Numerical analyses of the thermal performance of SiC nanofluids in flat tube with twisted tapes

Abstract

This study numerically investigates the thermal performance of a flat tube with a SiC/water nanofluid as the working medium. The study investigates the effects on different twisted tape insert models, including double twisted tapes (varying twist ratios), triangle corrugated tapes, and double twisted circular corrugated tapes. The results are compared to those of a flat tube without twisted tape to make sure they are correct. The results indicate that tubes with twisted tapes have much better thermal performance than plain tubes. According to the findings, flat tubes with twisted tapes perform significantly better thermally than flat tubes.  The greatest improvement in heat transfer by a double-twisted tape with a 25 mm twist pitch (Model 4), which increased the Nusselt number by 44%. A double twisted tape with a triangle corrugation (Model 5) also showed an impressive improvement of 38%. But Model 4's enhanced thermal performance means that it has a much higher friction factor than Model 5, for both water and nanofluid.