Flow Sensing Meter Using Packed Spheres for Accurate Measurement
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Solution Overview
Problem
Existing fluid flow measuring devices are limited in their adaptability and accuracy, particularly for fluids with viscosities outside a narrow range, and often suffer from poor reproducibility and flow restriction due to their reliance on critical orifice configurations and linear flow assumptions.
Innovation Solution
A fluid flow sensing device featuring a chamber filled with tightly packed, identical bodies (such as spherical balls) that directs fluid flow through indirect passages, allowing for differential pressure measurement and calculation of flow rates, enabling flexibility across various viscosities and flow rates without the need for orifice adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a restricted orifice is used to measure flow rate, then pressure drop can be determined, but the device becomes sensitive to orifice configuration variations and loses reproducibility
Solution Approach 1:
The single orifice is segmented into multiple identical bodies (e.g., spheres or cylinders) packed within the chamber. This segmentation eliminates the critical configuration issues of a single orifice while maintaining the pressure drop measurement capability. The multiple identical bodies ensure consistent flow paths and pressure differential across all units.
Solution Approach 2:
The invention changes the geometric parameter from a single orifice configuration to multiple identical bodies with standardized dimensions. This parameter change allows the device to maintain reproducibility across units while adapting to different fluid viscosities through the packed arrangement of multiple standardized elements.
2Measurement precision
If a restricted orifice is used, then flow rate can be measured, but the orifice significantly restricts the fluid flow rates it intends to measure
Solution Approach 1:
The single restricted orifice is divided into multiple smaller flow paths through the packed bodies. This segmentation reduces the restriction on any single flow path while collectively providing the necessary measurement capability. The fluid can flow more freely through the packed arrangement compared to a single restrictive orifice.
3Measurement precision
If a single orifice size is used, then the device works for a particular fluid viscosity, but it cannot easily be adjusted for other viscosities
Solution Approach 1:
The invention introduces dynamic adaptability by allowing the packed bodies to be removed and replaced with bodies of different dimensions. This enables the device to be reconfigured for different fluid viscosities while maintaining the same basic measurement principle. The standardized packing arrangement ensures that different body sizes can be systematically substituted to match different measurement requirements.
4Measurement precision
If flow passes through a restricted orifice, then pressure drop can be measured, but flow becomes non-linear or turbulent at high flow rates
Solution Approach 1:
The flow path is segmented into multiple parallel paths through the packed bodies, which distributes the flow and reduces turbulence. This segmentation maintains laminar flow conditions even at higher flow rates by preventing flow concentration in a single path, while still providing sufficient pressure drop for measurement.
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 device provides accurate and repeatable fluid flow rate measurements across a wide range of viscosities and flow rates, with minimal restriction and high reproducibility, and can be easily modified for different applications by swapping ball diameters, reducing the likelihood of blockages and maintaining laminar flow.
Implementation Method 1
means to determine a differential pressure between fluid adjacent the first end of the chamber and fluid adjacent the second end of the chamber
Data Source
AI summary
A fluid flow sensor includes a hollow cylindrical casing containing a large number of solid spheres of identical diameter, packed tightly together. Fluid inflow and fluid outflow blocks are mounted to opposite ends of the casing, forming a fluid-tight seal. The fluid inflow and outflow blocks each enclose a generally conical fluid chamber tapering from where it meets an end of an interior of the casing to a respective inlet passage or outlet passage. Circular grilles divide the casing from each fluid chamber and retain the spheres in place. A pressure differential across the casing is measured via side passages extending laterally from each fluid chamber. For a given fluid, a given casing diameter and a given sphere diameter, this pressure differential can be converted to a fluid flow rate.