Experimental investigation into the impact of density wave oscillations on flow boiling system dynamic behavior and stability
| Autor: | Lucas E. O'Neill, Aubrey Lokey, Mohammad M. Hasan, Henry K. Nahra, Nancy R. Hall, Jeffery R. Mackey, R. Balasubramaniam, Issam Mudawar |
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| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Pressure drop Materials science Thermodynamic equilibrium Mechanical Engineering Flow (psychology) 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Article 010305 fluids & plasmas law.invention Density wave theory Subcooling Physics::Fluid Dynamics Pressure measurement Critical frequency law 0103 physical sciences 0210 nano-technology Condenser (heat transfer) |
| Zdroj: | International journal of heat and mass transfer. 120 |
| ISSN: | 0017-9310 |
| Popis: | In order to better understand and quantify the effect of instabilities in systems utilizing flow boiling heat transfer, the present study explores dynamic results for pressure drop, mass velocity, thermodynamic equilibrium quality, and heated wall temperature to ascertain and analyze the dominant modes in which they oscillate. Flow boiling experiments are conducted for a range of mass velocities with both subcooled and saturated inlet conditions in vertical upflow, vertical downflow, and horizontal flow orientations. High frequency pressure measurements are used to investigate the influence of individual flow loop components (flow boiling module, pump, pre-heater, condenser, etc.) on dynamic behavior of the fluid, with fast Fourier transforms of the same used to provide critical frequency domain information. Conclusions from this analysis are used to isolate instabilities present within the system due to physical interplay between thermodynamic and hydrodynamic effects. Parametric analysis is undertaken to better understand the conditions under which these instabilities form and their impact on system performance. Several prior stability maps are presented, with new stability maps provided to better address contextual trends discovered in the present study. |
| Databáze: | OpenAIRE |
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