Local heat transfer from a hot plate to a water jet |
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Authors: | H?Robidou Email author" target="_blank">H?AuracherEmail author P?Gardin M?Lebouché L?Bogdani? |
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Institution: | 1.Berlin, Germany;2.Maizieres-les-Metz Cedex, France;3.Vandoeuvre Cedex, France;4.TU Berlin, Institut für Energietechnik, Sekr. KT1, Marchstra?e 18, D-10587 Berlin, Germany |
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Abstract: | Jet impingement boiling is very efficient in cooling of hot surfaces as a part of the impinging liquid evaporates. Because
of its importance to many cooling procedures, investigations on basic mechanisms of jet impingement boiling heat transfer
are needed. Until now, most of the experimental studies, carried out under steady-state conditions, used a heat flux controlled
system and were limited by the critical heat flux (CHF). The present study focuses on steady-state experiments along the entire
boiling curve for hot plate temperatures of up to 700°C. A test section has been built up simulating a hot plate. It is divided
into 8 independently heated modules of 10 mm length to enable local heat transfer measurements. By means of temperature controlled
systems for each module local steady-state experiments in the whole range between single phase heat transfer and film boiling
are possible. By solving the two dimensional inverse heat conduction problem, the local heat flux and the corresponding wall
temperature on the surface of each module can be computed. The measurements show important differences between boiling curves
measured at the stagnation line and those obtained in the parallel flow region. At the stagnation line, the transition boiling
regime is characterised by very high heat fluxes, extended to large wall superheats. Inversely, boiling curves in the parallel
flow region are very near to classical ones obtained for forced convection boiling. The analysis of temperature fluctuations
measured at a depth of 0.8 mm from the boiling surface enables some conclusions on the boiling mechanism in the different
boiling regimes. |
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Keywords: | Jet impingement boiling Boiling curves Local measurements High temperatures Temperature fluctuations |
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