Serrated Surface Geometry for Durable Frost Pattern Control
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Solution Overview
Problem
Current icephobic surfaces face challenges in providing long-term resistance to frosting due to degradation issues like mechanical wearing, and existing solutions do not effectively control frost formation on surfaces.
Innovation Solution
The development of a method and system to form an ice-resistant surface by determining optimal vertex angles and heights for ridges on a substrate, which are then used to create a serrated pattern that inhibits frost formation by enhancing dropwise condensation and suppressing frost growth in valleys, thereby creating a discontinuous frost pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional icephobic surfaces are used, then initial frost resistance is provided, but long-term resistance deteriorates due to mechanical wearing and degradation
Solution Approach 1:
The invention changes the geometric parameters of the surface structure by forming ridges with specific vertex angles (e.g., 30-60 degrees) and vertex heights (e.g., 10-100 micrometers) on the substrate. These controlled geometric parameters create a surface morphology that passively controls frost formation patterns, directing frost to grow only on ridge peaks while maintaining non-frosted valleys, thereby providing durable long-term frost resistance without relying on degradable coatings
Solution Approach 2:
The invention segments the continuous surface into discrete ridge structures with peaks and valleys. This segmentation creates spatially distinct zones where frost formation is controlled: frost accumulates on ridge peaks while valleys remain non-frosted. This segmented approach transforms the uniform frost coverage problem into a controlled spatial distribution, enhancing long-term reliability by creating a self-sustaining frost control pattern that resists degradation over time
2Object-affected harmful factors
If existing frost control methods are applied, then some frost formation is reduced, but effective control of frost formation patterns is not achieved
Solution Approach 1:
The invention applies local quality by creating surface regions with different frost-forming characteristics through the ridge structure. The ridge peaks have one frost formation property (frost accumulation) while the valleys have a different property (non-frosted or suppressed frost growth). This local differentiation of surface properties enables precise control over frost patterns, allowing the system to achieve high precision in directing where frost forms and where it does not
Solution Approach 2:
The invention implements preliminary anti-action by pre-forming the ridge structure on the substrate before frost formation occurs. The predetermined vertex angles and heights of the ridges are designed in advance to counteract and control the natural frost formation process. This pre-configured geometric structure passively directs frost to specific locations (peaks) while preventing it in other areas (valleys), achieving precise frost pattern control without requiring active intervention during the frosting process
3Ease of manufacture
If uniform surface treatment is used, then manufacturing is simple, but frost formation cannot be effectively controlled in specific patterns
Solution Approach 1:
The invention performs preliminary action by pre-forming the ridge structures with specific geometric parameters (vertex angles and heights) on the substrate before the frost formation process occurs. This advance preparation of the surface geometry enables the system to control frost patterns passively, as the pre-configured ridges automatically direct frost to peaks and prevent it in valleys. The preliminary structuring of the surface allows subsequent frost formation to follow the desired pattern without requiring complex real-time control or post-processing
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
This approach effectively delays and reduces frost formation by creating a non-frosted band on the surface, providing long-term resistance to frosting and minimizing ice adhesion strength, even under varying humidity conditions.
Implementation Method 1
enhancing dropwise condensation
Implementation Method 2
suppressing frost growth in valleys
Data Source
AI summary
A method of forming an ice resistant surface includes determining, based at least in part on a desired pattern of frost formation, a vertex angle for a ridge that is to be formed on a substrate. The method also includes determining, based at least in part on the desired pattern of frost formation, a vertex height for the ridge that is to be formed on the substrate. The method further includes forming a plurality of ridges on the substrate, where each ridge in the plurality of ridges has the vertex angle and the vertex height.