The effect of particle characteristics on entrainment, capture, and expulsion during particle-laden
Abstract
This project will investigate the transfer of particulates from the atmosphere to the ocean, where raindrops are the primary vector., It has been shown that air pollution greatly decreases after rainstorms, and therefore it is hypothesized that pollutants are carri,ed by raindrops to the earths surface and the oceans. Pollutants in the form of particulates can alter the properties of the marine, environment, including the surface micro-layer (SML), rich in micro-organisms. Changes to this layer can have a profound impact on, air-sea fluxes. Furthermore, changes to the ocean and the SML are generally detrimental to performance of Navy systems. For example,, air-borne particulate matter decreases visibility and electromagnetic propagation, negatively affecting sensors, weapons and commu,nications performance.--As such, this project aims to study the dynamics of impact for a range of impact conditions and particulate, characteristics to determine the end distribution of the particles when they impact onto deep pools of water. The technical objecti,ves can thus be stated as follows:1. Particle-laden drops. Describe the destination of pollution particles carried inside of rain dr,oplets when the droplets impact on the ocean surface.2. Particle-coated drops. Describe the destination of pollution particles carri,ed on the surface of rain droplets when the droplets impact on the ocean surface.3. Particle-coated surface. Describe the destinatio,n of pollution particles resting on the ocean surface when a rain droplet impacts in the vicinity.4. Summarize. Quantify our results, in the parameter space. T he technical approach will consist of a combination of experiments and numerical simulations.-On the expe,rimental side, both high-speed visualizations, as well as droplet sizing (for splash-induced sprays) will be conducted. To complemen,t the experiments, we will develop computational fluid dynamics (CFD) simulations to reveal more details about the flow physics that, cannot be obtained experimentally, such as the motion of microscopic particles. The expected outcome of this project is an overall, better understanding of the role of particulates in raindrop impact events, and the end distribution of particles throughout the oc,eans SML. The knowledge garnered through this research will be disseminated via peer-reviewed scientific publications and technical, conferences.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 01, 2022
- Source ID
- N000142212086
Entities
People
- Jeremy Marston
Organizations
- Office of Naval Research
- Texas Tech University System
- United States Navy