Experimental and computational investigation on two-phase flow and heat transfer of highly subcooled flow boiling in vertical upflow
| Autor: | Seunghyun Lee, Lucas E. O'Neill, Issam Mudawar, Jeongmin Lee |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Materials science 020209 energy Mechanical Engineering 02 engineering and technology Heat transfer coefficient Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Physics::Fluid Dynamics Subcooling Flow velocity Boiling Heat transfer 0202 electrical engineering electronic engineering information engineering Fluid dynamics Volume of fluid method Two-phase flow 0210 nano-technology |
| Zdroj: | International Journal of Heat and Mass Transfer. 136:1199-1216 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/j.ijheatmasstransfer.2019.03.046 |
| Popis: | This study explores subcooled nucleate flow boiling of FC-72 in a rectangular channel having two opposite heating walls at different mass velocities and wall heat fluxes ranging from 42% to 45% of CHF. Experiments are performed in which constant and equal heat fluxes are supplied from the heating walls, with local wall temperatures measured at several axial locations and used to determine axial variations of local heat transfer coefficient. Additionally, detailed information on flow pattern and phase distribution is captured by high-speed video through the channel’s transparent sidewalls. Experimental values for key fluid flow and thermal parameters are compared to predictions of 2D computational simulations using ANSYS FLUENT. The computations are based on the multi-phase volume of fluid (VOF) model combined with an appropriate phase change model, and account for conjugate heat transfer along the heating walls. Computed transverse profiles and stream-wise variations of void fraction, flow velocity, and wall temperature are examined. The computed results show reasonable agreement with experimentally captured interfacial behavior as well as heat transfer parameters. Computed cross-sectional temperature profiles for the mixture show non-equilibrium subcooled boiling with steep temperature gradients near the heating walls and low temperature liquid in the core region. This study is concluded by exploring limitations of the 2D model used. |
| Databáze: | OpenAIRE |
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