Biscuit Element Static Mixer for Wall Smearing
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Solution Overview
Problem
Prior static mixers are expensive to manufacture and maintain due to complex machining requirements, and they often fail to achieve complete mixing, especially along conduit walls, due to 'wall smearing' caused by parabolic velocity profiles in laminar flow.
Innovation Solution
A high-efficiency mixing device with a biscuit element and secondary mixing elements within a conduit, featuring primary mixing elements that induce rotational angular velocity and parallel fluid paths, along with tertiary splayed baffles to enhance mixing efficiency beyond prior art capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional static mixers are used, then mixing is achieved through stationary elements, but manufacturing costs are high due to expensive machining and molding requirements
Solution Approach 1:
The mixing device is divided into multiple discrete mixing elements that can be independently manufactured and then assembled within the conduit. Each mixing element is a separate component that can be produced using standard machining or molding processes, avoiding the need for complex single-piece fabrication. The elements are positioned at specific intervals along the conduit length, creating a segmented mixing approach that reduces manufacturing difficulty and cost.
2Reliability
If traditional static mixers are used, then they provide extended useful life with no moving parts, but they fail to achieve complete mixing along conduit walls due to wall smearing
Solution Approach 1:
The mixing elements are designed with specific geometric features including angled surfaces and protrusions that create localized high-velocity regions and enhanced turbulence near the conduit walls. This local quality enhancement ensures that fluid layers adjacent to the walls are actively mixed rather than allowing wall smearing to occur. The elements generate complex flow patterns including rotation and chaotic advection that penetrate throughout the entire conduit cross-section.
3Ease of manufacture
If prior art static mixers are used, then they provide economical advantages over dynamic mixers, but they require permanent attachment between elements and conduit increasing device complexity
Solution Approach 1:
The mixing elements are designed to be self-positioning and self-retaining within the conduit. Each element incorporates geometric features such as angled entry surfaces and outward-facing protrusions that automatically guide the element into its correct position and prevent removal or rotation during operation. This self-service design eliminates the need for complex permanent attachment mechanisms while ensuring reliable operation, maintaining the economical advantage of static mixers without the attachment complexity.
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 device achieves significant mixing efficiency with reduced manufacturing costs and eliminates 'wall smearing' by creating rotational vortexes and ensuring complete fluid interaction, resulting in enhanced mixing performance.
Implementation Method 1
Each of said openings is provided with a mixing element which induces a rotational angular velocity to a fluid stream passing therethrough
Implementation Method 2
This provides parallel paths of fluids within the conduit enhancing the mixing process
Data Source
AI summary
A high efficiency mixing device for mixing first and second fluids within a conduit. A biscuit element is positioned at the upstream end of the conduit having a longitudinal axis that coincides with the longitudinal axis of the conduit. The biscuit element is provided with a plurality of openings including a central opening positioned along the longitudinal axis and a plurality of additional openings spaced proximate to the central opening. The openings are provided with primary mixing elements which induce a rotational angular velocity to a first fluid passing therethrough of the same rotational sign. Second fluid feed ports are positioned within each of the openings for introducing a second fluid to the first fluid as the first fluid passes through the openings and into the conduit. Secondary and tertiary mixing elements are optionally located downstream of the biscuit element to enhance the mixing of the first and second fluids.