Heat transfer and pressure drop characteristics in a circular tube fitted with and without V-cut twisted tape insert

• Published in: International communications in heat and mass transfer Vol. 38; no. 3; pp. 329 - 334
• Main Authors: Murugesan, P., Mayilsamy, K., Suresh, S., Srinivasan, P.S.S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2011; Elsevier
• Subjects: Applied sciences; Circular tubes; Devices using thermal energy; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fluid flow; Friction factor; Heat exchangers (included heat transformers, condensers, cooling towers); Heat transfer; Heat transfer augmentation; Inserts; Nusselt number; Pressure drop; Thermal performance factor; Twist ratio; V-cut; Vanadium; Thermal performance factor; Friction factor; V-cut; Twist ratio; Heat transfer augmentation; Twisted shape; Nusselt number; Test facility; Pressure drop; Heat exchanger; Notch; Circular pipe; Experimental study; Insert; Performance; Heat transfer; V shape
• ISSN: 0735-1933; 1879-0178
• DOI: 10.1016/j.icheatmasstransfer.2010.11.010

The effect of V-cut twisted tape insert on heat transfer, friction factor and thermal performance factor characteristics in a circular tube were investigated for three twist ratios (y = 2.0, 4.4 and 6.0) and three different combinations of depth and width ratios (DR = 0.34 and WR = 0.43, DR = 0.34 and WR = 0.34, DR = 0.43 and WR = 0.34). The obtained results show that the mean Nusselt number and the mean friction factor in the tube with V-cut twisted tape (VTT) increase with decreasing twist ratios (y), width ratios (WR) and increasing depth ratios (DR). Subsequently an empirical correlation also was formulated to match with experimental results with ± 6% variation for the Nusselt number and ± 10% for the friction factor.