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3D numerical study on droplet-solid collisions in the Leidenfrost regime

Ge, Yang
http://rave.ohiolink.edu/etdc/view?acc_num=osu1124291953

Abstract Details

2005, Doctor of Philosophy, Ohio State University, Chemical Engineering.
A 3-dimensional numerical model is developed to simulate the process of collision between an evaporative droplet and a high-temperature solid object in this study. Such phenomena are of direct relevance to many engineering problems. The simulation model of this study is built upon advanced DNS (direct numerical simulation) techniques, coupled with a finite-volume algorithm in the fixed Eulerian grid. The 3D level-set method is employed to portray the droplet surface variation during its deformation. The immersed boundary method is applied to impose the solid-fluid boundary condition at the particle surface. To account for the micro-scale resistant effect induced by the film-boiling evaporation of the droplet, a vapor flow model is developed to calculate the pressure and velocity distributions along the vapor layer between the droplet and the solid. The temperature fields in all phases and the evaporation rate on the droplet surface are illustrated using a full-field heat transfer model. The comparisons of the simulation result with the experimental observation reveal the accuracy of the model, and the convergence is analyzed and verified by using different grid sizes in the computation. For saturated impact, the oscillation of the thickness of the vapor layer and the temperature at solid surface are calculated and compared favorably with the experimental results. The sub-cooled impact yields a thinner vapor layer and a higher heat transfer rate compared to the saturated impacts, and thus the kinetic discontinuity at the liquid-vapor and solid-vapor boundaries in the slip flow regime need to be considered. The effects of the droplet’s initial temperature are analyzed using the present model, and it shows that the droplet subcooling degree is significantly related to the thickness of the vapor layer and the heat flux at the solid surface. The collision process between an evaporative droplet and a high-temperature particle is investigated through numerical simulation and the experiment. The effects of the particle size and the collision velocity are examined numerically. Simulation model is further applied to study the oblique collision between the droplet and the particle. The effects of the obliquity on the outcome of the collision are analyzed.
Liang-Shih Fan (Advisor)
225 p.
Droplet; Collision; Simulation; Leidenfrost; Particle; Numerical modeling

Recommended Citations

Citations

  • Ge, Y. (2005). 3D numerical study on droplet-solid collisions in the Leidenfrost regime [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1124291953

    APA Style (7th edition)

  • Ge, Yang. 3D numerical study on droplet-solid collisions in the Leidenfrost regime. 2005. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1124291953.

    MLA Style (8th edition)

  • Ge, Yang. "3D numerical study on droplet-solid collisions in the Leidenfrost regime." Doctoral dissertation, Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1124291953

    Chicago Manual of Style (17th edition)

osu1124291953
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© 2005, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.