Related Experiment Video
Updated: Jun 25, 2025
08:52
Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
Published on: April 30, 2018
8.1K
Numerical Investigation of Heat Transfer and Development in Spherical Condensation Droplets
Jian Dong1,2, Siguang Lu1, Bilong Liu1
1Key Laboratory of E&M, Zhejiang University of Technology, Hangzhou 310023, China.
Micromachines
|May 25, 2024
Summary
This study models droplet growth dynamics using thermodynamic principles and kinetic theory, revealing self-organizing growth laws. The findings improve condensation heat transfer surface design for microprocessor cooling.
Area of Science:
- Thermodynamics
- Fluid Dynamics
- Surface Science
Background:
- Understanding droplet growth is crucial for optimizing condensation heat transfer.
- Existing models lack detailed thermodynamic and kinetic insights into droplet self-organization.
- Surface properties significantly influence condensation dynamics and heat transfer efficiency.
Purpose of the Study:
- To establish thermodynamic assumptions and a mathematical formulation for droplet energy functionals.
- To derive a kinetic theory-based model for gas-liquid interface condensation rates.
- To analyze the influence of condensation environment and heat transfer on droplet growth stages.
Main Methods:
- Formulation of droplet energy functionals using the principle of least action.
- Derivation of a condensation rate model based on kinetic theory.
- Division of droplet growth into three stages based on volume thresholds (10^5 nm^3 and 10^10 nm^3).
- Analysis of surface condensation and heat transfer factors.
Main Results:
- Elucidation of self-organizing growth laws for condensed droplets.
- Explanation for the deviation from the Wenzel contact angle.
- Identification of critical thresholds influencing droplet growth dynamics.
- Model predictions show less than 3% error compared to experimental data.
Conclusions:
- The developed model accurately predicts droplet growth dynamics and condensation behavior.
- Insights gained can significantly enhance the design of condensation heat transfer surfaces.
- Improved designs are applicable to phase-change heat sinks in microprocessor chips.
Keywords:
condensation dropletdissipative structuredroplet growthenergy functionalheat transferthe principle of least actionMore Related Videos
Related Concept Videos
01:20Mechanisms of Heat Transfer II
3.2K
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...
3.2K
01:12Heat Flow and Specific Heat
5.4K
Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...
5.4K
01:14Mechanisms of Heat Transfer I
4.2K
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.
4.2K
01:25Heat Capacities of an Ideal Gas III
2.2K
The number of independent ways a gas molecule can move along straight line, rotate, and vibrate is called its degrees of freedom. Supposing d represents the number of degrees of freedom of an ideal gas, the molar heat capacity at constant volume of an ideal gas in terms of d is
2.2K
01:14Mechanisms of Heat Transfer
320
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...
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...
320
01:23Heat Capacities of an Ideal Gas II
2.4K
For a system that undergoes a thermodynamic process at a constant volume condition, the heat absorbed is used only to increase the system's internal energy and not for doing any kind of work. While for a system undergoing a thermodynamic process under a constant pressure condition, the amount of heat absorbed is used not only for increasing the internal energy (as a function of temperature) but also for doing some work. The molar heat capacity is the amount of heat required to increase the...
2.4K