The dispersion and stability of nanofluids obtained by dispersing Al2O3 nanoparticles in ethylene glycol have been analyzed at several concentrations up to 25% mass fraction. thermal conductivity viscosity were experimentally determined temperatures ranging from 283.15 K 323.15 using an apparatus based on the hot-wire method a rotational viscometer, respectively. It has found that both increase with concentration nanoparticles, whereas when temperature increases diminishes rises. Measured...

Nanofluids are recent nanomaterials with improved thermophysical properties that could enhance the efficiency and reliability of heat transfer systems. Relevant for calculation, thin film flows, droplet impingements or microfluidic surface tension wettability. However, to date, understanding those in nanofluids field is at beginning compared transport properties. At this stage, review focus on effect nanoparticles base fluid nature, temperature, use surfactant, nanoparticle concentration,...

One of the potential applications ionic liquids (ILs) is their use as lubricants or lubricant additives. The choice cation and anion ILs, well side chain design, determine fundamental properties, which permits us to create tailor-made additives among other functional fluids. In this work we have studied 10 ILs for report densities viscosities from 283.15 K (and some at lower temperatures) up 373.15 K. fall in range hydraulic fluid lubricants. Four these were composed by...

Homogeneous stable suspensions obtained by dispersing dry TiO2 nanoparticles in pure ethylene glycol were prepared and studied. Two types of nanocrystalline structure analyzed, namely anatase rutile phases, which have been characterized scanning electron microscopy. The rheological behavior was determined for both nanofluids at nanoparticle mass concentrations up to 25%, including flow curves frequency-dependent storage loss moduli, using a cone-plate rotational rheometer. effect temperature...

The rheological behaviour of ethylene glycol-based nanofluids containing hexagonal scalenohedral-shaped α-Fe2O3 (hematite) nanoparticles at 303.15 K and particle weight concentrations up to 25% has been carried out using a cone-plate Physica MCR rheometer. tests performed show that the studied present non-Newtonian shear-thinning behaviour. In addition, viscosity given shear rate is time dependent, i.e. fluid thixotropic. Finally, strain sweep frequency tests, storage modulus G', loss G″...

This study presents new Nano-enhanced Phase Change Materials, NePCMs, formulated as dispersions of functionalized graphene nanoplatelets in a poly(ethylene glycol) with mass-average molecular mass 400 g·mol-1 for possible use Thermal Energy Storage. Morphology, functionalization, purity, and thermal stability the nanomaterial and/or were characterized. Design parameters NePCMs defined on basis temporal nanoplatelet using dynamic light scattering. Influence loading solid-liquid phase change...

Homogeneous and stable magnetic nanofluids containing iron oxide nanoparticles, α-Fe2O3 (hematite) Fe3O4 (magnetite) in ethylene glycol, were prepared at concentrations up to 25% mass fraction. Commercial Hexagonal Scalenohedral-shaped nanoparticles selected while synthesized using a coprecipitation method. The products characterized by transmission scanning electron microscopy x-ray diffraction. thermal conductivity of both was measured as function volume fraction temperature. results...

This research aims at studying the stability and thermophysical properties of nanofluids designed as dispersions sulfonic acid-functionalized graphene nanoplatelets in an (ethylene glycol + water) mixture (10:90)% mass ratio. Nanofluid preparation conditions were defined through a analysis based on zeta potential dynamic light scattering (DLS) measurements. Thermal conductivity, viscosity, density experimentally measured temperature range from 283.15 to 343.15 K nanoparticle concentrations...

The low thermal conductivity of fluids used in many industrial applications is one the primary limitations development more efficient heat transfer systems. A promising solution to this problem suspension nanoparticles with high conductivities a base fluid. These suspensions, known as nanofluids, have great potential for enhancing transfer. enhancement sulfonic acid-functionalized graphene nanoplatelet water-based nanofluids addressed work. new experimental setup was designed purpose....

The improvement in heat transfer equipment plays a significant role to enhance the overall performance of many systems and wide variety industrial processes. Heat exchangers are widely used these applications with aim limiting growing energy demand further is needed. A low-enthalpy geothermal system commonly constituted by ground exchanger, pump unit, indoor heating/cooling units. In exchanger circuit, exchange occurs between fluid wellbore through tubular section similar that inner tube...

New experimental densities are reported for squalane and branched pentaerythritol tetra(2-ethylhexanoate), PEB8, in the compressed liquid state over temperature range from (278.15 to 353.15) K pressures up 45 MPa. The reliability of technique procedure 25 MPa has been verified our previous works, present work they were checked by comparing heptane with literature data. A total 297 density values have measured a high-pressure vibrating tube densimeter. correction factor due sample viscosity...