Why Hot Water Freezes Faster Than Cold Water and Why the Coldest Water Heats Fastest
Water behaves strangely. Hot water freezes the fastest and the coldest water heats the quickest. This has puzzled philosophers and scientists alike for more than two thousand years.
Researchers have now confirmed how this phenomenon occurs in granular fluids, that is, those composed of particles that are very small and interact among those that lose part of their kinetic energy. They recently published the findings in Physical Review Letters.
Thanks to this theoretical characterization, “we can simulate on a computer and make analytical calculations to know how and when the Mpemba effect will occur,” said Antonio Lasanta. Lasanta is from the UC3M Gregorio Millán Barbany University Institute for Modeling and Simulation on Fluid Dynamics, Nanoscience and Industrial Mathematics.
“In fact,” he said, “we find not only that the hottest can cool faster but also the opposite effect: the coldest can heat faster, which would be called the inverse Mpemba effect.”
Credit: UC3M
Credit: UC3M
“The scenario that the effect will most easily occur in is when the velocities of the particles before heating or cooling have a specific disposition–for example, with a high dispersion around the mean value,” he said. This way, the evolution of the temperature of the fluid can be significantly affected if the state of the particles is prepared before the cooling.
This research of “basic science,” in addition to contributing to improving fundamental knowledge, might have other applications in the mid or long term. In fact, this group of researchers is planning to carry out an experiment that verifies the theory. Learning to emulate and use this effect might have applications in our daily life, according to scientists. For example, it could be used to make electronic devices which we want to cool faster.
Ana Maria Herrera
Citation: When the Hotter Cools More Quickly: Mpemba Effect in Granular Fluids
Antonio Lasanta, Francisco Vega Reyes, Antonio Prados, and Andrés Santos
Phys. Rev. Lett. 119, 148001 – Published 4 October 2017 http://dx.doi.org/10.1103/PhysRevLett.119.148001
Source: http://www.ineffableisland.com/2017/11/why-hot-water-freeze-faster-than-cold.html
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