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Related Concept Videos

Mechanisms of Heat Transfer01:14

Mechanisms of Heat Transfer

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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...
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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 Transfer I01:14

Mechanisms of Heat Transfer I

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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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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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Predicting Reaction Outcomes02:24

Predicting Reaction Outcomes

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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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Effect of Temperature Change on Reaction Rate02:28

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The Arrhenius equation,
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Preparation and Reactivity of Gasless Nanostructured Energetic Materials
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Thermally Activated Nitrogen/Heat Generating Reaction: A Kinetic Study.

Ali A Al-Taq1,2, Murtada Saleh Aljawad1,3, Olalekan Saheed Alade3

  • 1Department of Petroleum Engineering, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Saudi Arabia.

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This study investigated the heat-activated reaction kinetics between sodium nitrite and ammonium chloride. Results show ammonium chloride has a higher reaction order, offering insights for optimizing nitrogen generation in industrial applications.

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Area of Science:

  • Chemical kinetics
  • Industrial chemistry
  • Thermochemical reactions

Background:

  • Sodium nitrite and ammonium chloride are key thermochemicals in the oil and gas sector.
  • Previous research focused on acid-catalyzed kinetics; heat activation offers a novel control method.

Purpose of the Study:

  • To kinetically study the heat-activated reaction between sodium nitrite and ammonium chloride.
  • To determine the reaction order and activation energy under varying conditions.
  • To provide insights for controlling and optimizing nitrogen generation.

Main Methods:

  • Kinetic study of sodium nitrite and ammonium chloride reaction at 1-5 M concentrations and 50-90 °C.
  • Experiments conducted in both closed and open systems.
  • Monitoring of gas evolution and pressure generation.

Main Results:

  • The reaction kinetics were determined, showing a higher order for ammonium chloride than sodium nitrite.
  • Excess ammonium chloride enhanced the reaction, acting as both a catalyst and reactant.
  • The derived kinetic equation is dc/dt = -7.66 × 1011 C o 2.45 e (-91.44 extbackslash{}xa0kJ/mol)/.

Conclusions:

  • The heat-activated kinetics differ from previously reported acid-catalyzed kinetics, particularly regarding the reaction order of ammonium chloride.
  • Findings offer practical significance for controlling the reactivity and optimizing nitrogen generation in industrial settings.