Henry Spencer wrote:
We did some experiments with porous sintered metals for transpiration cooled chambers. The flow instabilities are ugly, and we slagged several chambers before going back to milled slot regenerative cooling. Better to use well controlled manifolds and orifices. Laminate structures (or platelets as Aerojet calls them) can hide a lot of complexity in an elegantly simple part.On Sun, 2 Feb 2003, Donald Qualls wrote:The problem with a metal foam is that there's no reliable way to ensure that every pore gets adequate flow without pumping much more water than most of the pores need...
Worse, if (dim) memory serves, there are flow instabilities -- associated
with things like the temperature dependence of viscosity -- which tend to
guarantee that you *don't* get even flow out of a foam, unless you really
flood it.
--
Doug Jones
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