Aquaculture Diffuser Flow Paths to Limit Bubble Coalescence

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Solution Overview

Problem

Existing oxygenation systems for aquaculture fail to efficiently disperse and dissolve oxygen bubbles in water, leading to inadequate contact time and increased bubble coalescence, which affects oxygen transfer efficiency.

Innovation Solution

An aquaculture diffuser with specific passageway configurations that promote axial and radial flow transitions, including intensifiers and expansion chambers, to enhance turbulent kinetic energy dissipation and prolong bubble contact time, while inhibiting initial upward entrainment and coalescence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional diffusers are used to inject oxygen bubbles into water, then oxygen injection is achieved, but bubble contact time is insufficient and coalescence occurs reducing efficiency

Engineering Contradiction:

Improveoxygen transfer efficiencyVSAvoidbubble contact time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The diffuser is divided into multiple functional zones: an injection zone with upwardly extending passageways for bubble generation, a lateral redirection zone with radially extending passageways for flow direction change, and an intensification zone with turbulence promoters. This segmentation allows each zone to perform its specific function optimally, preventing premature coalescence and extending contact time.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions the oxygen-injected water from axial upward flow to radial outward flow, changing the flow dimension. This dimensional transition redistributes bubbles laterally across the water body, increasing dispersion and contact time while preventing vertical coalescence that would occur in simple upward flow.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If simple passageways are used for oxygen injection, then device complexity is low, but oxygen dissolution efficiency is insufficient

Engineering Contradiction:

Improveoxygen dissolution efficiencyVSAvoidpassageway configuration complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Turbulence promoters act as intermediary elements within the passageways, creating controlled turbulence that enhances gas-liquid contact and oxygen dissolution. These intermediaries transform simple passageways into efficient mixing zones without requiring complex external mechanisms.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system utilizes hydraulic principles by designing passageways that redirect water flow radially outward and incorporate turbulence promoters. The hydraulic design creates natural mixing and dissolution through flow patterns rather than requiring additional mechanical energy input.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Productivity

If oxygen-injected water flows directly upward, then injection is simple, but initial upward entrainment promotes bubble coalescence

Engineering Contradiction:

Improveoxygen transfer efficiencyVSAvoidbubble coalescence

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

Instead of allowing continuous upward flow that promotes coalescence, the system inverts the flow direction by redirecting oxygen-injected water laterally through radially extending passageways. This inversion of the expected flow path disperses bubbles horizontally, preventing vertical coalescence and improving dissolution efficiency.

Inventive Principle:

Principle #13The other way round (Inversion)

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 diffuser system increases oxygen dissolution by promoting prolonged contact time and reducing bubble coalescence, enhancing oxygen transfer efficiency and concentration in water.

Implementation Method 1

enhance turbulent kinetic energy dissipation

Methodology Applied

Scientific EffectTurbulence: Turbulence

Implementation Method 2

increases oxygen dissolution by promoting prolonged contact time

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS20260083105A1Oxygenation assembly for aquaculture, and diffuser thereof

Publication Date: 2026.03.26 POSEIDON OCEAN SYSTEMS LTD

AI summary

There is provided an oxygenation assembly and an aquaculture diffuser thereof. The diffuser includes a plurality of circumferentially spaced-apart gas injection ports. The diffuser includes a plurality of circumferentially spaced-apart and axially-extending passageways. Each axially-extending passageway aligns with a respective one of the gas injection ports. Each axially-extending passageway is shaped to receive a mixture of water and oxygen-containing gas therethrough. The diffuser includes a plurality of circumferentially spaced-apart and radially outwardly-extending passageways. Each radially-extending passageway is in fluid communication with a respective one of the axially-extending passageways. Each said passageway may include an intensifier or constriction between proximal and distal end portions thereof. The diffuser may include a plurality of circumferentially spaced-apart expansion chambers each positioned between and in fluid communication with a respective said axially-extending passageway and a corresponding respective said radially-extending passageway. The diffuser is shaped to induce a homogeneous ramping turbulent kinetic energy (TKE) dissipation field.