A differential amplification liquid film sensor for measuring liquid film in narrow rectangular flow channels

Abstract

The present invention discloses a differential amplification liquid film sensor for measuring liquid films within narrow rectangular flow channels. The sensor comprises several sensor units, each of which includes a circular electrode, a first annular electrode, and a second annular electrode. The circular electrode, the first annular electrode, and the second annular electrode are sequentially arranged on the inner side, the middle, and the outermost side. The sensor designed in the present invention has the advantages of high measurement accuracy, wide applicability, and low manufacturing cost.

Description

Technical Field

[0001] The invention belongs to the field of liquid film thickness measurement, and in particular relates to a differential amplification liquid film sensor for measuring a liquid film in a narrow rectangular flow channel. Background Art

[0002] Narrow rectangular flow channels, due to their large specific surface area and strong heat transfer capacity, are widely used in the energy and power sector, where space is limited and heat transfer requirements are high, particularly in the heat exchange equipment and fuel assemblies of mobile nuclear reactor systems. However, during operation, mobile nuclear reactor systems are subject to complex external force fields, which cause the narrow rectangular flow channels to exhibit a series of complex external force field behaviors, such as swaying, rising and falling, and tilting. The coupling of these two factors further complicates the thermal-hydraulic phenomena and two-phase flow behavior within the narrow rectangular flow channels. As the design parameters and operating life of mobile nuclear reactor systems increase, the local deformation of fuel assemblies under complex external force fields and its impact on the safe operation of the reactor become more prominent.

[0003] Critical heat flux (CHF) is an important indicator for measuring the safety performance of heat exchange equipment associated with mobile nuclear reactor systems. Current research on critical heat flux prediction is based on the spatial distribution and evolution characteristics of the annular flow film. However, the measurement methods for annular flow films are limited and have low accuracy. Therefore, investigating the spatial distribution characteristics of annular flow films and their temporal evolution, as well as developing a new sensor for measuring annular flow films in narrow rectangular channels, are of great engineering significance.

[0004] The main methods for measuring liquid film thickness are currently divided into electrical measurement and optical measurement. Among them, the optical measurement method is expensive, while the existing electrical measurement method is low in cost but less accurate than the optical measurement method. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a differential amplification liquid film sensor for measuring the liquid film in a narrow rectangular flow channel, which has the advantages of high measurement accuracy, wide application range and low production cost.

[0006] To achieve the above-mentioned object, the present invention provides a differential amplification liquid film sensor for measuring a liquid film in a narrow rectangular flow channel, comprising:

[0007] A plurality of sensor units, each sensor unit comprising a circular electrode, a first annular electrode and a second annular electrode;

[0008] The circular electrode, the first annular electrode and the second annular electrode are arranged on the inner side, the middle and the outermost side in sequence.

[0009] Preferably, the circular electrode and the second annular electrode are receiving electrodes;

[0010] The first annular electrode is an emitter;

[0011] Wherein, the circular electrode is the first receiving electrode;

[0012] The second annular electrode is a second receiving electrode.

[0013] Preferably, the emitter is used to continuously provide an excitation signal in a fluid containing a gas phase and a liquid phase;

[0014] The receiving electrode is used to receive the excitation signal when the fluid containing different gas phase contents flows through the receiving electrode, and to process and analyze the excitation signal to obtain the liquid film thickness.

[0015] Preferably, the first receiving electrode is used to receive the excitation signal inside the transmitting electrode;

[0016] The second receiving electrode is used to receive an excitation signal outside the transmitting electrode.

[0017] Preferably, the process of processing and analyzing the excitation signal includes:

[0018] The fluid flowing through the sensor unit per unit time is measured as a whole by using the emitter inner excitation signal received by the first receiving electrode and the emitter outer excitation signal received by the second receiving electrode to obtain the fluid morphology; then the emitter inner excitation signal and the emitter outer excitation signal are compared and amplified to obtain the liquid film thickness.

[0019] Preferably, the differential amplification liquid film sensor as a whole is an electrode pair array composed of sensor units, and the number and size of the electrode pair array can be adjusted according to measurement accuracy requirements and measurement environment limitations.

[0020] Preferably, the left side of the differential amplification liquid film sensor as a whole further includes an external contact point for an excitation circuit;

[0021] The right side of the differential amplification liquid film sensor also includes an external contact point for a signal processing circuit;

[0022] The external connection points of the excitation circuit and the external connection points of the signal processing circuit can be adjusted automatically according to measurement requirements.

[0023] Preferably, the excitation circuit external contact point is used to connect to an external excitation circuit;

[0024] The excitation circuit is used to provide excitation signals to all emitters.

[0025] Preferably, the signal processing circuit external contact point is used for connecting to an external signal processing circuit;

[0026] The signal processing circuit is used to process the excitation signal received by the receiving electrode.

[0027] Preferably, the material of the sensor unit includes but is not limited to copper.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects:

[0029] The present invention provides a differential amplification liquid film sensor for measuring liquid films within narrow rectangular flow channels. This sensor utilizes an array of electrode pairs composed of sensor units, increasing the spatial range and flexibility of measurement. The number and size of the electrode pairs can be adjusted based on measurement accuracy requirements and environmental limitations, making them adaptable to various applications. Furthermore, the sensor utilizes PCB processing technology, resulting in low cost and simple manufacturing. Simultaneously, by arranging two receiving electrodes, it is possible to measure the entire flow of fluid through the sensor unit within a unit timeframe, thereby better reflecting the fluid's morphology. Furthermore, by comparing and processing the signals from the inner and outer receiving electrodes, it amplifies the measurement, resulting in more accurate measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0031] Figure 1 This is a schematic structural diagram of a sensor unit according to an embodiment of the present invention;

[0032] Figure 2 Schematic diagram of the overall structure of the differential amplification liquid film sensor according to an embodiment of the present invention;

[0033] Among them, 1. sensor unit; 2. external contact points of the excitation circuit; 3. external contact points of the signal processing circuit. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0036] Example 1

[0037] like Figure 1-2 As shown, this embodiment provides a differential amplification liquid film sensor for measuring a liquid film in a narrow rectangular flow channel, comprising:

[0038] A plurality of sensor units 1, each sensor unit 1 comprising a circular electrode, a first annular electrode and a second annular electrode;

[0039] The circular electrode, the first annular electrode and the second annular electrode are arranged on the inner side, the middle and the outermost side in sequence.

[0040] In a further optimization solution, the circular electrode and the second annular electrode serve as receiving electrodes;

[0041] The first annular electrode is an emitter;

[0042] Among them, such as Figure 1 As shown, the circular electrode is the receiving electrode I;

[0043] The second annular electrode is the receiving electrode II.

[0044] In a further optimized solution, the emitter is used to continuously provide an excitation signal in a fluid containing a gas phase and a liquid phase;

[0045] The receiving electrode is used to receive the excitation signal when the fluid containing different gas phase contents flows through the receiving electrode, and to process and analyze the excitation signal to obtain the liquid film thickness.

[0046] In a further optimization solution, the receiving electrode I is used to receive the excitation signal inside the transmitting electrode;

[0047] The receiving electrode II is used to receive the excitation signal outside the transmitting electrode.

[0048] A further optimization scheme includes the following steps:

[0049] The fluid flowing through the sensor unit 1 in unit time is measured as a whole by the emitter inner excitation signal received by the receiving electrode I and the emitter outer excitation signal received by the receiving electrode II to obtain the fluid morphology; then the emitter inner excitation signal and the emitter outer excitation signal are compared and amplified to obtain the liquid film thickness.

[0050] As a further optimization solution, the differential amplification liquid film sensor as a whole is an electrode pair array composed of sensor units 1, and the number and size of the electrode pair array can be adjusted according to measurement accuracy requirements and measurement environment limitations.

[0051] Further optimization solutions, such as Figure 2 As shown, the left side of the differential amplification liquid film sensor also includes an excitation circuit external contact 2;

[0052] The right side of the differential amplification liquid film sensor also includes a signal processing circuit external contact point 3.

[0053] The excitation circuit external connection point 2 and the signal processing circuit external connection point 3 can be adjusted automatically according to measurement requirements.

[0054] In a further optimization solution, the excitation circuit external contact point 2 is used for connecting an external excitation circuit;

[0055] The excitation circuit is used to provide excitation signals to all emitters.

[0056] In a further optimization solution, the signal processing circuit external contact point 3 is used to connect to an external signal processing circuit;

[0057] The signal processing circuit is used to process the excitation signal received by the receiving electrode.

[0058] As a further optimization solution, the material of the sensor unit 1 includes but is not limited to copper.

[0059] The present invention provides a differential amplification liquid film sensor for measuring liquid films within narrow rectangular flow channels. This sensor utilizes an array of electrode pairs composed of sensor units, increasing the spatial range and flexibility of measurement. The number and size of the electrode pairs can be adjusted based on measurement accuracy requirements and environmental limitations, making them adaptable to various applications. Furthermore, the sensor utilizes PCB processing technology, resulting in low cost and simple manufacturing. Simultaneously, by arranging two receiving electrodes, it is possible to measure the entire flow of fluid through the sensor unit within a unit timeframe, thereby better reflecting the fluid's morphology. Furthermore, by comparing and processing the signals from the inner and outer receiving electrodes, it amplifies the measurement, resulting in more accurate measurements.

[0060] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A differential amplification liquid film sensor for measuring liquid film in a narrow rectangular flow channel, characterized in that: include: A plurality of sensor units, each sensor unit comprising a circular electrode, a first annular electrode and a second annular electrode; The circular electrode, the first annular electrode, and the second annular electrode are sequentially arranged at the inner side, the middle side, and the outermost side; The circular electrode and the second annular electrode are receiving electrodes; The first annular electrode is an emitter; Wherein, the circular electrode is the first receiving electrode; The second annular electrode is a second receiving electrode; The emitter is used to continuously provide an excitation signal in a fluid containing a gas phase and a liquid phase; The receiving electrode is used to receive the fluid containing different gas phase contents when it flows through the receiving electrode. The excitation signal is processed and data analyzed to obtain the liquid film thickness; The first receiving electrode is used to receive the excitation signal inside the transmitting electrode; The second receiving electrode is used to receive the excitation signal outside the transmitting electrode; The process of processing the excitation signal and performing data analysis includes: The fluid flowing through the sensor unit per unit time is measured as a whole by using the emitter inner excitation signal received by the first receiving electrode and the emitter outer excitation signal received by the second receiving electrode to obtain the fluid morphology; the emitter inner excitation signal and the emitter outer excitation signal are then compared and amplified to obtain the liquid film thickness; The differential amplification liquid film sensor as a whole is an electrode pair array composed of sensor units, and the number and size of the electrode pair array can be adjusted according to the measurement accuracy requirements and measurement environment limitations; The left side of the differential amplification liquid film sensor as a whole also includes an external contact point for the excitation circuit; The right side of the differential amplification liquid film sensor also includes an external contact point for a signal processing circuit; The external contact points of the excitation circuit and the signal processing circuit can be adjusted automatically according to measurement requirements; The excitation circuit external contact point is used for connecting to an external excitation circuit; The excitation circuit is used to provide excitation signals to all emitters.

2. The differential amplification liquid film sensor for measuring liquid film in a narrow rectangular flow channel according to claim 1, characterized in that: The signal processing circuit external contact point is used for connecting to an external signal processing circuit; The signal processing circuit is used to process the excitation signal received by the receiving electrode.

3. The differential amplification liquid film sensor for measuring liquid film in a narrow rectangular flow channel according to claim 1, characterized in that: The material of the sensor unit includes but is not limited to copper.

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