Gas-Retaining Surface Covering for Stable Underwater Air Layers
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Solution Overview
Problem
Existing technologies fail to permanently separate a submerged body from surrounding liquid using a layer of air, as air escapes and dissolves in the water, limiting the immersion time and effectiveness in technical applications.
Innovation Solution
A gas-retaining layer is designed for a body that can be immersed in a liquid, featuring a hydrophobic surface with recesses or projections, and a gas-permeable layer connected to a gas supply device, maintaining a constant gas volume and separating the body from the liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a natural surface structure is used to trap air, then buoyancy and breathing are improved, but the air layer diminishes over time due to gas detachment and dissolution
Solution Approach 1:
The surface is divided into numerous hydrophobic recesses or cavities that individually trap air pockets. This segmentation prevents complete air loss by providing multiple isolated reservoirs, extending the duration the air layer can maintain separation from the liquid.
Solution Approach 2:
The surface structure incorporates regions with different properties: hydrophobic surfaces for air retention in recesses, and potentially hydrophilic regions for controlled gas exchange. This local differentiation allows the surface to simultaneously retain air for buoyancy while managing gas dissolution rates.
2Reliability
If a gas-retaining layer with hydrophobic surface is used, then permanent separation from liquid is achieved, but device complexity increases
Solution Approach 1:
The gas-retaining layer is implemented as a thin film or coating with integrated hydrophobic recesses, rather than a thick rigid structure. This thin-film approach provides reliable liquid separation while minimizing added complexity and weight, making the system practical for various applications.
Solution Approach 2:
The surface covering combines multiple materials or structures: a base material providing mechanical strength, hydrophobic coatings or treatments for air retention, and potentially porous structures for gas permeability. This composite approach achieves reliable separation without requiring each component to be overly complex.
3Stability of the object's composition
If gas is continuously supplied through a gas-permeable layer, then constant gas volume is maintained, but energy consumption increases
Solution Approach 1:
The system uses the body's own movements or environmental conditions to drive gas exchange. For example, flexing of the body or pressure changes during operation naturally force gas through the permeable layer, eliminating or reducing the need for active pumping and associated energy consumption.
Solution Approach 2:
Instead of continuous gas supply, the system utilizes periodic pressure changes or movement cycles that naturally drive gas through the permeable layer at appropriate intervals. This periodic action maintains gas volume stability while significantly reducing average energy consumption compared to continuous supply.
4Productivity
If hydrophobic projections are used to retain gas, then flow resistance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies ranges for projection parameters (size, spacing, shape) rather than requiring exact dimensions. By defining acceptable parameter ranges that all provide sufficient flow resistance reduction, the manufacturing precision requirements are relaxed while maintaining the functional benefit.
Solution Approach 2:
Rather than requiring perfectly optimized projection geometry, the system uses sufficiently dense or pronounced projections that provide adequate flow resistance reduction even with manufacturing variations. This partial optimization approach achieves acceptable flow efficiency without demanding extreme manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains a permanent separation between the body and liquid, reducing corrosion and fouling, while minimizing flow resistance and extending immersion time by maintaining a stable gas layer.
Implementation Method 1
the gas-retaining layer (10) has, at least partially, recesses or depressions (30) on the liquid-facing side (10a), the surfaces of which are at least partially hydrophobic
Implementation Method 2
a gas layer (5) held in the immersed region of the gas-retaining layer (10) separates the liquid (4) and the immersed region of the body (2) from each other at least partially
Implementation Method 3
a gas-permeable layer (12) which is arranged on the gas-retaining layer (10) on a body-facing side (10b) opposite the liquid-facing side (10a)
Data Source
Figure 1
Figure 2
Figure 3a~3f
AI summary
The invention relates to a gas-retaining surface covering for a body contactable with a liquid, as well as a corresponding arrangement and use.