Abstract Details

<< Back to Schedule

5/18/2017  |   10:05 AM - 10:30 AM   |  2

Laser flash thermal diffusivity and dilatometry of tungsten and tungsten-copper electrodes for magnetohydrodynamic energy conversion

In a magnetohydrodynamic (MHD) generator, the electrode surface temperature strongly influences the electrical charge-transfer across the boundary-layer and direct power extraction efficiency. The thermal transport and thermomechanical properties of potential MHD electrode materials are important material parameters; however, these properties are influenced by the electrode fabrication process and resultant microstructure. We measured the thermal diffusivity and the thermal expansion coefficient of wrought tungsten and copper-tungsten pseudo-alloys electrodes being tested in an oxy-kerosene MHD generator. Scanning electron microscopy and energy-dispersive x-ray spectroscopy were used to examine the microstructure and composition of the electrodes. Using the laser flash and dilatometry data, we then estimated the steady-state surface temperature of an electrode subjected to an oxy-kerosene flame based on finite-element modeling. The surface temperature estimates compare favorably against electrode surface temperatures measured directly through optical pyrometry.

This presentation has not yet been uploaded.

No handouts have been uploaded.

Peter Hsieh (POC,Primary Presenter,Author), National Energy Technology Laboratory,;
Michael Johnson (Co-Author), National Energy Technology Laboratory,;
Rigel Woodside (Co-Author), National Energy Technology Laboratory,;
Richard Chinn (Co-Author), National Energy Technology Laboratory,;

Contact Us