Further system efficiency can be achieved by operating with multiple heating zones to provide {HEAD ~ a high heat flux} when {TAIL ~ the apparent viscosity} of the gas saturated slurry is highest 
when
Further system efficiency can be achieved by operating with multiple heating zones to provide { HEAD ~ a high heat flux } when { TAIL ~ the apparent viscosity } of the gas saturated slurry is highest
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH