Open Access

ARTICLE

MULTICOMPONENT GAS-PARTICLE FLOW AND HEAT/MASS TRANSFER INDUCED BY A LOCALIZED LASER IRRADIATION ON A URETHANE-COATED STAINLESS STEEL SUBSTRATE

Nazia Afrin^a, Yijin Mao^a, Yuwen Zhang^a,*, J. K. Chen^a, Robin Ritter^b, Alan Lampson^b, Jonathan Stohs^c

a Department of Mechanical and Aerospace Engineering, University of Missouri, Columbia, MO 65201, USA
b Tau Technologies, LLC, 1601 Randolph Rd., SE, 110s, Albuquerque, NM 87106, USA
c Air Force Research Lab-RDLT, 3550 Aberdeen Ave SE, Bldg 760, Kirtland AFB, NM 87117, USA

* Corresponding Author: Email:

Frontiers in Heat and Mass Transfer 2016, 7, 1-8. https://doi.org/10.5098/hmt.7.7

Abstract

A three-dimensional numerical simulation is conducted for a complex process in a laser-material system, which involves heat and mass transfer in a compressible gaseous phase and chemical reaction during laser irradiation on a urethane paint coated on a stainless steel substrate. A finite volume method (FVM) with a co-located grid mesh that discretizes the entire computational domain is employed to simulate the heating process. The results show that when the top surface of the paint reaches a threshold temperature of 560 K, the polyurethane starts to decompose through chemical reaction. As a result, combustion products CO₂, H₂O and NO₂ are produced and chromium (III) oxide, which serves as pigment in the paint, is ejected as solid parcels from the paint into the gaseous domain. Variations of temperature, density and velocity at the center of the laser irradiation spot, and the concentrations of reaction reactant/products in the gaseous phase are presented and discussed, by comparing six scenarios with different laser powers ranging from 2.5 kW to 15 kW with an increment of 2.5 kW.

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Keywords

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