液液两相湍流中的统计特性分析OA

Turbulent emulsions refer to dispersion systems formed by two immiscible liquid components(e.g.,oil and water)within turbulent flows.These systems are widely encountered in nature and have significant applications in the petroleum and chemical industries.Turbulent flows contain many strongly coupled degrees of freedom,and there are multiscale coupling effects between the two-phase interface and turbulent flow,making turbulent emulsions more complex compared to single-phase turbulence.In this paper,three-dimensional direct numerical simulations of turbulent emulsions within the Taylor-Couette system are carried out using the interface-resolved volume-of-fluid method to investigate the effect of dispersed droplets with different fluid properties on the turbulent characteristics.The study reveals that when both phases have the same density and viscosity,dispersed droplets enhance the angular momentum transport capacity of turbulent fluctuations and modulate the distribution of these fluctuations.Specifically,this manifests as enhanced turbulent fluctuations near the inner and outer cylinders while weakening those far from them.A reduction in dispersed-phase density and a further reduction in dispersed-phase viscosity both tend to weaken the angular momentum transport capacity and intensity of turbulent fluctuations.For the Taylor vortex,the presence of dispersed droplets consistently tends to weaken both its intensity and angular momentum transport capability.The related findings contribute to a deeper understanding of the effect of dispersed phase in turbulent emulsions.