Thermohydraulic analysis of twisted tape inserts with SiO_2/H_2 O nanofluid in heat exchanger
Anil Kumar, Sachin Sharma, Sunil Kumar, Rajesh Maithani
Abstract
In this work the effect of geometrical parameters of the twisted tape insert on heat transfer and flow characteristics of SiO2/H2O nanofluid flow heat exchanger tube has been investigated experimentally and numerically using CFD (ANSYS 19.3). The investigation encompassed the nanofluid and geometrical parameters namely twisted-tape-width-to-tube-diameter ratio WT/DT ranging from 0.6–0.8, twisted-tape-length-to-twisted-tape-width ratio LT/DT ranging from 1.56–2.23 and particle concentration ϕ ranging from 0.50 vol%-1.25 vol% and the average size of nanoparticle diameter dnp is 30 nm. The analysis of twisted tape parameters and SiO2/H2O nanofluid as the medium has been carried out for Reynolds number in the range of 5000–17,000. The maximum Nusselt number NuTT and friction factor fTT enhancement are found to be 2.03 and 2.41 times, respectively. The maximum values of thermohydraulic performance parameter occur at a WT/DT of 0.8, LT/DT of 1.74, ϕ of 1.25 vol%, dnp of 30 nm and Reynolds number Ren of 11,000.