
title = {Computational/analytical study of the transient hot wire-based thermal conductivity measurements near phase transition},
author = {Nabil, Mahdi and Khodadadi, J. M.},
abstractNote = {},
doi = {10.1016/j.ijheatmasstransfer.2017.04.043},
journal = {International Journal of Heat and Mass Transfer},
number = C,
volume = 111,
place = {United Kingdom},
year = 2017,
month = 8
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on April 21, 2018
Publisher's Accepted Manuscript

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  • In this study, measurements of the thermal conductivity of solid materials with large thermal conductivities such as metals were carried out by a transient hot-wire method of comparison previously reported by the authors in which half of a specimen was compared with a reference material. A thin ribbon hot wire was employed to reduce and stabilize the thermal resistance between the hot wire and the specimen. Three methods were developed for electrical insulation between the hot wire and the specimen. Consequently, it was found that the materials with high conductivity to about 100 W/(mK) can be roughly measured by themore » hotwire method.« less
  • Thermal-conductivity measurements are reported for the new refrigerants R134a, R152a und R123. Transient hot-wire experiments were performed which cover both the liquid and vapor states at temperatures and pressures ranging from [theta] = [minus]20[degrees]C to 90[degrees]C and from p = O.1 bar to 60 bar respectively. The results are correlated with density and temperature. In addition temperature dependent correlations are presented for (1) saturated liquid, (2) saturated vapor, (3) ideal gas (which equals approximately vapor state at ambient pressure). Finally the results are compared with data from the literature and also with the thermal conductivities of R12 and R11. 35more » refs., 14 figs., 8 tab.« less
  • New absolute measurements of the thermal conductivity of liquid n-hexane, n-heptane, and n-decane are reported. The measurements have been carried out in the temperature range 300-370 K at atmospheric pressure in a transient hot-wire instrument. The accuracy of the measurements is estimated to be +/- 0.5%. The density dependence of the thermal conductivity of n-hexane and n-heptane is found to be well described by a universal equation for the hydrocarbons based on a rough hard-sphere model. The measurements of the three hydrocarbons studied are also employed to generate more accurate effective core volumes, which are the only parameters characteristic ofmore » the fluid required for the application of the proposed universal scheme.« less