Melt-front propagation and velocity profiles in packed beds of phase-change materials measured by magnetic resonance imaging
| Autor: | Joseph D. Seymour, Dinal Perera, Ryan Anderson, James E. Maneval, Matthew E. Skuntz |
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| Rok vydání: | 2018 |
| Předmět: |
Packed bed
Materials science 020209 energy Applied Mathematics General Chemical Engineering Flow (psychology) 02 engineering and technology General Chemistry Mechanics 021001 nanoscience & nanotechnology Signal Phase-change material Industrial and Manufacturing Engineering Phase (matter) Heat transfer 0202 electrical engineering electronic engineering information engineering Fluid dynamics Particle 0210 nano-technology |
| Zdroj: | Chemical Engineering Science. 190:164-172 |
| ISSN: | 0009-2509 |
| Popis: | Fluid flow and heat transfer characteristics in packed beds are of importance in many fields of study. However, experimental characterization and model validation of the numerical methods used to study packed beds is difficult. Utilizing nuclear magnetic resonance (NMR), we present a novel approach to track the melt front (and thus melt temperature) in a non-isothermal packed bed. The approach tracks the melt front through packed beds of wax encapsulated phase change material (PCM) by taking advantage of the change in T 2 associated with phase change. Additionally, velocity maps of the flow in the pore space of the same packed bed sample are obtained. The approach uses the 1 H signal from the PCM packing and the 19 F signal from the flowing fluid to allow monitoring of both particle bed structure/phase and flow velocities in the same sample with the use of a dual tune coil. Together, this information can be used to probe the heat transfer characteristics of packed beds experimentally. |
| Databáze: | OpenAIRE |
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