Experimental study on thermo-hydraulic performances of TiO 2-H 2O nanofluids in a horizontal elliptical tube

摘要

Graphical abstractFigure comprehensive analysis of thermo-hydraulic performance.Display OmittedHighlights?Morphologies of nanoparticles and stability of nanofluids are studied.?Comprehensive evaluation for thermo-hydraulic performance is studied.?Computational formulas for thermo-hydraulic performance are put forward.AbstractStable TiO2-water nanofluids are prepared by a two-step method, and the morphologies of nanoparticles and the stability of nanofluids are investigated. The heat transfer and flow characteristics of nanofluids flowing through a horizontal circular tube and a horizontal elliptical tube are experimentally investigated. The effects of nanoparticle mass fractions (Φ?=?0.1?wt%,Φ?=?0.3?wt%,Φ?=?0.5?wt%) and Reynolds numbers (Re=5000-15,275) on the Nusselt number and flow frictional resistance coefficient are discussed. In addition, computational formulas for heat transfer and flow performances are put forward based on the experimental data using the polynomial fit technique. Also, thermo-hydraulic comprehensive performances of nanofluids in the horizontal circular tube and the horizontal elliptical tube are studied.]]>