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Related Concept Videos

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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A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
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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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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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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase...
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Repeated Cyclogenesis on Hot-Exoplanet Atmospheres with Deep Heating.

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Area of Science:

  • Exoplanetary Science
  • Atmospheric Physics
  • Computational Astrophysics

Background:

  • Current models of hot exoplanet atmospheres often assume shallow atmospheric heating.
  • This assumption leads to a strong day-night temperature difference near the atmosphere's upper layers.

Purpose of the Study:

  • To investigate the impact of energy deposition at various depths within a model hot gas-giant exoplanet.
  • To compare atmospheric dynamics under shallow versus deep heating scenarios.

Main Methods:

  • High-resolution atmospheric flow simulations were conducted.
  • Idealized thermal heating was applied at different pressure levels (shallow: ~10^3 Pa, deep: ~10^5 Pa).

Main Results:

  • Deep heating resulted in a novel dynamic equilibrium state, unlike shallow heating.
  • This state featured the recurrent formation of massive cyclonic storms moving westward.
  • Storm formation correlated with increased turbulence, small-scale structures, and large-scale temperature mixing within ~3 planetary rotations.

Conclusions:

  • The type of atmospheric heating significantly influences emergent thermal flux in hot exoplanets.
  • These distinct thermal signatures are potentially distinguishable by current observational methods.
  • Simulations suggest observable differences in thermal flux over hundreds of days, despite excluding certain complex physical effects.