Binary collision of CMAS droplets—Part II: Unequal-sized droplets
Source abstract
Abstract
The analysis presented in Part I of this study on the binary collision of equal molten calcium–magnesium–alumino–silicate (CMAS) droplets is extended to investigate the flow and interfacial dynamics of unequal CMAS droplet collision. Numerical investigations of head-on, off-center, and grazing collisions of two CMAS droplets of size 1 and 2 mm are conducted at pressure and temperature of 20 atm and 1548 K, respectively, that are representative of a gas-turbine combustor. At these conditions, the physical properties of CMAS are density, ρCMAS= 2690 kg/m3, surface tension between CMAS/air, σCMAS= 0.40 N/m, and viscosity, μCMAS= 11.0 N-s/m2. The primary difference between the CMAS and a fictitious fluid with viscosity 1/10 of CMAS was higher deformation for the lower viscosity case, leading to stretching and subsequent breakup of the liquid structure. These mechanisms are supported by the time evolution of surface, kinetic, and viscous dissipation energies.
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Research context
OpenAlex topics: Fluid Dynamics and Heat Transfer · Laser-induced spectroscopy and plasma · Particle Dynamics in Fluid Flows
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