Heat Transfers in Tubes Fitted with Single, Twin, and Triple Twisted Tapes

Turbulent heat transfer enhancement by counter/co-swirling flow in a tube fitted with twin twisted tapes

“…A comparative study of heat transfer and friction factor in the round tubes fitted with single, twin and triple twisted tapes was reported by Chang et al [8]. For their findings, the heat transfer enhancements achieved for laminar flows in the tubes fitted with single, twin and triple twisted tapes were, respectively, 1.5-2.3, 1.98-2.8 and 2.86-3.76 times of the Dittus-Boelter levels.…”

The effect of different inlet conditions of air in a rectangular channel on convection heat transfer: Turbulence flow

“…Methods of the PHE have been extensively explored with the attempts to overcome the thermal problems subject to high heat flux [4]. A variety of surface ribs [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], perforated baffle [22][23][24][25][26][27], pin-fins [28][29][30][31][32], Snail, propeller, twisted and winglet-type vortex generators [33,34,30,[35][36][37][38][39][40][41][42][43][44][45][46] have been devised to enhance heat transfer rates in ducts. However, it is shown in the literature review that detail exploration of turned flow in the channel needs more extensive study.…”

Performance Assessment in a Heat Exchanger Tube with Opposite/Parallel Wing Twisted Tapes

“…Figure 6 shows the influence of O-Tri/O-Rec/O-Tra/P-Tri/P-Rec/P-Tra on the thermohydraulic performance behaviors. All thermohydraulic performances are evaluated at equivalent pumping power constraint [40][41][42]. For the tubes equipped with O-Tri/ORec/O-Tra/P-Tri/P-Rec/P-Tra, thermohydraulic performance considerably decreases as the Reynolds number increases and consistently above unity for the present Reynolds number range.…”