posted on 2018-01-05, 00:00authored byUddalok Sen, Souvick Chatterjee, Pallab Sinha Mahapatra, Ranjan Ganguly, Richard Dodge, Lisha Yu, Constantine M. Megaridis
Liquid
jet impingement on porous materials is particularly important in many
applications of heat transfer, filtration, or in incontinence products.
Generally, it is desired that the liquid not penetrate the substrate
at or near the point of jet impact, but rather be distributed over
a wider area before reaching the back side. A facile wettability-patterning
technique is presented, whereby a water jet impinging orthogonally
on a wettability-patterned nonwoven substrate is distributed on the
top surface and through the porous matrix, and ultimately dispensed
from prespecified points underneath the sample. A systematic approach
is adopted to identify the optimum design that allows for a uniform
distribution of the liquid on horizontally mounted substrates of ∼50
cm2 area, with minimal or no spilling over the sample edges
at jet flow rates exceeding 1 L/min. The effect of the location of
jet impingement on liquid distribution is also studied, and the design
is observed to perform well even under offset jet impact conditions.