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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
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Heat capacity is the ratio of heat absorbed by the substance corresponding to its temperature change. It is also called thermal capacity and the SI unit of heat capacity is J/K. Whereas, specific heat capacity is defined as the amount of heat necessary to change the temperature of 1 kg of a substance by 1 K and is also called massic heat capacity. Its SI unit is J/kg⋅K.
Molar heat capacity quantifies the ratio of the amount of heat added (or removed) to increase (or decrease) the...
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For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...
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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Flujo de calor no local impulsado por corriente en plasmas ideales

Nicholas Mitchell1, David Chapman2, Grigory Kagan1

  • 1Imperial College, The Blackett Laboratory, London SW7 2AZ, United Kingdom.

Physical review. E
|December 23, 2025
PubMed
Resumen

Este estudio revela un nuevo mecanismo no local que mejora significativamente el flujo de calor impulsado por corriente en plasmas, particularmente en ionizaciones efectivas más altas. Estas mejoras ocurren incluso con flujos de electrones relativamente débiles, lo que impacta el transporte de energía del plasma.

Palabras clave:
flujo de calorplasmatransporte de energíafísica de plasmasionización

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Área de la Ciencia:

  • Física de Plasmas
  • Energía de Fusión
  • Plasmas Astrofísicos

Sus antecedentes:

  • El flujo de calor de electrones es un mecanismo dominante de transporte de energía en plasmas colisionales.
  • El transporte de calor no local debido a gradientes de temperatura está bien estudiado.
  • Los efectos no locales en el flujo de calor y la fricción impulsados por corriente siguen siendo menos explorados.

Objetivo del estudio:

  • Investigar los efectos no locales en el transporte impulsado por corriente utilizando un método cinético reducido de primeros principios.
  • Identificar y caracterizar nuevos mecanismos no locales que influyen en el flujo de calor impulsado por corriente.

Principales métodos:

  • Aplicación de un método cinético reducido de primeros principios.
  • Análisis de efectos no locales en el transporte impulsado por corriente.
  • Introducción y análisis del número de flujo adimensional N_u = |u_e - u_i| / v_{th,e}.

Principales resultados:

  • Un nuevo mecanismo no local mejora significativamente el flujo de calor impulsado por corriente.
  • Esta mejora es más frecuente para ionizaciones efectivas más altas (Z*).
  • Las mejoras ocurren para flujos débiles (N_u ≳ 1/100), análogos a los efectos no locales estándar.

Conclusiones:

  • El flujo de calor impulsado por corriente exhibe un comportamiento no local significativo más allá de los efectos impulsados por gradientes.
  • La intensidad de la corriente del plasma y la ionización efectiva son factores críticos en el transporte no local.
  • Los hallazgos son relevantes para comprender el transporte de energía en plasmas de fusión y astrofísicos.