The invention relates to a concentric three-electrode liquid film measurement sensor which comprises a circular excitation electrode E positioned in the center of a circle, an annular reception electrode A positioned in the inner ring and an annular reception electrode B positioned in the outer ring, and the three electrodes are smoothly embedded into the same cross section in the inner wall of ameasurement pipe in a concentric way. The invention also provides a scaling method for relation between the output ratio between the two reception electrodes of the sensor and the liquid film thickness as well as a gas-liquid/oil-gas-water multiphase-flow type distributed conductance measurement method for the thickness of the liquid film.

Gas-liquid/oil-gas-water multiphase-flow type distributed conductance measurement method for thickness of liquid film

The invention relates to a device and method for measuring liquid film thickness in a falling film microchannel and a hydrodynamic behavior by utilizing a stereo microscope. The device includes a stereo microscope, a falling film microchannel, an injection pump, a peristaltic pump, a cooling circulating pump, a constant-temperature bath, a data collecting and processing device, etc. The method includes performing scanning on the blank falling film channel by adopting the stereo microscope to obtain two-dimensional cross-section coordinate information of the channel, and taking this as a base line; performing feeding on a falling film system by adopting the injection pump, performing data collection on the falling film channel by using the stereo microscope when the liquid phase is stable,comparing a result and base line information of first collection, obtaining an apparent liquid film thickness value according to two obtained cross-sectional ordinate difference, and obtaining the liquid film thickness in falling film channel after correction is performed on the film thickness by utilizing the basic physical property of falling film liquid. Observation of the liquid phase on microchannel wetting behaviors and hydrodynamic behaviors like liquid phase flow pattern in microchannels can be realized by adopting the device. The device and the method are easy in installation, simplein operation and high in measurement precision, and non-contact measurement.

Device and method for measuring liquid film thickness in falling film microchannel and hydrodynamic behavior by utilizing stereo microscope

The invention relates to an annular-flow liquid film collecting and metering device. The annular-flow liquid film collecting and metering device comprises three parts, namely a permeating collection system, a flow control system and a metering weighing system, wherein the permeating collection system comprises a porous permeating pipe, a transparent sleeve, a drain valve, a three-way valve and a control valve; the middle section of the porous permeating pipe is a porous section; the porous section is made of a porous filter core sintered material and is positioned in the transparent sleeve; aflow-guiding hole is formed in the lower part of the transparent sleeve; after a fluid permeating out of the porous section flows out from the flow-guiding hole, the fluid flows through the three-wayvalve first and then flows through the control valve to enter a water storage container of the metering weighing system; after gas and liquid separation in the water storage container, gas is meteredby the flow control system and is emitted and liquid is stored in the water storage container; the side of the three-way valve leads to the outside through the drain valve. Through precise control andmetering of the gas emission volume, complete collection of a liquid film can be achieved, and the average flow of the liquid film is obtained.

Annular-flow liquid film collecting and metering device

The invention relates to an annular flow liquid membrane separation and mass metering method. An adopted device comprises a permeation collecting system, a flow control system and a metering weighingsystem; the permeation collecting system comprises a porous permeation pipeline, a sleeve, a blow-down valve, a three-way valve and a control valve; the middle section of the porous permeation pipeline is a porous section and is located inside the sleeve, a flow guiding hole is formed in the lower portion of the sleeve, fluid permeating from the porous section flows out through the flow guiding hole, the fluid flows through the three-way valve and enters a water storage container of the metering weighing system after passing through the control valve, after liquid and gas separation is performed in the water storage container, gas is metered through the flow control system and exhausted, and liquid is stored in the water storage container. The flow control system comprises a float flowmeter and an exhaust valve. When gas and liquid two-phase fluids flow through the porous permeation pipeline, mass metering is performed on a separated liquid membrane; the exhaust amount is precisely controlled and metered, the liquid membrane can be completely collected, and the average flow rate of the liquid membrane is obtained.

Annular flow liquid membrane separation and mass metering method

The invention relates to an equivalent calibration method for a conducting ring thin liquid film sensor. According to the calibration method, two conducting rings of the conducting ring thin liquid film sensor are equivalent to two planar strip electrodes; the length of each planar strip electrode is equal to the perimeter of the conductive ring; an adopted calibration device comprises a steppingmotor, a controller, a lead screw, an internal thread sleeve, a water tank, an excitation and acquisition module and an upper computer, the two planar long-strip electrodes are fixed to the bottom ofthe internal thread sleeve, internal threads of the internal thread sleeve are matched with external threads of the lead screw, the controller controls the stepping motor to drive the lead screw to move up and down, the distances between the two planar long-strip electrodes and the bottom of the water tank are changed, and therefore the thicknesses of liquid films on the surfaces of the two planarlong-strip electrodes are changed.

Equivalent calibration method for conducting ring thin liquid film sensor

The invention relates to a direct measurement system for an average thickness of an annular-flow local dynamic liquid film. The direct measurement system is used for measuring a liquid film of conductive liquid flowing in a pipe. A data measurement module includes a direct-current voltage-stabilizing power supply, an insertion-depth-adjustable contact probe sensor, and a precision resistor; and the insertion-depth-adjustable contact probe sensor includes a spiral micrometer 6, a double parallel contact probe 2, a connecting member 9, a fixed bracket 3, a telescopic bracket 7 and a spring 8.

Direct measurement system for average thickness of annular-flow local dynamic liquid film

The invention relates to an annular flow local dynamic liquid film average thickness direct measurement method, which is used for measuring the thickness of a liquid film of conductive liquid flowing in a pipeline. A data measurement module comprises a DC stabilized voltage supply, an insertion-depth-adjustable contact probe sensor and a precision resistor. The insertion-depth-adjustable contact probe sensor comprises a micrometer caliper 6, double parallel contact probes 2, a connecting piece 9, a fixation support 3, a telescopic support 7 and a spring 9. The direct measurement method comprises the following steps: when the conductive liquid submerges the lower ends of probes, the two probes are conducted and the whole circuit forms a loop, the current flows through the precision resistor, and the voltage at the two ends of the precision resistor is not zero; when no liquid exists between the two probes, the voltage at the two ends of the precision resistor is zero; and during continuous measurement, different duty ratios are obtained, and voltage signals corresponding to corresponding insertion depths are obtained; and finally, the average thickness of the local dynamic liquid film is calculated through the data processing module.

Annular flow local dynamic liquid film average thickness direct measurement method

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Direct measurement system for average thickness of annular-flow local dynamic liquid film

Annular flow local dynamic liquid film average thickness direct measurement method