Depressurization experiments were conducted with C6F14 for superheats between 5 °C and 90 °C in order to determine how the drop characteristics evolve with the thermodynamic disequilibrium. High-speed imaging indicates that flashing is predominant and leads to very dense sprays. Phase Doppler Interferometer (PDI) was adapted to these optically thick conditions and its ability to provide unbiased velocity and size distributions was carefully checked (even though the flux was underestimated). Experiments show that, for initial superheats above 40 °C, the mean drop velocity linearly increases with the initial superheat while the mean drop diameter remains nearly constant. Such behaviors, not reported in the literature, are tentatively related with a front boiling process in which the drop velocity is driven by the vapor velocity while the drop size is controlled by bubbles exploding at the front. In addition, phase detection optical probes used in combination with PDI data provided number density flux measurements. Global vaporization rates deduced from these local data happen to be fairly consistent with alternate techniques, and the vapor flux exhibits a somewhat weak increase with the superheat.
Clélia Desnous 1; Alain Cartellier 1; Nicolas Meyers 2
@article{CRMECA_2013__341_1-2_88_0, author = {Cl\'elia Desnous and Alain Cartellier and Nicolas Meyers}, title = {Experimental investigation of explosive vaporization of {C\protect\textsubscript{6}F\protect\textsubscript{14}}}, journal = {Comptes Rendus. M\'ecanique}, pages = {88--99}, publisher = {Elsevier}, volume = {341}, number = {1-2}, year = {2013}, doi = {10.1016/j.crme.2012.10.008}, language = {en}, }
TY - JOUR AU - Clélia Desnous AU - Alain Cartellier AU - Nicolas Meyers TI - Experimental investigation of explosive vaporization of C6F14 JO - Comptes Rendus. Mécanique PY - 2013 SP - 88 EP - 99 VL - 341 IS - 1-2 PB - Elsevier DO - 10.1016/j.crme.2012.10.008 LA - en ID - CRMECA_2013__341_1-2_88_0 ER -
Clélia Desnous; Alain Cartellier; Nicolas Meyers. Experimental investigation of explosive vaporization of C6F14. Comptes Rendus. Mécanique, Combustion, spray and flow dynamics for aerospace propulsion, Volume 341 (2013) no. 1-2, pp. 88-99. doi : 10.1016/j.crme.2012.10.008. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2012.10.008/
[1] Sprays formed by flashing liquid jets, AIChE J., Volume 8 (1962), pp. 149-153
[2] Experimental determination of the droplet size and velocity distributions at the exit of the bottom discharge pipe of a liquefied propane storage tank during a sudden blowdown, J. Loss Prev. Process Ind., Volume 9 (1996), pp. 413-425
[3] D. Yildiz, P. Rambaud, J. Van Beeck, J.M. Buchlin, Evolution of the spray characteristics in superheated liquid atomization in function of initial flow conditions, in: ICLASS, Kyoto, Japan, August 27–September 1, 2006.
[4] Spray velocity and drop size measurements in flashing conditions, At. Sprays, Volume 19 (2009), pp. 103-133
[5] A rigorous procedure for design and response determination of phase Doppler systems, Lisbon, Portugal, 11–14 July (1994)
[6] Explosive vaporization of superheated liquids by boiling fronts, Int. J. Multiphase Flow, Volume 27 (2001), pp. 1487-1516
[7] Jet formation in gas bubbles bursting at a free surface, Phys. Fluids, Volume 14 (2002), pp. 3000-3008
[8] Characterization of phase detection optical probes for the measurement of the dispersed phase parameters in sprays, Int. J. Multiphase Flow, Volume 30 (2004), pp. 615-648
Cited by Sources:
Comments - Policy