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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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Mechanisms of Heat Transfer I01:14

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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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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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Mechanisms of Heat Transfer01:14

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Specific Heat01:16

Specific Heat

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The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
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Heat-pipe Earth.

William B Moore1, A Alexander G Webb

  • 1Department of Atmospheric and Planetary Sciences, Hampton University, Hampton, Virginia 23668, USA. william.moore@hamptonu.edu

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Summary
This summary is machine-generated.

Early Earth

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Area of Science:

  • Geodynamics
  • Early Earth Evolution
  • Planetary Science

Background:

  • Current models for early Earth's heat transport and lithospheric dynamics (plate tectonics, vertical tectonics) lack global synthesis with geologic evidence.
  • Existing models fail to fully explain the planet's early thermal and geological history.

Purpose of the Study:

  • To investigate the heat-pipe model as a dominant mechanism for early Earth's surface heat transport.
  • To reconcile geodynamic processes with the geologic record of the early Earth.

Main Methods:

  • Numerical simulations of the heat-pipe model.
  • Comparison of simulation outputs with the geologic record of early Earth.

Main Results:

  • The heat-pipe model simulations predict a cold, thick lithosphere due to extensive volcanism.
  • Model results align with geologic evidence of rapid volcanic resurfacing and contractional deformation.
  • Simulations show a decline in heat-pipe volcanism preceding the onset of plate tectonics.

Conclusions:

  • The heat-pipe Earth model provides a coherent geodynamic framework for understanding pre-plate tectonics Earth.
  • This model explains the transition from early volcanic dominance to modern plate tectonics.
  • It offers a unified explanation for early Earth's lithospheric dynamics and heat transport.