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Related Concept Videos

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

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.
Mechanism of heat transfer01:19

Mechanism of heat transfer

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

Conduction, Convection and Radiation: Problem Solving

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...
Absorption of Radiation01:05

Absorption of Radiation

The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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 heat.

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Inverse modeling for heat conduction problem in human abdominal phantom.

Ming Huang1, Wenxi Chen

  • 1University of Aizu, Aizu-wakamatsu, Fukushima 965-8580, Japan. d8112102@u-aizu.ac.jp

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
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This study developed a mathematical model to estimate internal body temperature using skin surface sensors. The quasi-linear method accurately reconstructed temperature distribution in a human abdomen phantom.

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Area of Science:

  • Biomedical Engineering
  • Medical Physics
  • Heat Transfer

Background:

  • Noninvasive deep body temperature measurement is challenging due to difficulties in determining sensor placement.
  • Accurate internal temperature monitoring is crucial for medical diagnosis and treatment.

Purpose of the Study:

  • To evaluate the feasibility of estimating internal organ temperature distribution using surface temperature sensors.
  • To develop and validate a mathematical model for noninvasive deep body temperature estimation.

Main Methods:

  • A 2-dimensional mathematical model of a human abdomen phantom was created.
  • The quasi-linear (QL) method was employed to solve the inverse heat conduction problem (IHCP).
  • Sensor accuracy and arrangement were optimized to improve temperature reconstruction.

Main Results:

  • The QL method successfully reconstructed internal temperature distribution in the phantom.
  • Optimizing sensor accuracy and arrangement led to accurate convergence.
  • The study demonstrated the potential of the QL method for noninvasive temperature mapping.

Conclusions:

  • The QL method is a viable approach for reconstructing internal temperature distribution from surface measurements.
  • Further research in anatomical models is warranted to explore clinical applications.
  • This method shows promise for advancing noninvasive deep body temperature monitoring.