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Research Papers: Nuclear Power

On the Pressure Dependency of Physical Parameters in Case of Heat Transfer Problems of Supercritical Water

[+] Author and Article Information
Gabor Hazi

 MTA KFKI Atomic Energy Research Institute, H1525 Budapest, Hungarygah@sunserv.kfki.hu

Istvan Farkas

 MTA KFKI Atomic Energy Research Institute, H1525 Budapest, Hungaryfarkasi@sunserv.kfki.hu

www.iapws.org.

J. Eng. Gas Turbines Power 131(1), 012904 (Oct 02, 2008) (6 pages) doi:10.1115/1.2983135 History: Received July 19, 2008; Revised July 19, 2008; Published October 02, 2008

Studying heat transfer problems of supercritical water, the pressure dependency of thermophysical parameters (density, specific heat, viscosity, and thermal conductivity) and the work done by pressure are often neglected. Here we show that the variations of some physical parameters as functions of pressure have the same order of magnitude than their variations as functions of temperature in supercritical water. Therefore, pressure dependency of physical parameters should be taken into account in heat transfer calculations of supercritical water. It is also pointed out that the work done by pressure should not be neglected in supercritical water since the pressure work term has the same order of magnitude than the convective term near the pseudocritical temperature.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Density, specific heat at constant pressure, heat conductivity, and dynamic viscosity of water are shown as functions of temperature at three different supercritical pressures

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Figure 2

Sensitivity parameters KαT and Kαp as functions of temperature in the range of 293–353K at a pressure of 1bar

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Figure 3

Sensitivity parameters KαT (dotted) and Kαp (solid) as functions of temperature at a supercritical pressure of 23MPa

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Figure 4

Sensitivity parameters KαT (dotted line) and Kαp (solid line) as functions of temperature at a supercritical of pressure of 28MPa

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Figure 5

Ratio of the sensitivity parameters KαT∕Kαp at 23MPa (solid), 28MPa (dashed), and 33MPa (dotted)

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Figure 6

Ratio of the convective and pressure work terms as a function of temperature at a pressure of 1bar

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Figure 7

Ratio of the convective and pressure work terms as a function of temperature at supercritical pressures of 23MPa (solid line), 28MPa (dashed line), and 33MPa (dotted line)

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