Study on the Evolution Process of Bubble Induced Microfluidic Jet Based on Synchrotron Radiation High Spatiotemporal Resolution X-ray Imaging Technology

气泡及其空化过程是气泡动力学中的重要研究课题。传统的研究方法依靠可见光高速成像技术对这一过程进行实时观测，但存在空间分辨率和信噪比低、成像对比度弱等问题。本文基于上海光源快速X射线成像线站（BL16U2）的高通量白光快速X射线成像探测器，构建了用于水下气泡动力学实时观测的高时空分辨率X射线成像实验系统。还进行了水下气泡动力学的实验研究。实验结果表明，实验系统的时间分辨率达到 25 μ s，探测器的有效像素尺寸为 4 μ m，实时清晰地观察到了气泡在水中生长、崩溃和射流产生的完整而微妙的演变过程。此外，基于获得的实时动态图像结果，采用运动对比成像方法对气泡表面产生的毛细管波进行表征和分析，得到毛细管波的传播路径和波长。本文建立的高时空分辨率 X 射线成像实验方法用于水下气泡动力学的实时观测，为更深入地了解气泡诱导微射流的演化过程提供了新的研究工具。

Bubbles and their cavitation process are important research topics in bubble dynamics. Traditional research methods rely on visible light high-speed imaging technology to perform real-time observation of this process, but suffer from issues such as low spatial resolution and signal-to-noise ratio (SNR), as well as poor imaging contrast. This paper constructs a high spatiotemporal resolution X-ray imaging experimental system for real-time observation of underwater bubble dynamics, based on the high-throughput white-light fast X-ray imaging detector at the Fast X-ray Imaging Beamline (BL16U2) of the Shanghai Synchrotron Radiation Facility (SSRF). Experimental studies on underwater bubble dynamics were also conducted. Experimental results show that the temporal resolution of the experimental system reaches 25 μs, and the effective pixel size of the detector is 4 μm. The complete and subtle evolution process of bubbles in water, including growth, collapse and jet generation, was clearly observed in real time. In addition, based on the obtained real-time dynamic image results, the capillary waves generated on the bubble surface were characterized and analyzed using the motion contrast imaging method, and the propagation path and wavelength of the capillary waves were obtained. The high spatiotemporal resolution X-ray imaging experimental method established in this paper is used for real-time observation of underwater bubble dynamics, providing a new research tool for a deeper understanding of the evolution process of bubble-induced microjets.

搜集汇总

背景与挑战

背景概述

该数据集基于同步辐射高时空分辨率X射线成像技术，研究气泡诱导微流体射流的演化过程。通过构建时间分辨率达25μs、像素尺寸4μm的实验系统，实时观测了气泡在水中生长、崩溃和射流的完整动态，并分析了毛细管波的传播特性。这为气泡动力学提供了新的高精度观测工具，克服了传统成像方法的局限性。