Related Experiment Video
Updated: May 31, 2025
05:20
Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
17.3K
Heat Transport Hysteresis Generated Through Frequency Switching of a Time-Dependent Temperature Gradient
1Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Entropy (Basel, Switzerland)
|January 24, 2025
Summary
Shifting oscillation frequency in nanoscale heat transport significantly alters hysteresis curves. This frequency switching creates unique patterns, impacting thermal device design.
Area of Science:
- Thermodynamics
- Nanoscale science
- Statistical mechanics
Background:
- Understanding heat transport in nanoscale systems is crucial for developing advanced thermal devices.
- Oscillating temperature gradients introduce complex dynamics not fully captured by static models.
- Stochastic energetics provides a framework for analyzing nonequilibrium systems.
Purpose of the Study:
- To investigate the impact of periodically shifting oscillation frequency on heat transport hysteresis in a nanoscale molecular model.
- To analyze the effects of frequency switching on heat flux and energy exchange between a system and its thermal baths.
- To explore the emergence of novel features in heat transport hysteresis curves due to dynamic frequency changes.
Main Methods:
- Application of a stochastic energetics framework.
- Derivation of analytical expressions for energy fluxes.
- Nonequilibrium molecular dynamics simulations for validation.
- Analysis of heat transport hysteresis curves under time-dependent oscillating temperature gradients.
Main Results:
- Heat transport hysteresis curves are significantly altered by shifting oscillation frequencies between fast and slow regimes.
- Frequency switching leads to the emergence of unique features like pinched loops and complex multi-loop patterns.
- Analytical predictions for energy fluxes show excellent agreement with simulation results.
Conclusions:
- Periodically shifting oscillation frequency is a key factor in controlling heat transport hysteresis at the nanoscale.
- The observed phenomena have direct implications for designing next-generation thermal neuromorphic devices.
- This study provides a foundation for engineering thermal memristors and memcapacitors with tailored properties.
Related Concept Videos
02:44Heating and Cooling Curves
22.4K
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
22.4K
01:14Mechanisms of Heat Transfer I
4.1K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
4.1K
01:21Joule-Thomson Effect
2.9K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
2.9K
01:20Mechanisms of Heat Transfer II
3.2K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
3.2K
01:21Time and frequency -Domain Interpretation of Phase-lag Control
83
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
83
01:19Mechanism of heat transfer
1.2K
Understanding heat transfer mechanisms is essential for understanding how our bodies maintain balance in different environmental conditions. When the environment is thermoneutral, the body is in a state of balance, neither using nor releasing energy to maintain its core temperature. However, when the environment is not thermoneutral, the body employs four heat transfer mechanisms to maintain homeostasis: conduction, convection, evaporation, and radiation. These mechanisms facilitate heat...
1.2K