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