Related Experiment Video
Updated: Oct 7, 2025
05:20
Characterization of Thermal Transport in One-dimensional Solid Materials
Published on: January 26, 2014
17.5K
Modelling Thermal Conduction in Polydispersed and Sintered Nanoparticle Aggregates.
Nikolaos P Karagiannakis1, Eugene D Skouras1,2, Vasilis N Burganos1
1Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology, Hellas (FORTH), GR-26504 Patras, Greece.
Nanomaterials (Basel, Switzerland)
|January 11, 2022
Summary
Nanoparticle aggregation significantly impacts nanofluid thermal conductivity. Polydispersity decreases conductivity, while sintering enhances it by creating wider conduction paths, with an optimal sintering degree for maximum heat performance.
Area of Science:
- Materials Science
- Thermodynamics
- Nanotechnology
Background:
- Nanoparticle aggregation is critical for nanofluid thermal properties.
- Existing studies often assume uniform particle sizes and point contacts, which is unrealistic.
- Real-world conditions involve particle size variations (polydispersity) and particle overlap (sintering).
Purpose of the Study:
- To investigate the effects of polydispersity and sintering on the effective thermal conductivity of nanoparticle aggregates.
- To develop a simulation method for creating polydispersed aggregates with controlled morphology.
- To model the sintering process considering mass conservation and particle overlap.
Main Methods:
- Developed a simulation method for generating polydispersed nanoparticle aggregates.
- Implemented a sintering model based on mass conservation and desired overlap.
- Analyzed the impact of varying polydispersity and sintering degrees on thermal conductivity.
Main Results:
- Elevated polydispersity levels led to a noticeable decrease in thermal conductivity compared to monodisperse aggregates.
- Sintered nanoaggregates exhibited improved thermal conductivity due to particle coalescence forming wider conduction paths.
- An optimal sintering degree was identified for maximizing heat performance improvements.
Conclusions:
- Particle polydispersity negatively affects nanofluid thermal conductivity.
- Sintering enhances thermal conductivity in nanoparticle aggregates by promoting particle fusion.
- Optimizing the sintering process is key to improving nanofluid heat transfer efficiency.
Keywords:
effective thermal conductivityheat conductionnanofluidparticle aggregatespolydispersitysinteringMore Related Videos
Related Concept Videos
01:14Mechanisms of Heat Transfer
683
Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
683
01:20Mechanisms of Heat Transfer II
3.6K
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...
3.6K
01:14Mechanisms of Heat Transfer I
4.8K
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.
4.8K
01:19Mechanism of heat transfer
1.5K
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...
1.5K