DETAILED AGENDA

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.

Presentation:
This presentation has not yet been uploaded.

Handouts:
No handouts have been uploaded.

Peter Hsieh (POC,Primary Presenter,Author), National Energy Technology Laboratory, peter.hsieh@netl.doe.gov;
Michael Johnson (Co-Author), National Energy Technology Laboratory, michael.johnson@netl.doe.gov;
Rigel Woodside (Co-Author), National Energy Technology Laboratory, rigel.woodside@netl.doe.gov;
Richard Chinn (Co-Author), National Energy Technology Laboratory, Richard.Chinn@netl.doe.gov;






Contact Us