Development of Microscale Visualization Techniques


A review on advanced flow visualization techniques is presented particularly for applications to microscale heat and mass transport measurements. Challenges, development and applications of microscale visualization techniques are discussed for the study of heating/evaporating thin films, gas bubble advancement in a microchannel, thermophoretic behavior near the solid surface, and microheater fabrications, mainly conducted at the Microscale Fluidics and Heat Transport Laboratory of Texas A&M University. The presented topics include: 1. Fizeau interferometry for thin film thickness measurements. 2. Total Internal Reflection Fluorescence Microscopy (TIRFM) for flow field measurements with 100-nm depth-of-field. 3. Molecular Tagging Fluorescence Velocimetry (MTFV) using 10-nm caged seeding molecules. 4. Ratiometric Laser Induced Fluorescence (LIF) for micro-resolution thermometry. 5. Confocal Laser Scanning Microscopy (CLSM) for optical sectioning with 1.0-μm depthwise resolution. 6. Multi-layer fabrications of microheater arrays with feedback circuit control. Each of these techniques is discussed in three-fold: (1) its operating principle and operation, (2) its application and measurement results, and (3) its future challenges.


Mechanical and Aerospace Engineering

Keywords and Phrases

Eating/Evaporating Thin Films; Flow Visualization Techniques; Microchannel; Microscale Heat and Mass Transport

Document Type

Article - Journal

Document Version


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