Numerical Analysis of Convective Mass Transfer during Multi-Droplet Impingement on a Structured Surface in the Presence of an Adhered Liquid Film-An Application to Spray Etching of PCBs

被引：0

作者：

Essl, Werner ^{[1
]}

Reiss, Georg ^{[1
]}

Raninger, Peter ^{[1
]}

Ecker, Werner ^{[1
]}

Koerbler, Nadine ^{[2
]}

Gerold, Eva ^{[2
]}

Antrekowitsch, Helmut ^{[2
]}

Klocek, Jolanta ^{[3
]}

Krivec, Thomas ^{[3
]}

机构：

[1] Mat Ctr Leoben Forsch GmbH, Roseggerstr 12, A-8700 Leoben, Austria

[2] Univ Leoben, Chair Nonferrous Met, Franz Josef Str 18, A-8700 Leoben, Austria

[3] Austria Technol & Syst Tech AT&S Aktiengesell, Fabriksgasse 13, A-8700 Leoben, Austria

来源：

FLUIDS | 2023年 / 8卷 / 06期

关键词：

Volume of Fluid; droplet impingement; structured surface; spray etching; convective mass transfer; SHAPE EVOLUTION; IMPACT; DYNAMICS;

D O I：

10.3390/fluids8060180

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Multi-droplet impingement is a fundamental aspect inherent to all kinds of technical spray processes which typically aim at enhancing the convective exchange of reagents or heat at the impinged surface. In this paper, the impingement of multiple droplets onto a structured surface is investigated by a comprehensive CFD model, which resolves the dynamics of the individual droplets and the film on a micro-scale level based on the Volume of Fluid (VOF) method. The considered surface topology includes cavities and is typical for protective masks used in the spray etching of Printed Circuit Boards (PCBs). The agitation of the liquid film in terms of the convective mass transfer rates across virtual horizontal evaluation planes is studied and the influence of film height and droplet impaction velocity is elaborated. Passive tracer tracking is employed to investigate the release and re-entrainment of fluid at the surface cavities. Two modes of mass exchange between the cavities and the main flow upon droplet impingement are identified, which are central inflow accompanied by lateral outflow (1) and lateral inflow with outflow at the opposing side (2). A statistical analysis of the allocation of tracer particles shows that high impaction velocities and low film heights correlate with an enhanced decay of tracer particles within the cavities. The susceptibility to re-entrainment is also reduced by high impaction velocities, whereas increased film heights are found to promote re-entrainment.

引用

页数：15