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Vaporization

Vaporization

The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...

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Related Experiment Video

Updated: Nov 1, 2025

Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment

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High-Efficiency Solar Vapor Generation Boosted by a Solar-Induced Updraft with Biomimetic 3D Structures.

Changwook Kim¹, Dongheok Shin¹, Monu Nath Baitha¹

¹School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.

ACS Applied Materials & Interfaces

|June 17, 2021

Summary

This summary is machine-generated.

This study introduces a novel 3D solar evaporator using biomimetic design and solar-induced airflow. The innovative system significantly enhances freshwater production efficiency through improved water-vapor exchange.

Keywords:

3D evaporator convection flower solar chimney solar vapor generation updraft

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Last Updated: Nov 1, 2025

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Process of Making Three-dimensional Microstructures using Vaporization of a Sacrificial Component

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Published on: November 2, 2013

Area of Science:

Materials Science
Environmental Engineering
Renewable Energy

Background:

Solar desalination offers a sustainable and cost-effective approach to freshwater generation.
Traditional solar evaporators face limitations in efficiency due to vapor diffusion and heat loss.

Purpose of the Study:

To develop a highly efficient biomimetic 3D solar evaporator.
To enhance solar vapor generation by utilizing solar-induced airflow.

Main Methods:

Implementation of a carbon-coated polyvinyl alcohol (PVA) foam for broadband solar absorption.
Integration of a convection flower (Amorphophallus titanum) and solar chimney structure to create an updraft airflow.
Utilizing the updraft to replace saturated vapor with dry air at the air-water interface.

Main Results:

Achieved perfect absorption of ultrabroadband sunlight with the carbon-coated PVA foam.
The bio-inspired 3D structure generated a significant solar-induced updraft airflow.
Demonstrated a high solar-vapor conversion efficiency of 95.9% under 1 sun conditions (1 kW m⁻²).

Conclusions:

The novel biomimetic 3D solar evaporator significantly boosts freshwater production efficiency.
Solar-induced airflow is a key factor in enhancing the performance of solar desalination systems.
This technology presents a promising advancement for sustainable freshwater generation.