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Related Concept Videos

Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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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.
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Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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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...
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Mechanism of heat transfer01:19

Mechanism of heat transfer

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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...
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Temperature and Thermal Equilibrium01:11

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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Joule-Thomson Effect01:21

Joule-Thomson Effect

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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.
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Heat Transfer in Carbon-Nanotube Dispersions: A Simulation Study of the Role of Nanotube Morphology and Connectivity.

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Related Experiment Video

Updated: Jul 4, 2025

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

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Thermal Conduction in Hybrid Nanofluids and Aggregates.

Eugene D Skouras1,2, Nikolaos P Karagiannakis1, Vasilis N Burganos1

  • 1Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology, Hellas (FORTH), GR-26504 Patras, Greece.

Nanomaterials (Basel, Switzerland)
|February 9, 2024
PubMed
Summary

Hybrid nanofluids with tailored nanoparticle aggregation significantly enhance thermal conductivity. Core-shell structures and low fractal dimensions improve heat transfer in these advanced fluid systems.

Keywords:
aggregate morphologyeffective thermal conductivityheat conductionhybrid nanofluidnanoparticle aggregates

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Characterization of Thermal Transport in One-dimensional Solid Materials
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Fluid Dynamics

Background:

  • Hybrid nanofluids, containing multiple nanoparticle types, offer superior thermofluidic properties over single-component nanofluids.
  • These advanced systems aim to enhance thermal and mass transport for diverse applications.

Purpose of the Study:

  • Investigate the impact of nanoparticle aggregation on the thermal conductivity of hybrid nanofluids.
  • Develop a method for controlled reconstruction of particle configurations beyond random mixing.

Main Methods:

  • Utilized meshless methods to predict thermal efficiency based on reconstructed particle configurations.
  • Developed an algorithm for creating core-shell type nanoparticle clusters with controllable properties (fractal dimension, particle distribution).

Main Results:

  • Nanoparticle dispersion and aggregation significantly influence hybrid nanofluid thermal properties.
  • Aggregate shape (fractal dimension) and core-shell structure strongly affect thermal conductivity, even at low volume fractions.
  • High-conducting core/low-conducting shell configurations and low fractal dimensions (promoting continuous pathways) enhance conductivity.

Conclusions:

  • Controlled nanoparticle aggregation is crucial for optimizing hybrid nanofluid performance.
  • The presented reconstruction method allows for tailoring nanofluid properties for improved thermal transport.
  • Understanding aggregate morphology is key to designing efficient hybrid nanofluids for advanced applications.