Five-Island Fluidic Circuit for Low-Temperature Oscillating Sprays

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Solution Overview

Problem

Existing fluidic systems struggle to produce reliable, oscillating sprays at a wide range of operating parameters, including varying temperatures and fluid viscosities, particularly in low temperature conditions.

Innovation Solution

A fluidic geometry with five power nozzles, five islands, and one throat, featuring a unique interaction chamber design with a cold step and sloping floor, which enhances turbulence and oscillation at lower fluid velocities, ensuring consistent spray patterns across a broad temperature range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional fluidic geometries (mushroom, three-jet island) are used, then spray oscillation is achieved at higher temperatures, but spray reliability deteriorates at low temperatures approaching or below freezing point

Engineering Contradiction:

Improvespray reliabilityVSAvoidoperating temperature range

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The interaction chamber is divided into multiple discrete zones by strategically positioned islands, creating five separate jet interaction regions. This segmentation allows each zone to independently contribute to spray oscillation, ensuring reliable operation across varying temperatures and fluid viscosities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The islands are positioned asymmetrically within the interaction chamber, with varying distances from the inlet and different orientations. This creates locally optimized flow patterns in each zone, with some areas promoting turbulence at low temperatures while others maintain stable oscillation at higher temperatures.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If fluid viscosity increases at lower temperatures, then spray oscillation stability deteriorates, but the five-island geometry maintains uniform spray patterns

Engineering Contradiction:

Improvespray pattern uniformityVSAvoidfluid viscosity

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The five-island configuration creates dynamically interacting jet streams that adapt to changing fluid conditions. As viscosity increases at lower temperatures, the additional islands provide alternative flow paths and interaction zones that maintain oscillation stability, preventing spray pattern degradation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The geometry is designed to exploit parameter changes in the fluid, particularly viscosity and temperature variations. The island positions and dimensions are optimized to create appropriate flow separation and reattachment patterns that maintain spray quality across the expected operating range of alcohol-based cleaning fluids.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If the interaction chamber geometry is simplified, then manufacturing ease improves, but spray oscillation performance deteriorates at low temperatures

Engineering Contradiction:

Improveinsert fabricationVSAvoidlow temperature spray performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The islands are positioned at different depths and orientations within the interaction chamber, utilizing three-dimensional space efficiently. This allows complex flow control functionality to be achieved without increasing the overall footprint or requiring multi-component assembly, maintaining ease of manufacture while enabling low-temperature oscillation.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 achieves robust oscillating sprays with uniform fan characteristics, maintaining performance from sub-freezing temperatures to ambient conditions, suitable for automotive applications with alcohol-based cleaning fluids.

Implementation Method 1

the fluid jets from the power nozzles interact to produce turbulent and shifting flow patterns

Methodology Applied

Scientific EffectTurbulence: Turbulence

Implementation Method 2

the fluid is dispensed as a fan-shaped cone in which a jet moves (i.e., oscillates) so as to create a spray

Methodology Applied

Scientific EffectOscillation:

Data Source

PatentUS20260027570A1Five island fluidic circuit for low temperature performance of alcohol-based aqueous mixtures

Publication Date: 2026.01.29 ABC TECH INC

AI summary

A fluidic geometry to produce uniform oscillating sprays is described. The geometry can be embodied as an insert, housing, or system in which an inlet feeds an interaction chamber. Four islands define the perimeter of an interaction chamber having a cloverleaf-like shape, with five power nozzles positioned symmetrically with narrowing walls feeding into this chamber. The chamber itself has a greater depth than the power nozzles owing to a step, and a fifth island is disposed on the central axis above the throat and beneath the upper-most, central power nozzle. This arrangement exhibits consistent cold and high temperature performance for a range of fluid compositions and operating conditions.