Xiaoyu Tang

• Doctor of Philosophy
• Assistant Professor at Northeastern University

Droplet impact on surfaces is ubiquitous in many natural and industrial processes. While the impact dynamics of droplets composed of simple fluids have been studied extensively, droplets containing particles are less explored, but are more application relevant. The non-Newtonian behavior of particle suspension introduces new physics affecting the i...

The temperature dependence of the diffusiophoretic mobility (DDP) is investigated experimentally and compared with theoretical predictions. These systematic measurements were made possible by a new microfluidic approach that enables truly steady state gradients to be imposed, and direct and repeatable measurements of diffusiophoretic migration to b...

The delivery of small particles into porous environments remains highly challenging because of the low permeability to the fluids that carry these colloids. Even more challenging is that the specific location of targets in the porous environment usually is not known and cannot be determined from the outside. Here, we demonstrate a two-step strategy...

We herein report an experimental study to explore the effects of impact inertia, film thickness and viscosity on the dynamics of shape deformation of a drop impacting a liquid film. We have identified that the spreading dynamics shows a weak dependence on impact inertia, but strongly depends on the film thickness. For a thick film, the liquid surfa...

We herein report an experimental study on the morphological evolution of a vortex ring formed inside a liquid pool after it is impacted and penetrated by a coalescing drop of the same liquid. The dynamics of the penetrating vortex ring along with the deformation of the pool surface has been captured using simultaneous high-speed laser induced fluor...

The transition between merging and bouncing outcomes for a drop impacting on a liquid film is critically controlled by the resistance from the microscopic interfacial gas layer trapped between the interacting and deformable drop and film surfaces. Using high-speed imaging and color interferometry, we have quantified and analyzed the gas layer dynam...

When a drop impacts on a liquid surface, it can either bounce back or merge with the surface. The outcome affects many industrial processes in that merging is preferred in spray coating to generate a uniform layer and bouncing is desired in IC engines to prevent accumulation of the fuel drop on the wall. Thus, a good understanding of how to control...

Drop impacting a liquid film with finite thickness is omnipresent in nature and plays a critical role in numerous industrial processes. The impact can result in either bouncing or merging, which are mainly controlled by the impact inertia of the drop and film thickness. Although it is known that impacts with inertia beyond a critical value on a thi...

Drop impacting on a liquid film with a finite thickness is omnipresent in nature and plays a critical role in numerous industrial processes. The impact can result in either bouncing or merging, which is mainly controlled by the impact inertia of the drop and film thickness. Although it is known that impact with inertia beyond a critical value on a...

It is well-known that carbonation is characterized by a rapid initial rate followed by an abrupt transition to a very slow reaction rate. The slow period is believed to be controlled by the diffusion of reacting species throughout the product layer of CaCO3. The thickness of the carbonate layer formed on the free surfaces of CaO is a critical param...

The direct sulfation of single-crystal CaCO3 with SO2 and O2 at high CO2 concentrations was studied using Thermo-gravimetric Analysis (TGA), an Atomic Force Microscope (AFM), a Scanning Electron Microscope (SEM) and Energy-Dispersive Spectroscopy (EDS). Nucleation and crystal grain growth of the solid product were observed on the surface of the sul...

The nucleation, growth and arrangement of MgSO4 product layers during the reaction of single-crystal MgO with SO2 and O2 were investigated via atomic force microscopy (AFM). The morphology of the single-crystal MgO surface after reacting with SO2 and O2 consisted of three-dimensional cone-shaped MgSO4 product islands. Most of the islands appeared a...