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Why humans build fires shaped the same way.

Adrian Bejan1

  • 1Duke University, Department of Mechanical Engineering and Materials Science, Durham, North Carolina 27708-0300, USA.

Scientific Reports
|June 9, 2015
PubMed
Summary

Humans build fires that are as tall as they are wide, optimizing heat output. This optimal fire design, driven by natural convection, has historically facilitated human migration and expansion across the globe.

Area of Science:

  • Combustion Science
  • Anthropology
  • Physics

Background:

  • Humans have historically built fires with similar dimensions, often without explicit scientific understanding.
  • The physical structure of a fuel pile significantly influences combustion efficiency and heat output.

Purpose of the Study:

  • To investigate the optimal dimensions for a burning fuel pile.
  • To understand the underlying reasons for the consistent, seemingly unintentional, fire-building practices across human history.

Main Methods:

  • Analysis of fuel pile geometry and its effect on combustion.
  • Examination of natural convection within permeable fuel structures.
  • Historical and anthropological context of fire use in relation to human migration.

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Main Results:

  • The hottest burning fuel pile occurs when its height is approximately equal to its base diameter.
  • The permeable nature of fuel piles allows natural convection, driving efficient combustion.
  • This specific fire architecture has historically aided human population spread.

Conclusions:

  • The 'unwitting' human tendency to build fires with equal height and width is an optimal design for heat generation.
  • This efficient heat flow from fires has played a crucial role in facilitating human migration and global expansion throughout history.