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Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

5.1K
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.
5.1K
Mechanism of heat transfer01:19

Mechanism 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
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

3.7K
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...
3.7K
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

908
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...
908
Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

1.7K
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...
1.7K
Absorption of Radiation01:05

Absorption of Radiation

954
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Related Experiment Video

Updated: Nov 2, 2025

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

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Material Recognition via Heat Transfer Given Ambiguous Initial Conditions.

Tapomayukh Bhattacharjee, Henry M Clever, Joshua Wade

    IEEE Transactions on Haptics
    |June 16, 2021
    PubMed
    Summary
    This summary is machine-generated.

    Robots can now recognize materials by touch, even when humans get confused. Using advanced temperature sensing, robots achieve high accuracy in material identification, outperforming human capabilities in challenging thermal conditions.

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    Area of Science:

    • Robotics
    • Materials Science
    • Human-Computer Interaction

    Background:

    • Material recognition via thermal effusivity is effective at room temperature.
    • Distinct materials can cause temperature ambiguity during heat transfer, confusing both humans and robots.
    • Previous research highlights challenges in material discrimination under non-ideal thermal conditions.

    Purpose of the Study:

    • To investigate material recognition ambiguity caused by similar temperatures during heat transfer.
    • To compare human and robotic performance in discriminating materials under ambiguous initial conditions.
    • To develop and validate methods for robots to overcome thermal ambiguity in material recognition.

    Main Methods:

    • A psychophysical experiment involving 32 human participants and a robot discriminating between materials.
    • Utilizing a heat transfer model for mathematical proof of robotic sensing strategies.
    • Empirical testing of robotic material recognition with single and dual temperature sensors.

    Main Results:

    • Both humans and the robot exhibited confusion when discriminating materials under ambiguous initial conditions.
    • Robots equipped with two temperature sensors achieved 100% accuracy, significantly outperforming human accuracy (5%).
    • Robots with a single sensor demonstrated the ability to outperform humans by utilizing subtle thermal cues.

    Conclusions:

    • Thermal ambiguity poses a significant challenge for material recognition through physical contact.
    • Robots can overcome material recognition ambiguity using multi-sensor temperature data or by exploiting subtle cues.
    • This research offers insights into improving robotic material identification capabilities in complex thermal environments.