Engineered Roughness Elements for Dust Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Windblown dust emissions pose significant air quality degradation and environmental hazards due to the complex interplay of resisting and driving forces controlling the release and entrainment of dust-sized particles, with existing control measures being ineffective in reducing sand movement and airborne particulates.
Innovation Solution
Engineered roughness elements, designed with specific shapes, porosities, and configurations, are deployed in arrays to reduce shear stress and modulate wind flow, capturing sand grains at maximum kinetic energy heights and channeling particles into storage areas, with features allowing for movement, repositioning, and adaptability to wind conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dust control measures are used, then implementation is simple, but effectiveness in reducing sand movement and airborne particulates is insufficient
Solution Approach 1:
The roughness element is divided into multiple functional segments: a header portion for stability, a body portion with porous section for particle capture, and a nonporous section for structural support. This segmentation allows each part to perform its specific function optimally, resolving the contradiction between effectiveness and simplicity.
Solution Approach 2:
Different portions of the roughness element have different porosity characteristics - the porous section captures particles while the nonporous section provides structural integrity. This local differentiation of properties enables the element to achieve high dust control effectiveness without requiring complex overall structure.
2Reliability
If roughness elements are placed densely to maximize particle capture, then dust control effectiveness improves, but wind flow modulation and momentum extraction are reduced
Solution Approach 1:
The porous section of the roughness element allows wind flow to pass through while capturing particles, unlike solid barriers that completely block flow. This enables simultaneous particle capture and wind flow modulation, resolving the contradiction between capture efficiency and flow modulation capability.
Solution Approach 2:
The porous section provides partial particle capture rather than complete blockage, allowing excess wind flow to continue through the element. This partial action maintains both particle capture efficiency and wind flow modulation, avoiding the trade-off present in complete barrier approaches.
3Reliability
If roughness elements are fixed in position to ensure stability, then placement reliability improves, but adaptability to varying wind conditions is lost
Solution Approach 1:
The roughness element incorporates movable components that allow it to dynamically adjust its configuration in response to wind forces. The element can rotate or reposition itself to optimize particle capture under varying wind conditions while maintaining stability through its weighted header portion.
Solution Approach 2:
The roughness element uses the wind force itself to trigger adaptive movements - when wind exceeds threshold velocities, the element automatically repositions to maintain optimal orientation for particle capture, eliminating the need for external control systems.
4Reliability
If porous section is positioned at maximum kinetic energy height to capture particles, then particle capture efficiency improves, but structural stability is reduced
Solution Approach 1:
The porous section is strategically positioned at the height of maximum particle kinetic energy to optimize capture efficiency, while the nonporous section and header portion provide the structural strength and stability needed. This local specialization resolves the contradiction between capture efficiency and structural integrity.
Solution Approach 2:
The element is segmented into functional zones: the porous section at optimal height for particle interaction, supported by the structurally stronger nonporous section and header. This segmentation allows the capture-optimized porous portion to operate without compromising overall structural stability.
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 engineered roughness elements significantly reduce sand transport and dust emissions by stabilizing surfaces, extracting momentum from wind, and directing particles into controlled areas, enhancing dust control criteria through optimized design and placement.
Implementation Method 1
extracting momentum from wind
Implementation Method 2
having a porous section
Implementation Method 3
modulate wind flow
Data Source
AI summary
In one embodiment, the present disclosure provides an engineered roughness element. In another embodiment, the present disclosure provides an array of engineered roughness elements. The engineered roughness elements are configured to reduce sand movement and accompanying dust generation.