An ordered packing for {HEAD ~ mass transfer} and heat exchange processes includes {TAIL ~ pre formed individual parts} 
An ordered packing for { HEAD ~ mass transfer } and heat exchange processes includes { TAIL ~ pre formed individual parts }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL