Stirrer Recesses for Vertical Mixing
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Solution Overview
Problem
Conventional stirrers exhibit poor vertical mixing due to strong flow patterns in the rotational direction, leading to flow stagnation regions and reduced mixing efficiency, particularly in the upward/downward direction.
Innovation Solution
A stirrer design featuring a plurality of spirally arranged projections with semi-circular, semi-elliptical, or polygonal cross-sections on the inner surface, inclined at angles between 10° to 70°, along with grooves between them, to gradually change the flow from rotational to upward/downward direction, enhancing vertical mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a plate-shaped baffle is installed to improve vertical mixing, then the degree of mixing in the upward/downward direction is improved, but foreign substances are generated around the baffle and internal flow changes cause irregular particle shapes
Solution Approach 1:
The baffle is divided into multiple segments (first baffle segment and second baffle segment) separated by a gap, allowing fluid to pass through while still providing mixing action. This segmentation prevents foreign substance generation while maintaining vertical mixing effectiveness.
Solution Approach 2:
Different portions of the baffle structure have different properties - the first and second baffle segments are positioned at different locations with specific gap spacing, creating localized flow control that improves mixing without generating harmful foreign substances throughout the entire system.
2Productivity
If a plate-shaped baffle is installed to improve vertical mixing, then the degree of mixing in the upward/downward direction is improved, but rapid change of internal flow causes irregular particle shapes
Solution Approach 1:
The segmented baffle design with controlled gaps creates gradual flow transitions rather than abrupt changes, allowing particles to maintain regular shapes while still achieving effective vertical mixing through the distributed mixing action of multiple baffle segments.
Solution Approach 2:
The baffle structure is designed to work dynamically with the rotating impeller, where the gap between baffle segments allows controlled fluid passage that adapts to flow conditions, maintaining particle shape regularity while achieving vertical mixing.
3Device complexity
If conventional stirrer design is used, then the structure is simple, but the flow pattern deforms and flow stagnation regions are generated
Solution Approach 1:
The segmented baffle design adds minimal structural complexity while significantly improving flow pattern stability by eliminating stagnation regions through the gap that allows continuous fluid circulation between baffle segments.
Solution Approach 2:
The gap between baffle segments acts as an intermediary passage that mediates fluid flow, preventing stagnation by allowing continuous movement through the baffle structure while maintaining overall structural simplicity.
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 significantly reduces concentration deviation and maintains velocity distribution, thereby improving the degree of vertical mixing and preventing flow stagnation, as demonstrated by comparative studies with conventional baffles and ungrooved stirrers.
Implementation Method 1
A movement of liquid in the stirrer has a large influence on a stirring effect
Data Source
AI summary
The present invention relates to a stirrer having grooves formed on the inside of a container in order to improve the degree of mixing, and the stirrer which is provided comprises: a plurality of projections formed on the inner surface of a stirrer container; and a plurality of grooves formed between the plurality of projections.