Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2014-01-01

Journal: NUMERICAL HEAT TRANSFER PART A-APPLICATIONS

Included Journals: EI、SCIE

Volume: 66

Issue: 6

Page Number: 646-668

ISSN: 1040-7782

Abstract: Turbulent flow characteristic of TiO2-water nanofluids inside a horizontal circular tube is studied numerically by single-phase model, mixture multiphase model and Eulerian-Eulerian multiphase model. The flow characteristic is accounted from micro-flow aspect in order to reveal the mechanism of heat transfer enhancement in nanofluids. A new empirical correlation of nanoparticle viscosity has been proposed for multiphase models, which is much more precise than traditional empirical models. The presence of nanoparticles intensified local micro-flow and improved overall turbulence intensity significantly. The current study suggests that a thorough understanding on flow characteristics of nanofluids is essential for proposing mathematical description nanofluids flow.