Abstract
This work presents and characterizes the existence of two different regimes in the spreading and break-up of liquid flat-fan sheets when discharging in low-density atmospheres. The motivation of the study is the improvement on the absorption phenomena of lithium bromide aqueous solution when discharging in a 600–1,500 Pa water vapor environment. This corresponds to the absorber conditions in current absorption closed-cycle cooling machines. Despite this, the dimensionless characterization obtained has universal validity. The conditions that define the change in the break-up regime, the dimensionless sheet break-up length and the break-up time are given as a function of the parameters involved. Digital particle tracking velocimetry (PTV) has been applied to measure the velocity field and additional visualization techniques have been used to further characterize the break-up process. The experiments verify the existence of critical gas-to-liquid density and viscosity ratios below which gas to liquid interaction becomes negligible. The article also offers expressions that define their values as a function of the other dimensionless parameters.
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Acknowledgments
Part of the instrumentation used in this work was available in the laboratory thanks to previous projects: CICYT AMB93-1430-CO2-01-CE, CICYT AMB99-0211, DGICYT PB95-0150-CO2-02, DPI -2003-01567 (CLIMABCAR), FIT-020100-2003-233 & FIT-020400-2004-68 (MINICOM fases I y II). Their contribution is gratefully appreciated. The last stages leading to this publication have been supported by the project ENE2006-13617 (TERMOPIV), from the Spanish Ministerio de Educación y Ciencia. The authors would like to thank the laboratory technicians Manuel Santos and Carlos Cobos for their dedication.
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Palacios, E., Nogueira, J., Rodríguez, P.A. et al. Experimental characterization of the spreading and break-up of liquid flat-fan sheets discharging in a low-density atmosphere and application to BrLi solutions. Exp Fluids 46, 331–342 (2009). https://doi.org/10.1007/s00348-008-0564-7
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DOI: https://doi.org/10.1007/s00348-008-0564-7