A heat transfer tube can comprise {TAIL ~ a tube body}, and outer fins integrated with the tube body which are formed by allowing material on {HEAD ~ the tube body} to extend along radial direction of the tube body and wind and extend around the tube outer surface in helical manner, wherein microscale channels are formed on at least one lateral surface of the outer fin 
A heat transfer tube can comprise { TAIL ~ a tube body } , and outer fins integrated with the tube body which are formed by allowing material on { HEAD ~ the tube body } to extend along radial direction of the tube body and wind and extend around the tube outer surface in helical manner , wherein microscale channels are formed on at least one lateral surface of the outer fin
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH