c) available energy consuming means for pre mixing {HEAD ~ a portion} of said first fluid stream with another portion of said first fluid stream to form, within said conduit, a premixed first fluid stream generally separate from {TAIL ~ said second fluid stream} 
c ) available energy consuming means for pre mixing { HEAD ~ a portion } of said first fluid stream with another portion of said first fluid stream to form , within said conduit , a premixed first fluid stream generally separate from { TAIL ~ said second fluid stream }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL