- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
3D Reconstruction of Slug Flow in Mini-Channels with a Simple and Low-Cost Optical Sensor
摘要： The present work provides a new approach for 3D image reconstruction of gas-liquid two-phase flow (GLF) in mini-channels based on a new optical sensor. The sensor consists of a vertical and a horizontal photodiode array. Firstly, with the optical signals obtained by the vertical array, a measurement model developed by Support Vector Regression (SVR) was used to determine the cross-sectional information. The determined information was further used to reconstruct cross-sectional 2D images. Then, the gas velocity was calculated according to the signals obtained by the horizontal array, and the spatial interval of the 2D images was determined. Finally, 3D images were reconstructed by piling up the 2D images. In this work, the cross-sectional gas-liquid interface was considered as circular, and high-speed visualization was utilized to provide the reference values. The image deformation caused by channel wall was also considered. Experiments of slug flow in a channel with an inner diameter of 4.0 mm were carried out. The results verify the feasibility of the proposed 3D reconstruction method. The proposed method has the advantages of simple construct, low cost, and easily multipliable. The reconstructed 3D images can provide detailed and undistorted information of flow structure, which could further improve the measurement accuracy of other important parameters of gas-liquid two-phase flow, such as void fraction, pressure drop, and flow pattern.
关键词： Support Vector Machine,3D image reconstruction,gas-liquid two-phase flow,mini-channels,optical sensor,slug flow
更新于2025-09-11 14:15:04
-
Synthesis of silver nanoparticles by atmospheric-pressure pulsed discharge plasma in a slug flow system
摘要： Application of nonequilibrium atmospheric-pressure plasma has been proven as a medium for silver particle formation in slug flow reactor systems. Argon gas was introduced in the slug flow reactor system in the gas phase. In the liquid phase, silver nitrate (AgNO3) with and without the addition of starch was dissolved in distilled water. The flow rates of the liquid and gas phases were 1.5 and 0.15 ml min?1, respectively. A yellow-colored solution product was obtained when the feed solution containing starch was fed. The optical emission spectrum showed that silver atoms were detected clearly at 328 nm. The ultraviolet–visible spectroscopy analysis showed that the solution products seemed to absorb light between 380 and 440 nm, corresponding to silver nanoparticle generation. Transmission electron microscopy revealed that the monodispersed silver nanoparticles were formed in a spherical morphology with diameter less than 10 nm on average. ? 2018 The Japan Society of Applied Physics
关键词： atmospheric-pressure pulsed discharge plasma,starch,silver nitrate,silver nanoparticles,slug flow system
更新于2025-09-10 09:29:36