Jeffrey Donald Jones

Mass transfer of an impinging jet confined between parallel plates

An understanding of the mass transfer behavior of an impinging jet can be usefully applied to wet chemical processes such as water rinsing, photoresist development, and metal etching or plating. Theoretical and experimental methods were used to study the mass transfer characteristics of an axisymmetric impinging jet confined between two parallel plates. Such a configuration was used because of its potential applicability to the fabrication of printed wiring boards. The CFD (computational fluid dynamics) method was used to model fluid flow and mass transfer. An electrochemical probe based on the ferro-ferricyanide system was used to experimentally determine the mass transfer coefficients and to evaluate the applicability of the theoretical methods used. An etching method was used to characterize the mass transfer rates in a typical cupric chloride etching solution. A new observation of the effect of jet instability on the etching rate in the central impingement zone is discussed.

Fluid head-source reduction process technology

The fluid head is an exciting new technology developed at IBM Endicott. It is based on the fluid bearing principle, where small volumes of high speed fluid, hold and support and process a panel. This process is confined very close to the product and is able to deliver controlled amounts of fluids resulting in: less water usage; emission reduction; better chemical containment; reduced atomization; less hazardous waste; and less energy consumption. In this paper, comparisons of equipment utilizing the fluid head in rinsing, and drying devices are compared with conventional dip and spray processes. Parameters of ionic contamination, debris removal, electrical usage, as well as water usage and reduction in floor space are compared.<<ETX>>