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Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

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Anomalous heating in a colloidal system.

Avinash Kumar¹, Raphaël Chétrite², John Bechhoefer³

¹Department of Physics, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.

Proceedings of the National Academy of Sciences of the United States of America

|January 26, 2022

Summary

This summary is machine-generated.

Researchers observed the inverse Mpemba effect in a colloidal system, where colder initial temperatures led to faster heating. This anomalous heating phenomenon was studied in Brownian particles within a tilted double-well potential.

Keywords:

Fokker–Planck equation feedback traps forward Mpemba effect inverse Mpemba effect thermal relaxation

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Area of Science:

Thermodynamics
Colloidal science
Statistical physics

Background:

The Mpemba effect describes anomalous heat transfer where hotter water can freeze faster than colder water.
The inverse Mpemba effect, a less common phenomenon, describes situations where colder systems heat up faster than warmer ones.
Understanding anomalous heat transfer is crucial for various physical and chemical processes.

Purpose of the Study:

To experimentally observe and investigate the inverse Mpemba effect in a colloidal system.
To analyze the dependence of heating times on initial temperatures in a Brownian particle system.
To explore the role of entropic effects in anomalous heating phenomena.

Main Methods:

Utilizing a colloidal system with an overdamped Brownian particle.
Simulating particle behavior in a tilted double-well potential.
Measuring heating times for systems prepared at different initial temperatures.

Main Results:

Observed anomalous heating, consistent with the inverse Mpemba effect, in the colloidal system.
Found a nonmonotonic relationship between initial temperature and heating time.
Demonstrated that entropic effects can weaken the inverse Mpemba effect compared to the usual Mpemba effect.
Identified a strong version of anomalous heating where a cold system heats up exponentially faster.

Conclusions:

The inverse Mpemba effect is experimentally observable in colloidal systems.
Entropic effects play a significant role in modulating the inverse Mpemba effect.
The study provides insights into non-equilibrium thermodynamics and anomalous heat transfer mechanisms.