Researchers discovered that heat can move like a fluid in purified graphite under specific conditions, leading to more efficient heat removal in electronic devices. The phenomenon, called 'phonon Poiseuille flow,' was observed with more than double the heat conductivity of natural graphite and has p
Researchers at the Institute of Industrial Science, The University of Tokyo use isotopically purified graphite to study the phenomenon of heat flowing like a fluid, which can lead to new heat-sink devices for electronics. Credit: Institute of Industrial Science, The University of Tokyo
Before the modern understanding of thermodynamics, scientists sometimes thought of heat as a fluid called “caloric.” However, we now know that heat is actually the random kinetic energy possessed by the vibrating atoms or molecules that make up a material. Sometimes, the vibrations can be thought of physical particles called phonons, which are the main contributors of heat conduction in.
“Our study clarified the theoretical criteria for the formation of phonon Poiseuille flow in graphite, a material that shows strong anisotropy, which had not been clear before,” lead author Dr. Xin Huang says. Graphite, also known as pencil lead, is very inexpensive and easy to produce. As a result, it is already being used for heat dissipation in some electronic devices that produce a lot of waste energy during operation. Using purified graphite that had at most 0.
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