An experimental and numerical study into turbulent condensing steam jets in air |
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Authors: | S Oerlemans R Badie M E H Van Dongen |
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Institution: | (1) Faculty of Applied Physics Eindhoven University of Technology Eindhoven, The Netherlands e-mail: stefan@nlr.nl, NL;(2) Philips Research Laboratories Eindhoven, The Netherlands, NL;(3) Faculty of Applied Physics Eindhoven University of Technology, PO Box 513 5600 MB Eindhoven, The Netherlands, NL |
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Abstract: | Temperatures, velocities, and droplet sizes are measured in turbulent condensing steam jets produced by a facial sauna, for
varying nozzle diameters and varying initial velocities (Re=3,600–9,200). The release of latent heat due to droplet condensation causes the temperature in the two-phase jet to be significantly
higher than in a single-phase jet. At some distance from the nozzle, droplets reach a maximum size and start to evaporate
again, which results in a change in sign of latent heat release. The distance of maximum size is determined from droplet size
measurements. The experimental results are compared with semi-analytical expressions and with a fully coupled numerical model
of the turbulent condensing steam jet. The increase in centreline temperature due to droplet condensation is successfully
predicted.
Received: 5 April 2000 / Accepted: 15 November 2000 |
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