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,...

This study experimentally investigates the performance of a compact gasketed plate heat exchanger (PHE) employing Al2O3 nanofluids prepared for several low concentrations (0.01, 0.05, 0.10, 0.15 and 0.20 vol%) base fluids distilled water (DW) its mixture with ethylene glycol (15% 30% EG) flow rates (0.03–0.093 l/s). The main thermophysical properties those nanofluid samples were measured. showed Newtonian rheological behaviour an increase in viscosity up to 7.5% 0.2 vol%. enhancements...

Interfacial tension and viscosity of a liquid play an important role in microfluidic systems.In this study, temperature dependence surface tension, interfacial nanofluid are investigated for its applicability droplet-based microfluidics.Experimental results show that having TiO 2 nanoparticles 15 nm diameters deionized water exhibit substantially smaller oil-based than those the base fluid (i.e.deionized water).These tensions were found to decrease almost linearly with increasing...

The superiority of nanofluid over conventional working fluid has been well researched and proven. Newest on the horizon is hybrid currently being examined due to its improved thermal properties. This paper viscosity electrical conductivity deionized water (DIW)-based multiwalled carbon nanotube (MWCNT)-Fe2O3 (20:80) nanofluids at temperatures volume concentrations ranging from 15 °C 55 0.1–1.5%, respectively. morphology suspended was characterized using a transmission electron microscope,...

Nanofluids have been presented as media to enhance the heat transfer capabilities of thermal control systems and devices both single two-phase modes. Since addition solid nanoparticles in a base fluid can significantly increase transport properties given working fluid, it impacts other that require proper evaluation before applying nanofluid system. Successful application nanofluids liquid cooling including single-phase convection exchangers like pipes thermosyphon indicated potential using...

This study reports an experimental investigation of nanoparticle sizes effects on the heat transfer characteristics hybrid nanofluids along transitional flow regime. Four different particle were used to prepare Al2O3 and MWCNT (i.e., 5 nm 20 for <7 30–50 nanoparticles). Three with combinations Al2O3(5 nm) – (<7 nm), Al2O3(20 MWCNT(<7 (30–50 nm)) at a percentage weight composition (PWC) 60:40 0.3 volume concentration prepared. Results showed that significantly affected convective nanofluids....

Flow regimes obtained as a consequence of two immiscible fluids interacting at T-junction are presented for high Capillary numbers and different flow rates the continuous dispersed phases. Through lattice Boltzmann based simulations, regime map is created that distinguishes parallel flows from droplet flows. Simulations show dependence viscosity ratio on volume droplets formed, which compared with existing experimental data. At numbers, transition zone separates shrinks, influenced by well.

Abstract Effective thermal conductivity, effective diffusivity, and specific heat of nanofluids were simultaneously measured by using a transient double hot-wire technique. Several types prepared suspending different volume percentages (1 to 5%) titanium dioxide (TiO2), aluminum oxide (Al2O3), (Al) nanoparticles in ethylene glycol engine oil. While heats these decrease substantially with nanoparticle fraction, the enhanced conductivity diffusivity found increase significantly increasing...

The ability to precisely control the motion of droplets is essential in droplet-based microfluidics. It serves as basis for various devices. This paper presents a thermal technique microdroplets at bifurcation. Control was achieved using an integrated microheater that simultaneously induces reduction fluidic resistance and thermocapillarity. temperature heater monitored by sensor. At bifurcation with symmetric branches, droplet can be split into two daughter controllable sizes or entirely...

The effective specific heat of several types nanofluids are measured by transient double hot-wire technique. Sample prepared suspending 1–5 volume percentages titanium dioxide (TiO2), aluminium oxide (A12O3) and (Al) nanoparticles in various base fluids, such as deionised water, ethylene glycol engine oil. heats these were found to decrease substantially with increased fraction nanoparticles. Besides particle fraction, materials fluids also have influence on the nanofluids. Except Al/engine...