Venturi Tube Fluid Mixer With Inflection Points In Divergent Section
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Solution Overview
Problem
Existing fluid mixers using the Venturi principle face flow separation issues in the divergent part, leading to pressure losses due to decelerated flow and sensitivity to fluid mixture separation.
Innovation Solution
The divergent section of the fluid mixer features a steady contour curve with at least two inflection points, optimizing the flow shape to minimize or delay separation and reduce losses, with the admixing opening moved into the convergent region to avoid immediate separation when mixing fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the admixing opening is positioned at the narrowest cross-section, then the second fluid can be effectively mixed with the first fluid, but flow separation occurs immediately in the divergent part causing pressure losses
Solution Approach 1:
The patent applies preliminary action by moving the admixing opening into the convergent section before the narrowest cross-section, allowing the second fluid to be mixed with the first fluid in a region where the flow is still accelerating. This preliminary mixing occurs before the flow enters the divergent section, preventing immediate flow separation and associated pressure losses that would occur if mixing happened at the narrowest cross-section.
Solution Approach 2:
The patent applies local quality by creating different flow conditions in different regions: the convergent section maintains accelerating flow with lower sensitivity to separation, while the divergent section handles the mixed fluid. By positioning the admixing opening in the convergent section, the mixture is formed in a locally optimized region that is less sensitive to flow separation, thereby reducing overall pressure losses.
2Ease of manufacture
If the divergent section has a simple contour, then manufacturing is easier, but flow separation occurs more readily causing pressure losses
Solution Approach 1:
The patent applies spheroidality by introducing a contour curve with inflection points in the divergent section, replacing a simple straight or uniformly curved geometry. This curved contour with specific inflection points optimizes the flow path, delaying flow separation and reducing pressure losses while remaining manufacturable through standard forming processes.
Solution Approach 2:
The patent applies parameter changes by modifying the geometric parameters of the divergent section, specifically introducing inflection points in the contour curve. These parameter changes optimize the flow characteristics, reducing flow separation and pressure losses without significantly complicating the manufacturing process.
3Stress or pressure
If the flow is decelerated in the divergent part, then static pressure increases, but flow separation occurs causing additional pressure losses
Solution Approach 1:
The patent applies preliminary action by completing the mixing process in the convergent section before the flow enters the divergent section. This allows the flow to be decelerated in the divergent section without immediate flow separation, as the mixture is already formed and the flow conditions are more favorable. The preliminary mixing reduces the sensitivity to flow separation during deceleration.
Solution Approach 2:
The patent applies local quality by creating different flow conditions in different regions: the convergent section handles the mixing process where flow acceleration occurs, while the divergent section handles the deceleration and pressure recovery. By positioning the admixing opening in the convergent section, the mixture is formed in a locally optimized region that is less sensitive to flow separation, thereby reducing overall pressure losses during the deceleration process.
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 design minimizes flow separation and associated pressure losses by ensuring the fluid mixture flows in a less sensitive region, maintaining close contact with the wall and reducing adverse effects on the flow.
Implementation Method 1
a first fluid, e.g. air, flows through the Venturi tube... a first convergent section is provided which extends from an inlet cross-section up to the narrowest cross-section of the Venturi tube
Implementation Method 2
a second divergent section is provided which extends from the narrowest cross-section up to the outlet cross-section... the speed of the fluid never reaches sonic speed
Data Source
AI summary
A fluid mixer in the form of a Venturi tube includes a divergent section (A2) with a steady contour curve having at least two inflection points (W1, W2) to reduce flow separations.