Influences of peripherally-cut twisted tape insert on heat transfer and thermal performance characteristics in laminar and turbulent tube flows

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The heat transfer enhancement techniques and their Thermal Performance Factor (2018, background): “…10000 1.53 3.73 14.8 Eiamsa-ard et al. (2013a) Twin Delta winged tape Twist ratio-3,Wing tip angle-20 -60 ,Wing declination angle-15 5000 1.24 2.54 8.78 Water Twin Delta winged tape 10000 1.12 2.10 6.64 Eiamsa-ard et al. (2010a) Delta winglet twisted tape Twist rati-3–5, Depth of wing cut ratio-0.”
3-D Numerical Simulation of Heat Transfer and Turbulent Flow in a Receiver Tube of Solar Parabolic Trough Concentrator with Louvered Twisted-tape Inserts (2014, background): “[14] investigated influences of the twisted-tape insert with peripherally-cut on heat transfer rate for laminar and turbulent flow regimes.”
An overview of heat transfer enhancement methods and new perspectives: Focus on active methods using electroactive materials (2013, background): “broken insert [42], peripherally cut [43], serrated [44], with oblique teeth [45], perforated [46] and many other twisted tape shapes (delta-winglet, trapezoidal-cut, square-cut), with wire-nail, with alternate-axes and variously shaped wings (triangle, rectangle, trapeze).”
Enhancement of heat transfer using CuO/water nanofluid and twisted tape with alternate axis☆ (2011, methodology): “modified twisted tapes were employed with water (base fluid) and it was found that the heat transfer enhancement depended strongly on their shapes and geometries [11–24].”