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