Segmented Stirring Blade Layout for High-Reynolds Shear Mixing
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Solution Overview
Problem
Existing stirring devices struggle to efficiently apply shearing force to fluids with high Reynolds numbers, leading to inefficient mass transfer and prolonged residence times, particularly in fluids with large inertial forces.
Innovation Solution
A stirring blade design comprising plate-shaped members positioned at specific radial intervals and rotational speeds to generate a flow with a Reynolds number of 300 or more and a deformation rate tensor ratio of 0.8 or more, optimized through computational fluid dynamics (CFD) simulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional stirring blades are used to stir fluids with high Reynolds numbers, then the stirring device can operate, but the shearing force application is inefficient leading to poor mass transfer
Solution Approach 1:
The stirring blade is divided into multiple plate-shaped members (2 or more, 5 or less) arranged at different radial positions. This segmentation creates multiple flow paths and enhances shearing action throughout the fluid volume, improving mass transfer efficiency without requiring excessive energy input.
Solution Approach 2:
The plate-shaped members are positioned at specific radial intervals (1.5-2.5 times the plate width) to create localized high-shear regions where mass transfer is most needed. This localized approach concentrates energy where it provides maximum benefit rather than distributing it uniformly throughout the entire fluid volume.
2Productivity
If conventional stirring blades are used, then the device structure is simple, but the residence time required for effective mixing is prolonged
Solution Approach 1:
The plate-shaped members are designed to rotate at optimized speeds that dynamically adjust the flow patterns and shear rates. This dynamic operation creates more effective mixing action compared to static or conventionally designed blades, reducing the residence time required to achieve thorough mixing.
Solution Approach 2:
The multiple plate-shaped members are arranged at different radial positions and rotate to create three-dimensional flow patterns. This multi-dimensional mixing action is more effective than conventional two-dimensional stirring, significantly reducing the time required to achieve uniform mixing throughout the fluid volume.
3Productivity
If the stirring blade generates high shear flow with Reynolds number ≥300 and deformation rate ratio ≥0.8, then mass transfer is enhanced, but the device complexity increases
Solution Approach 1:
The invention optimizes specific parameters including the number of plate-shaped members (2-5), their radial spacing (1.5-2.5 times plate width), and rotational speed. By carefully controlling these parameters, the system achieves high mass transfer efficiency (Reynolds number ≥300, deformation rate ratio ≥0.8) without requiring complex mechanical structures or control systems.
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 design efficiently applies shearing force to fluids with high Reynolds numbers, enhancing mass transfer and mixing performance while maintaining energy efficiency.
Implementation Method 1
a flow of the fluid in which a Reynolds number is 300 or more is generated
Implementation Method 2
a ratio of a deformation rate tensor with respect to a velocity gradient tensor of the fluid that is a sum of the deformation rate tensor and a rotational speed tensor is 0.8 or more
Data Source
AI summary
A stirring blade that stirs a fluid by rotating around a rotary shaft, in which a flow of the fluid in which a Reynolds number is 300 or more and a ratio of a deformation rate tensor with respect to a velocity gradient tensor of the fluid that is a sum of the deformation rate tensor and a rotational speed tensor is 0.8 or more in a region of 5% or more in the flow is generated.