Submicron thermal imaging of a nucleate boiling process using fluorescence microscopy
| Autor: | Ivan Sedmak, Rok Podlipec, Iztok Urbančič, Iztok Golobič, Janez Štrancar, Michel Mortier |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Bubble Nucleation 02 engineering and technology 01 natural sciences Industrial and Manufacturing Engineering 010305 fluids & plasmas Physics::Fluid Dynamics Optics Boiling 0103 physical sciences Thermal Electrical and Electronic Engineering Image resolution Civil and Structural Engineering business.industry Mechanical Engineering Building and Construction 021001 nanoscience & nanotechnology Pollution Characterization (materials science) General Energy Transient (oscillation) 0210 nano-technology business Nucleate boiling |
| Zdroj: | Energy. 109:436-445 |
| ISSN: | 0360-5442 |
| DOI: | 10.1016/j.energy.2016.04.121 |
| Popis: | The submicron characterization of transient heat-transfer processes at solid–liquid interfaces is of great importance in many areas of science and engineering. This paper reports on a technique that allows for the transient thermal imaging of the temperature field underneath a growing bubble during nucleate boiling with submicron spatial resolution. The boiling experiments were performed on a temperature-sensitive, erbium-doped, heavy-metal glass, Er:ZBLALiP, used as a robust sensing material for the non-invasive, transient temperature measurements. These measurements were made by analyzing the intensity variations of the fluorescence emission. The thermal imaging of an active nucleation site was performed by utilizing high-resolution, fluorescence microscopy, which enabled a maximum spatial resolution of 370 nm/pixel. The high-speed acquisition above 400 fps ensured sampling of individual bubble-nucleation events. Our transient measurements clearly revealed temperature variations underneath the growing bubble, as well as a measurable bubble-departure frequency under saturated conditions. These encouraging results suggest the need for a systematic use of the corresponding fluorescence technique on enhanced boiling surfaces in order to define the local heat-transfer characteristics and to gain a better understanding of the underlying physical processes. |
| Databáze: | OpenAIRE |
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