NUMERICAL INVESTIGATION TO EVALUATE THE PERFORMANCE OF HELICAL COILED TUBE HEAT EXCHANGER WITH AND WITHOUT NANOFLUID

摘要

A numerical analysis presented out to simulate internal forced convection and temperature distribution in helical coil tube with and without nanofluid. An ANSYS FLUENT package 14.1 commercial copy with SOLID WORK and GAMBIT software program is employed. The flow pattern and temperature distribution in helical coil tube heat exchanger is studied with and without nanofluid. Numerical work included two parts: the first is included helical coil heat exchanger with optimum curvature ratio(17). An optimum helical coil pitch has been used to study the temperature distribution and flow pattern difference along the turns without nanofluid. The second part included studying the effect of using (Oxide Titanium TiO_2) nanoparticle powder with 20 nm diameter dispersed in distilled water with 0.6% volume concentrations on the same above variables. Temperature contours showed that the temperature decreased along the coil. Also there is difference in temperature between turns. After turn nine the difference become less. The results showed enhancement in the heat flow for fluid with nanofluid compared to without nanofluid.