The authors present an ultrafast electron beam x-ray computed tomography technique usable for imaging of fast processes, such as multiphase flows or moving parts in technical or biological objects. The setup consists of an electron beam unit with fast deflection capability and an ultrafast multielement x-ray detector and achieves 10000frames∕s image rate. Since full sampling of the Radon space requires an angular overlap of source path and detector which strongly decreases axial resolution, the authors devised a limited-angle-type tomography. As a demonstration they visualized the movement of particles and gas bubbles rising in a stagnant liquid.
This work focuses on the investigation of the effective thermal conductivity (λ eff ) of heterogeneous materials consisting of a phase change material (PCM) and expanded graphite (EG). These composites may be employed in latent heat storage systems, where a PCM stores energy by being heated to a temperature higher than its melting point (T m ), and releases it during solidification. For the determination of λ eff , the steady-state comparative method was used and modified to measure composite samples at temperatures above T m . Results were compared with the thermal conductivity of the pure PCMs, and a significant increase could be observed. The dependence of λ eff on temperature, as well as the influence of the material microstructure on the enhancement of λ eff , were examined.
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