Boiling heat transfer and critical heat flux in liquid films falling on vertically-mounted heat sources |
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| Affiliation: | 1. Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario L1H 7K4, Canada;2. Department of mechanical Engineering, KFUPM, Dhahran 31261, Saudi Arabia;1. CEI Campus Moncloa, UCM-UPM CSIC, Madrid 28040, Spain;2. Yebes Observatory, National Centre for Radioastronomical Technologies and Geospace Applications, Guadalajara 19080, Spain;3. Dpto. Física Aplicada III, Facultad de Ciencias Físicas, UCM, Madrid 28040, Spain;4. Institute of Physical and Information Technologies, CSIC, Madrid 28006, Spain;5. Fraunhofer Institute for Applied Solid State Physics IAF, Freiburg 79108, Germany |
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| Abstract: | Boiling heat transfer measurements were obtained for an inert fluorocarbon (FC-72) liquid film injected over a vertical heated wall. Flow visualization revealed that vigorous boiling prior to burnout ruptured the liquid continuum, causing most of the film to separate from the heated wall leaving a thin liquid subfilm which maintained contact with the wall. The critical heat flux (CHF) was accompanied by dryout of the subfilm after total separation of the liquid near the upstream edge of the heater. A higher CHF was achieved by increasing the film velocity or by utilizing a shorter heater. Experimental data correlated favorably with predictions of a CHF model based on the Helmholtz instability and subfilm dryout. |
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