Mass fraction

Quantum mechanics

Magnetic field

Turbulence

Engineering

Nanoparticle

Pure mathematics

Heat transfer

Hydraulic diameter

Materials science

Reynolds number

Tube (container)

Heat transfer enhancement

Field (mathematics)

Mass transfer

Mechanical engineering

Physics

Nanotechnology

Mathematics

Electromagnet

Composite material

Nanofluid

Mechanics

Magnet

International Journal of Heat and Mass Transfer

An experimental system is established to investigate the thermo-hydraulic performance of Fe3O4-water nanofluids in a corrugated tube under various magnetic fields. The influences of magnetic induction intensities (B = 0 G, 100 G, 200 G, 300 G), nanoparticle mass fractions (ω = 0.0%, 0.1%, 0.3%, 0.5%), electromagnet arrangement modes (one-side electromagnet and two-side staggered electromagnet), kinds of tubes (smooth tube and corrugated tube), Reynolds numbers (Re = 800–12,000) on flow and heat transfer characteristics are discussed. It is obtained that the augmentation of heat transfer is more sensitive to high nanoparticle mass fraction, high magnetic induction intensity, two-side staggered electromagnet and corrugated tube. A Comprehensive evaluation index is applied to estimate the thermo-hydraulic performance. It can be discovered that the comprehensive evaluation index increases with the increasing Reynolds number at first and then decreases, and the rough surface of corrugated tube delays the appearance of critical Reynolds number.

Effects of magnetic field on thermo-hydraulic performance of Fe3O4-water nanofluids in a corrugated tube