The cavity may include a plurality of pedestals and protrusions configured to create one or more spirals flow {HEAD ~ paths} of {TAIL ~ a gas} traveling through the cavity 
The cavity may include a plurality of pedestals and protrusions configured to create one or more spirals flow { HEAD ~ paths } of { TAIL ~ a gas } traveling through the cavity
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH