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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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Mechanisms of Heat Transfer II01:20

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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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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 strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Updated: Jul 1, 2025

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Experimental and Theoretical Investigation on Heat Transfer Enhancement in Micro Scale Using Helical Connectors.

Malyne Abraham1, Zachary Abboud1, Gabriel Herrera Arriaga1

  • 1Mechanical Engineering Department, Bradley University, Peoria, IL 61625, USA.

Materials (Basel, Switzerland)
|March 13, 2024
PubMed
Summary

A novel helical connector enhances heat transfer in microchannels at low Reynolds numbers. This flow augmentation technique shows potential for improving cooling in microelectronics by optimizing fluid dynamics and nanoparticle behavior.

Keywords:
heat transfer coefficienthelical connectorhelical flowmicrochannelnanofluid

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Area of Science:

  • Thermal Management
  • Fluid Dynamics
  • Nanotechnology

Background:

  • Microscale electronics generate significant heat, necessitating advanced cooling solutions.
  • Traditional microchannel cooling faces challenges due to low Reynolds numbers and suboptimal fluid properties.
  • Improving heat transfer coefficients is critical for efficient thermal management.

Purpose of the Study:

  • To investigate the impact of a helical connector on heat transfer coefficients in microchannels at low Reynolds numbers.
  • To evaluate the potential of helical connectors for flow augmentation in microfluidic thermal management.
  • To explore the combined effects of helical connectors and nanofluids on heat transfer.

Main Methods:

  • Experimental testing of a microchannel system with an integrated helical connector.
  • Utilizing deionized water and a 0.1 wt% deionized water-diamond nanofluid as working fluids.
  • Analyzing heat transfer performance at low Reynolds number conditions.

Main Results:

  • The helical connector demonstrated significant potential for enhancing heat transfer coefficients, even at low Reynolds numbers.
  • The connector's effectiveness depends on its geometric characteristics, acting as a stabilizer or mixer.
  • Secondary flows induced by the helical connector can improve heat transfer by increasing molecular and nanoparticle motion.

Conclusions:

  • Optimized helical connectors can effectively augment heat transfer in microchannels at low Reynolds numbers.
  • Helical connectors offer a promising approach to overcome limitations in microscale thermal management.
  • Further optimization of nanoparticle characteristics and connector geometry is essential for maximizing heat transfer enhancement while managing viscosity.