Improvement of Rate of Heat Transfer in a Circular Tube by Various Insert, an Experimental Investigation

Abstract

An experimental tested examination of turbulent (zigzag) flow heat transfer improvement and features of friction in the flow of a circular pipe. The circular pipe tapes tidied come in two varieties: (i) standard tapes with twisted and (ii) alternate (substitute) twisted flow in both directions, counter clockwise and clockwise (CC & C) tapes. Eight varied types of CC-C are experimented in this work. There are tapes with 3 types of twist ratios available; y/w = 2.5, 3.5, and 4.5 & every having 3 twist angles given θ = 30ᶿ, 60ᶿ & 90ᶿ. Water was used as the functioning fluid in the experiments and with Reynolds numbers (Re) ranging between 2000 and 32000. Under the same operating conditions, twisted-tapes CC–-C have a greater rate of transfer of heat, factor of friction & transfer of heat enhancement index than normal tapes. The findings also show that as the twist ratio values decrease, the heat transmission rate of the CC—C tapes enhances but the twist angle increases with increased heat transfer. The maximal heat transfers more than those with the normal(plane) tube near improvement indexes CC & C twisted tapes with θ = 90ᶿ are 1.40, 1.34, and 1.30, respectively. When using CC––C twisted tapes, there is additional discussion of the connection between the friction factor (fr) and the Nusselt umber (Nu). The experimental result is within +14 and -14 percentage (%) of the expected Nu number and friction factor (fr), respectively.