Photographic study of bubble departure diameter in saturated pool boiling to electrolyte solutions
Bubble departure diameters during saturated pool boiling to pure water and three different electrolyte solutions including NaCl, KNO3, and KCl aqueous solutions are experimentally measured. Variable heat fluxes up to 90 kW/m2 and different salt concentrations from 10.6 to 69.6 kg/m3 are app...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Association of the Chemical Engineers of Serbia
2014-01-01
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| Series: | Chemical Industry and Chemical Engineering Quarterly |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1451-9372/2014/1451-93721200120P.pdf |
| Summary: | Bubble departure diameters during saturated pool boiling to pure water and
three different electrolyte solutions including NaCl, KNO3, and KCl aqueous
solutions are experimentally measured. Variable heat fluxes up to 90 kW/m2
and different salt concentrations from 10.6 to 69.6 kg/m3 are applied in
order to investigate their effects on the bubble size during pool boiling
around the horizontal rod heater. Visual observations demonstrated that
larger vapor bubbles generate on the heat transfer surface at higher salt
concentrations and lower heat fluxes in all of the solutions tested while in
distilled water bubbles become slightly larger with increasing heat flux.
Furthermore, the effects of different important physical properties like
surface tension, viscosity, and density of the solutions on the bubble
departure diameter are also discussed. NaCl solutions have surface tension
higher than the other electrolyte solutions. Furthermore, the addition of
NaCl to distilled water slightly increases the viscosity of the solution
whereas other salts have no measurable effect on the viscosity. Therefore, it
is expected that larger bubbles to be appeared on the heat transfer surface
during the boiling of NaCl solutions which is in agreement with the
experimental results. |
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| ISSN: | 1451-9372 2217-7434 |