Bubble Detection in Flow Pipes via Thermal Differential
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Solution Overview
Problem
Existing bubble and droplet detection systems in fluid flow measurement pipes require additional components, such as ultrasound or optical measurements, which are cumbersome and limit the use of metal pipes, as they need partially transparent pipes.
Innovation Solution
A method using two heating elements arranged at different points on the pipe, with temperature sensors to detect temperature differences caused by bubbles or droplets, allowing for bubble detection based on thermal principles without requiring additional components or transparent pipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultrasound or optical measurement systems are used to detect bubbles or droplets, then detection capability is improved, but device complexity increases and metal pipe usage is limited
Solution Approach 1:
The patent combines the bubble detection function with the existing thermal flow measurement system by using the same heating elements and temperature sensors already present in the pipe. The temperature difference measurements taken for flow rate determination are also used to detect bubbles and droplets, eliminating the need for separate detection systems.
Solution Approach 2:
The heating elements and temperature sensors serve dual purposes: they measure both the flow rate of the fluid and detect the presence of bubbles or droplets. This multi-functional approach allows a single system to perform multiple measurement tasks without requiring additional specialized components.
2Measurement precision
If optical measurement systems are used to detect bubbles or droplets, then detection capability is improved, but adaptability decreases due to requirement for transparent pipes
Solution Approach 1:
The patent replaces optical detection methods with a thermal detection method that uses heating elements and temperature sensors. This substitution allows the system to work with any pipe material including metals, as it relies on thermal conduction through the pipe wall rather than optical transmission through the pipe.
3Productivity
If traditional flow measurement methods are used, then flow rate determination is achieved, but bubble or droplet detection capability is lost
Solution Approach 1:
The patent merges the flow measurement and bubble detection functions into a single integrated system. The same heating elements and temperature sensors used for flow rate determination are also used to detect bubbles and droplets by analyzing temperature differences, allowing simultaneous operation of both measurement capabilities.
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
Enables independent detection of bubbles or droplets regardless of flow velocity, suitable for metal pipes, and provides information on droplet size and flow direction by analyzing temperature differences across the pipe.
Implementation Method 1
heating the first heating element and the second heating element by means of electrical power
Implementation Method 2
simultaneously sensing the ambient temperature at the first measuring point by means of a first temperature sensor and the ambient temperature at the second measuring point by means of a second temperature sensor
Implementation Method 3
a (flowing) measuring medium transports heat away from a heated surface
Data Source
AI summary
A method for detecting bubbles or droplets of a first medium in a fluid second medium flowing through a measuring pipe includes: heating a first heating element and a second heating element, which are each arranged on the measuring pipe and at a distance from each other; simultaneously sensing a first ambient temperature at the first heating element by a first sensor and a second ambient temperature at the second heating element by a second sensor; determining a first variable of the first sensor corresponding to the first ambient temperature and a second variable of the second sensor corresponding to the second ambient temperature; forming a difference between the first variable and the second variable; and comparing an absolute value of the difference with a reference threshold value, wherein the presence of a bubble or droplet is detected when the absolute value at least briefly exceeds the reference threshold value.