Microchannel Viscosity Measurement via Bubble Thermal Signature
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Solution Overview
Problem
Existing liquid viscosity measurement devices in microchannels are often oversized due to the use of electroacoustic transducers for detecting acoustic signals, which complicates the measurement process and increases device size.
Innovation Solution
A liquid viscosity measurement device that includes a substrate with a channel, a heating element to generate bubbles, and a temperature sensor to measure the bubble disappearance time period, allowing for viscosity derivation without the need for electroacoustic transducers, thereby reducing device size and maintaining accurate measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an electroacoustic transducer is used to detect acoustic signals for viscosity measurement, then the measurement function is achieved, but the device size increases
Solution Approach 1:
The patent replaces the electroacoustic transducer (acoustic detection system) with a temperature sensor-based detection system. Instead of detecting acoustic signals generated by bubble collapse, the invention measures temperature changes over time to determine viscosity, thereby eliminating the need for complex acoustic detection hardware and reducing device size.
Solution Approach 2:
The patent introduces temperature as an intermediary parameter to indirectly measure viscosity. Rather than directly detecting acoustic signals or mechanical properties, the system uses temperature changes during bubble generation and collapse as a mediator to derive viscosity information, enabling measurement with simpler sensors.
2Volume of moving object
If a temperature sensor is used instead of an electroacoustic transducer, then the device size is reduced, but measurement accuracy may be affected
Solution Approach 1:
The patent changes the measurement parameter from acoustic signals to temperature-time characteristics. By monitoring how temperature evolves during bubble generation and collapse, the system extracts viscosity information from thermal behavior rather than acoustic behavior, maintaining measurement capability while using simpler sensors.
Solution Approach 2:
The patent utilizes the phase transition of liquid to gas (bubble formation and collapse) as the measurement mechanism. By observing temperature changes associated with the phase transition process, the system derives viscosity without requiring acoustic detection, leveraging the thermal signature of the phase change event.
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 solution enables precise viscosity measurement of liquids by specifying the bubble disappearance time period, allowing for the derivation of viscosity values without increasing the device size, and does not alter the liquid characteristics during measurement.
Implementation Method 1
a heating element configured to generate a bubble in the liquid inside the channel
Implementation Method 2
a sensor configured to be placed in a vicinity of the heating element so as to measure a temperature
Data Source
AI summary
A liquid viscosity measurement device for measuring a viscosity of a liquid includes: a substrate; a channel configured to be installed on the substrate so that the liquid flows through the channel; a heating element configured to generate a bubble in the liquid inside the channel; a sensor configured to be placed in a vicinity of the heating element so as to measure a temperature; and a deriving unit configured to derive the viscosity of the liquid by specifying a bubble disappearance time period from generation to disappearance of the bubble based on a change in temperature obtained by use of the sensor, so that the viscosity of the liquid is derived based on the bubble disappearance time period.