ADVANCED MATERIALS & PROCESSES | MAY/JUNE 2023 9 explains. “But a marvelous thing happens with quantum mechanics. You can forget about the complications of the lattice of ions. Instead, they behave as if they are in a vacuum.” The researchers say it’s possible that one day strange metals could be just as ubiquitous in everyday technologies as conventional metals like copper. uc.edu, www.u-hyogo.ac.jp/english, www.riken.jp/en. HEAT TRANSFER: A CLOSER LOOK Researchers from the Jülich Research Centre in Germany are taking a closer look at heat transfer in granular materials, with a particular focus on the role roughness plays in the process. Granular materials contain large numbers of small, discrete particles, which collectively behave like uniform media. Their thermal conductivity is crucial to understanding their overall behavior—but so far, researchers haven’t considered how this value is affected by the surface roughness of their constituent particles. Scientist Bo Persson discovered that when this roughness is considered, thermal conductivity in granular materials is heavily influenced by particle sizes. These findings could help physicists to better describe a wide array of granular materials—from sand and snow, to piles of rice, coffee beans, and fertilizer. Persson and colleagues examined the thermal conductivity of granular materials in a humid atmosphere, where heat flows via air and water are especially relevant. Their discoveries will enable researchers of future studies to simulate the physical properties in granular materials more closely. www.fz-juelich.de/en. The cumulative probability for the heat conductance due to both the evanescent electromagnetic waves and heat conduction in water capillary bridges. Courtesy of The European Physical Journal B, 2023. Expand Your Heat Treating Knowledge with These Upcoming Courses Education asminternational.org/learning/courses/ Heat Treating Furnaces and Equipment June 15–16 ASM Headquarters & Virtual Classroom Vacuum Heat Treating September 7–8 ASM Headquarters & Virtual Classroom Basics of Heat Treating June 12–14 ASM Headquarters & Virtual Classroom HT, Microstructures, and Performance of Carbon and Alloy Steels August 21–22 Virtual Classroom
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