Device and method for measuring liquid film thickness in falling film microchannel and hydrodynamic behavior by utilizing stereo microscope
A technology of stereo microscope and liquid film thickness, which is applied in measurement devices, instruments, etc., can solve the problems of limiting the scope of application of measurement technology, difficulty in tracking particles, and high price, and achieves the reduction of experimental cost, simple equipment and low cost. Effect
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Embodiment 1
[0021] Observe the wetting process of the liquid relative to the falling film channel:
[0022] Such as figure 1 As shown, the falling film microreactor was fixed on a stereomicroscope (Smartzoom 5, Carl Zeiss , Germany) on the stage, adjust the microscope lens to the horizontal state, so that the collection light path vertically irradiates the falling film microchannel. ST, Beijing Spacecraft , China), set the liquid phase feed flow Q L = 15 ml / h, feed the test system, the falling film medium used is deionized water, and the refractive index at room temperature is 1.333; turn on the microscope, and record the liquid phase flowing out from the liquid distributor to the wetting process of the entire channel. The results show that: the liquid phase first wets the falling film channel and the side walls on both sides, and then the liquid phase evaporates rapidly at the side walls, and the liquid phase flows completely in the channel, as shown in Fig. figure 2 process ...
Embodiment 2
[0024] Observe the flow pattern of the liquid phase in a falling film microchannel:
[0025] Such as figure 1 As shown, the falling film microreactor was fixed on a stereomicroscope (Smartzoom 5, Carl Zeiss , Germany) on the stage, adjust the microscope lens to the horizontal state, so that the collection light path vertically irradiates the falling film microchannel. ST, Beijing Spacecraft , China), set the liquid phase feed flow Q L = 10 ml / h, feed the test system, the falling film medium used is absolute ethanol, and the refractive index at room temperature is 1.362; after the liquid phase reaches a stable state, turn on the microscope to observe the film formation of the liquid phase in the microchannel ;Change feed flow Q L = 2 ml / h, observe the integrity of the liquid film and the flow pattern of the liquid phase in the microchannel under different feed flow rates. The results show that when the flow rate is large, the liquid phase completely wets the chann...
Embodiment 3
[0027] Measuring liquid phase film thickness
[0028] Such as figure 1 As shown, the falling film microreactor was fixed on a stereomicroscope (Smartzoom 5, Carl Zeiss , Germany) on the stage, adjust the microscope lens to a horizontal state, so that the collection light path vertically illuminates the falling film microchannel, the material of the falling film microchannel used is 316L stainless steel, the channel depth is 200 μm, and the width is 1200 μm; turn on the microscope and scan the blank channel Imaging, recording the two-dimensional coordinate information of the channel, and the channel depth is recorded as , as the baseline for liquid film thickness measurement; turn on the syringe pump (DB-80-ST, Beijing Spacecrafts , China), set the liquid phase feed flow Q L= 15 ml / h, feed the test system, the falling film medium used is deionized water, and the refractive index at room temperature is 1.333; after the liquid phase reaches a stable state, the microscope ...
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