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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 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 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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Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
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Related Experiment Video

Updated: Jul 31, 2025

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
07:32

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Published on: April 10, 2017

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Flow Boiling Heat Transfer Enhancement Using Tuned Geometrical Contact-Line Pinning.

Christopher Salmean1, Huihe Qiu1,2

  • 1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR 999077, P.R. China.

ACS Applied Materials & Interfaces
|May 2, 2023
PubMed
Summary
This summary is machine-generated.

Superbiphilic wettability patterns enhance microscale boiling by manipulating bubble dynamics. This study demonstrates improved heat transfer coefficients and critical heat flux using patterned surfaces, leading to more efficient heat removal.

Keywords:
Bubble dynamicsContact-line pinningFlow boilingMicrochannel boilingSilicon nanograssWettability patterning

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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
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Last Updated: Jul 31, 2025

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
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Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow
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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

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Area of Science:

  • Microscale heat transfer
  • Fluid dynamics
  • Surface science

Background:

  • Wettability patterning offers a route to control bubble dynamics in microscale boiling.
  • Achieving high heat fluxes at low wall temperatures is crucial for efficient thermal management.

Purpose of the Study:

  • To experimentally investigate flow boiling enhancement using superbiphilic wettability patterns.
  • To explore the impact of various geometries and orientations on bubble departure and heat transfer.
  • To develop a model for predicting bubble departure based on geometric factors.

Main Methods:

  • Fabrication of superbiphilic surfaces with symmetrical and asymmetrical superhydrophobic patches.
  • Creation of ring and chevron patterns using superhydrophilic cut-outs.
  • Experimental investigation of boiling performance, bubble dynamics, and heat transfer coefficients.
  • Development and validation of a geometric model for bubble departure.

Main Results:

  • Bubble departure is influenced by the interplay of local contact angle and hydrodynamic drag.
  • Ring-shaped patterns can trap droplets, enhancing heat transfer via latent heat.
  • Heterogeneous surfaces achieved a 62% increase in heat transfer coefficient and a 24% increase in critical heat flux compared to homogeneous surfaces.
  • A validated model for estimating bubble departure ease was established.

Conclusions:

  • Superbiphilic wettability patterns significantly enhance microscale flow boiling performance.
  • Contact-line pinning and droplet trapping are key mechanisms for heat transfer augmentation.
  • The developed geometric model provides a predictive tool for optimizing surface designs.