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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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Transient Heat Conduction in the Orthotropic Model with Rectangular Heat Source.

Zeqing He1, Yingli Shi2, Yuqing Shen3

  • 1Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.

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|August 26, 2022
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Summary
This summary is machine-generated.

This study introduces an orthotropic heat transfer substrate to improve temperature uniformity in stretchable heaters for medical hyperthermia. The new design enhances thermal performance for epidermal electronic systems.

Keywords:
orthotropic substratestretchable rectangular heatertransient heat conductionuniform temperature distribution

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Heat Transfer

Background:

  • Epidermal electronic systems (EESs) offer advanced integration with human physiology, particularly for medical hyperthermia applications.
  • Stretchable heaters are crucial components in EESs, requiring stable electrical properties and uniform temperature fields.
  • Current inorganic stretchable heaters face challenges with uneven temperature distribution due to electrode spacing.

Purpose of the Study:

  • To propose and analyze an orthotropic heat transfer substrate for enhancing temperature uniformity in stretchable heaters.
  • To develop an analytical model for transient heat conduction in stretchable rectangular heaters with orthotropic properties.
  • To investigate the homogenization effect of orthotropic heat transfer on temperature distribution and its temporal evolution.

Main Methods:

  • Development of an analytical model for transient heat conduction in stretchable heaters.
  • Validation of the analytical model using finite element analysis (FEA).
  • Investigation of temperature distribution homogenization using the established model.

Main Results:

  • The proposed orthotropic heat transfer substrate effectively homogenizes the temperature field in stretchable heaters.
  • The analytical model accurately predicts transient heat conduction behavior.
  • The study elucidates the relationship between orthotropic properties, temperature distribution, and time.

Conclusions:

  • Orthotropic heat transfer substrates are beneficial for achieving uniform temperature distribution in stretchable heaters.
  • The developed analytical model provides insights into the transient heat transfer mechanisms.
  • This research aids in designing more effective stretchable heaters for thermotherapy and related applications.