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Related Concept Videos

Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
Specific Heat01:16

Specific Heat

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For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or 4186 J/kg/K.
Quantifying Heat02:46

Quantifying Heat

Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the atoms and...
Theory of Metallic Conduction01:17

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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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Thermal Stress01:09

Thermal Stress

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Related Experiment Video

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Characterization of Thermal Transport in One-dimensional Solid Materials
05:20

Characterization of Thermal Transport in One-dimensional Solid Materials

Published on: January 26, 2014

A direct method to calculate thermal conductivity and its application in solid HMX.

Y Long1, J Chen, Y G Liu

  • 1Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, PO Box 8009, Beijing 100088, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 12, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a new formula for calculating heat flux, improving thermal conductivity predictions for complex materials like octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX). Results show distinct thermal conduction anisotropy in HMX crystals.

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Area of Science:

  • Computational materials science
  • Thermodynamics
  • Solid-state physics

Background:

  • Calculating thermal conductivity in complex materials is difficult.
  • Accurate heat flux calculation is crucial for material property analysis.
  • Octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) is a key explosive material.

Purpose of the Study:

  • To derive a concise formula for heat flux calculation.
  • To investigate the thermal conduction properties of HMX.
  • To analyze the temperature- and composition-dependence of thermal conductivity.

Main Methods:

  • Derivation of a heat flux formula based on the equation of motion.
  • Application of the formula to study HMX thermal conduction.
  • Experimental validation of computational results.

Main Results:

  • A novel, concise formula for heat flux calculation was derived.
  • Thermal conduction properties of HMX were studied, showing good agreement with experiments.
  • Distinct thermal conduction anisotropy was observed in HMX single crystals.
  • Temperature- and composition-dependence of HMX thermal conductivity were investigated.

Conclusions:

  • The derived formula provides an efficient method for thermal conductivity calculations.
  • The study reveals significant thermal conduction anisotropy in HMX.
  • Findings offer insights into the thermal behavior of energetic materials.