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 Parents who have faced the problem of leaking diapers know all about
the issues of absorbency. No doubt babies do too, although their opinions
on the matter are subject to conjecture. Nonetheless, the science of the
flow of fluids in diapers is very complex, involving material porosity,
weave, and liquid viscosities. Clearly, absorbency is critical to a good
diaper design. Male and female anatomical differences necessitate two
separate designs for diapers, although very similar flow problems are
being solved. CFD can help in diaper research and manufacture through
the simulation of various woven and non-woven fiber configurations inside
diapers and the effects of various layer thicknesses and absorbencies.
The CFD approach yields valuable point-by-point data on moisture content
distribution in the diaper for any permutation of diaper design. Moreover,
detailed knowledge of the flow past and through fiber weaves and in channels
can be obtained. The same approach can be used for sanitary napkins and
other absorbent products as well. Certainly this novel use of CFD should
lead to drier, happier babies... until potty training starts of course!
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Time sequence showing a male diaper during normal usage
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The science of the flow of fluids in diapers is very complex, involving
material porosity, weave, and liquid viscosities. Clearly, absorbency
is critical to a good diaper design.
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