Cognitive Performance in Military Senior Leaders: Analysis & Implications
No abstract available
Williams, T. J.↗
Engineering topics
Ecker, A.
Publications and source records attributed to Ecker, A..
Fluid flow in solidifying monotectic alloys
Use of a two-wavelength holographic technique results in a simultaneous determination of temperature and composition profiles during directional solidification in a system with a miscibility gap. The relationships among fluid flow, phase separation, and mass transport during the solidification of the monotectic alloy are discussed. The primary sources of fluid motion in this system are buoyancy and thermocapillary forces. These forces act together when phase separation results in the formation of droplets (this occurs at the solid-liquid interface and in the bulk melt). In the absence of phase separation, buoyancy results from density gradients related to temperature and compositional gradients in the single-phase bulk melt. The effects of buoyancy are especially evident in association with water- or ethanol-rich volumes created at the solid-liquid growth interface.
Ecker, A.↗
Two-wavelength holographic measurement of temperature and concentration during alloy solidification
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Ecker, A.↗
Simultaneous temperature and concentration measurement in front of solidifying monotectic systems using the two wavelength holographic technique
A holographic technique for the simultaneous measurement of temperature and concentration in solidifying transparent model alloy systems was developed. Its application to the study of the interactions between the temperature, concentration, and fluid flow fields in such systems at 1 g and micro-g conditions is discussed.
Ecker, A.↗
A two wavelength holographic technique for simultaneous measurement of temperature and concentration during the solidification of two component systems
Simultaneous measurement of the temperature and concentration distribution within a fluid can be made using a 'two wavelength holographic' setup. The technique is successfully applied to the study of temperature, concentration, and flow fields in the melt of a transparent 'model alloy' during solidification.
Ecker, A.↗