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Related Concept Videos

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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Conduction, Convection and Radiation: Problem Solving01:20

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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...
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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 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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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.
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...
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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Increasing Boiling Heat Transfer using Low Conductivity Materials.

Md Mahamudur Rahman1, Jordan Pollack1, Matthew McCarthy1

  • 1Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA, USA.

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Incorporating low-conductivity materials into boiling surfaces surprisingly enhances heat transfer. This method creates ordered liquid and vapor flows, boosting heat transfer rates over fivefold by optimizing bubble dynamics.

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Area of Science:

  • Heat Transfer
  • Materials Science
  • Fluid Dynamics

Background:

  • Boiling heat transfer is crucial for many industrial applications.
  • Enhancing heat transfer efficiency often involves complex surface modifications.
  • Existing methods can be prone to fouling and degradation.

Purpose of the Study:

  • To investigate a counterintuitive mechanism for enhancing boiling heat transfer.
  • To explore the effect of incorporating low-conductivity materials on heat transfer performance.
  • To understand how engineered thermal gradients influence fluid behavior during boiling.

Main Methods:

  • Embedding non-conductive lines into a high-conductivity substrate to create spatial temperature variations.
  • Systematically tuning the wavelength of temperature variations relative to the fluid's capillary length.
  • Quantifying heat transfer rates and observing bubble dynamics under different surface conditions.

Main Results:

  • A greater than 5x increase in heat transfer rate was achieved by replacing ~18% of the surface with non-conductive epoxy.
  • Spatial temperature variations promoted organized liquid and vapor flows.
  • A resonance-like effect was observed when the temperature variation wavelength matched the fluid's capillary length.

Conclusions:

  • Engineered thermal gradients offer a disruptive approach to high-efficiency boiling surfaces.
  • Optimized bubble dynamics, facilitated by ordered pathways, lead to efficient vapor removal and liquid replenishment.
  • This method presents a fouling- and degradation-insensitive alternative for high-heat-flux applications.