Double Venturi Flow Measurement Reduces Pressure Loss
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Solution Overview
Problem
Conventional venturi devices experience significant pressure loss due to friction in the constricted section, leading to increased load on pumps and reduced flow rate, making accurate flow rate measurements challenging.
Innovation Solution
A double venturi configuration with an inner and outer venturi, where flow is split between the two, allowing for a lower beta ratio in the inner venturi for accurate measurements and a higher beta ratio in the outer venturi to minimize overall pressure loss, supported by ribs for efficient flow transmission, and an adjustment valve for mixing pressure signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional venturi is used to measure flow rate, then accurate flow rate measurements can be obtained, but significant pressure loss occurs due to friction in the constricted section
Solution Approach 1:
The venturi is divided into two separate venturis (inner and outer) that operate in parallel. The inner venturi provides a constricted section for accurate pressure measurement, while the outer venturi provides a larger flow path to reduce overall friction losses. This segmentation allows each venturi to be optimized for its specific function.
Solution Approach 2:
Different sections of the flow path are given different characteristics: the inner venturi has a low beta ratio (high constriction) for accurate measurement in a localized area, while the outer venturi has a higher beta ratio (lower constriction) to minimize friction losses in the main flow path.
2Measurement precision
If a conventional venturi is used to measure flow rate, then flow rate can be measured, but increased pump load is required to compensate for pressure loss
Solution Approach 1:
By segmenting the flow into two parallel paths through inner and outer venturis, the system maintains measurement capability while reducing the total friction loss that would otherwise require increased pump power.
Solution Approach 2:
The beta ratios of the inner and outer venturis are specifically designed to be different, allowing optimization of the flow distribution and pressure characteristics to reduce pump load requirements while maintaining measurement accuracy.
3Measurement precision
If a conventional venturi is used, then flow rate measurement is possible, but overall flow rate is reduced due to friction
Solution Approach 1:
The flow is segmented into two parallel paths, allowing the outer venturi to handle the majority of flow with minimal constriction while the inner venturi handles a portion of flow for measurement purposes, thereby maintaining high overall flow rate.
Solution Approach 2:
The outer venturi is designed with a higher beta ratio to minimize friction losses for the bulk flow, while the inner venturi has a lower beta ratio for accurate measurement of a portion of the flow.
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 double venturi design achieves accurate flow rate measurements with reduced overall pressure loss compared to conventional venturis, maintaining higher flow rates and minimizing pump load, while allowing for precise pressure signal generation.
Implementation Method 1
The Venturi effect is the reduction in fluid pressure that results when a fluid flows through a constricted section (or choke) of a pipe
Data Source
AI summary
A double venturi may include an outer venturi and an inner venturi at least partially surrounded by the outer venturi. The double venturi may include an inner venturi inlet, an inner venturi throat, a high pressure inlet port located in the inner venturi inlet and a low pressure inlet port located in the inner venturi throat. The inner venturi and the outer venturi may be coaxial.