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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Capillarity in Fluid01:19

Capillarity in Fluid

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Surface Tension, Capillary Action, and Viscosity02:57

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Vaporization01:18

Vaporization

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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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Surface Tension and Surface Energy01:16

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When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Updated: Jun 12, 2025

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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Hydrodynamic solar-driven interfacial evaporation - Gone with the flow.

Jiawei Ren1, Jia Xu1, Shuangchao Tian1

  • 1Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, PR China.

Water Research
|September 19, 2024
PubMed
Summary

This study introduces a novel hydrodynamic solar evaporator that significantly boosts water evaporation rates for desalination. The innovative design achieves over 100 times natural evaporation, enabling efficient day-and-night operation.

Keywords:
Day-and-night operationDynamic solar-driven interfacial evaporationHydrodynamic evaporation systemSalt fouling removalUltra-high evaporation rateWaterwheel evaporator

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Evaporation is a classic desalination method.
  • Integrating water flow can enhance evaporation efficiency.
  • Natural evaporation rates are often insufficient for large-scale applications.

Purpose of the Study:

  • To develop a hydrodynamic solar-driven interfacial evaporation process.
  • To significantly increase water evaporation rates.
  • To address limitations of traditional evaporation techniques.

Main Methods:

  • Designed and assembled a waterwheel-structure solar interfacial evaporator using printed filter papers.
  • Utilized hydrodynamic principles to drive continuous rotation of the evaporator.
  • Investigated solar-driven interfacial evaporation under continuous water flow.

Main Results:

  • Achieved a water evaporation rate of 6.58 kg·m-2·h-1, over 100 times higher than natural evaporation.
  • Demonstrated continuous day-and-night operation.
  • Showcased self-cleaning of salt fouling and rapid solution distribution.

Conclusions:

  • The hydrodynamic solar-driven interfacial evaporation process overcomes vapor diffusion limitations.
  • The developed evaporator is effective for solar desalination, vapor production, and salt recovery.
  • This technology holds significant potential for industrial applications.