TY - JOUR
TI - Fluid flow and heat transfer enhancement in wings with combined solid ring twisted tape inserts circular heat exchanger tube
AU - Datt Ravi
AU - Bhist Mangal Singh
AU - Kothiyal Alok Darshan
AU - Maithani Rajesh
AU - Kumar Anil
JN - Thermal Science
PY - 2019
VL - 23
IS - 6
SP - 3893
EP - 3903
PT - Article
AB - Experimental examination is carried out to study the turbulent heat transfer  and fluid flow characteristics in circular heat exchanger tube using  combined wing with solid ring twisted tape inserts. A series of experiments  has been performed with the range of Reynolds number (Re) varied from 3000  to 21000, number of twisted taped inserts, NTT varied from 1.0 to 4.0 with  constant value of other twisted tape parameters such as rings pitch ratio,  dR/DT=1.0, wing pitch ratio, PW/WT=3.0 and wing depth ratio Wd/WT=1.67.  Based on the examined, turbulent heat transfer and fluid flow in wing with  combined solid ring twisted tape inserts results are compared with plain  circular tube under same operating conditions. The experimental results show  that the heat transfer is increased around 5.66 times than plane circular  heat exchanger tube. The thermal and hydrodynamic performance parameter  based on equal pumping power, ηρ was found to be highest for NTT=3.0. The  optimum value of thermal and hydrodynamic performance has been found to be  2.74 for Re of 3,000 within the range of the parameters investigated.  Multiple wings with solid rings twisted tape inserts have been also shown to  be thermally as well as hydraulically better in comparison to other similar  twisted tape insert geometries.