Phase Change Heat Transfer
Heat transfer involving phase change (liquid -> vapor or vapor -> liquid) has among the highest heat transfer rates due to the latent heat of phase change. In this research group we focus on phase change phenomena on micro- and nanostructured surfaces.We are particularly interested in understanding the droplet and lubricant dynamics on lubricant-infused surfaces (LIS), and how these dynamics influence heat transfer rates during dropwise condensation. Additionally, we are quantifying heat transfer rates during pool boiling on LIS.
Droplet Impact Dynamics
Droplet dynamics during impact on a solid surface are complex and very diverse. Using high speed optical and infrared (IR) imaging, we study the interplay of droplet dynamics and heat transfer during droplet impact on various surfaces. We are currently investigating the splashing behavior of droplets on superhydrophobic and bi-philic surfaces, and are developing a setup for 3D droplet impact imaging. We are furthermore interested in developing new techniques to manipulate droplet dynamics during and after impact.
Melt pool and particle dynamics during additive manufacturing of metals
Additive manufacturing (“3D printing”) offers many advantages over traditional manufacturing technologies, such as versatility, complex structures, rapid prototyping, and in-situ alloying and compositional gradients. Together with Dr. Katharine Flores (WashU), we are investigating the thermal-fluidic interactions during metallic 3D printing, and their effect on workpiece quality.