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Study of droplets impact onto heated walls using Lattice Boltzmann Method

Grant number: 22/12257-5
Support Opportunities:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): December 01, 2022
Effective date (End): November 30, 2027
Field of knowledge:Engineering - Mechanical Engineering - Transport Phenomena
Principal Investigator:Luben Cabezas Gómez
Grantee:Vinicius Akyo Matsuda
Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Associated research grant:21/01897-0 - Experimental study of droplets impact onto heated walls using combined optical techniques: single droplets, multiple droplets and sprays, AP.JP

Abstract

Droplets and sprays impact onto heated walls have drawn attention from the engineering community because of its many applications, since this phenomenon allows more intense and efficient heat transfer, especially when considering cooling processes of components that operate at high-temperatures or under high heat fluxes. However, the transport phenomena involved in these processes are hard to quantify precisely, making difficult an optimized design of components and technologies that uses this kind of cooling process. The present research project seeks to develop numerical simulations to study the transport phenomena of single droplets (sessile and impacting) on both cooled(isothermal) and heated walls employing the Lattice-Boltzmann method (LBM). Specifically, the phase-field LBM model will be employed, which is based on the simulation of the interface using the Cahn-Hilliard or the Allen-Cahn equations, for the characterization of the cooling effects due to the interaction of a single droplet during its stationary (sessile) or dynamic (impact) contact with the respective solid surfaces. These studies will firstly focus on the simulation of hydrodynamic processes in cooled isothermal surfaces and then on the simulation of the heat transfer process in heated surfaces. The numerical results are to be compared with experimental data of good accuracy. Different hydrodynamic regimes related with a series of impact velocities and droplet diameters, and several heat transfer regimes associated with different values of heat flux are to be studied. (AU)

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