Showing papers in "Experimental Thermal and Fluid Science in 2012"

TL;DR: In this article, a laminar convective heat transfer and pressure drop characteristics through a uniformly heated circular tube using Al2O3-Cu/water hybrid nanofluid is presented.

TL;DR: In this paper, the effect of MWCNT nanofluid, as absorbing medium, on the efficiency of a flat-plate solar collector was investigated experimentally, which showed that by increasing the weight fraction from 0.2% to 0.4%, there is a substantial increase in the efficiency.

TL;DR: In this paper, the effects of nanofluid (Al2O3 in water 2, 3 and 4 vol%) and water as coolants on heat transfer, frictional losses, and exergy loss in a counter flow corrugated plate heat exchanger were experimentally investigated.

TL;DR: In this article, an experimental investigation on the thermo-physical properties and overall performance of MWCNT/heat transfer oil nanofluids flow inside vertical helically coiled tubes was conducted.

TL;DR: In this article, a stable colloidal suspension of magnetite (Fe 3 O 4 ) nanoparticles of average diameter 36nm was used for flow in a circular tube in the range of 3000 φ.

TL;DR: In this paper, a series of injection experiments was performed on five-spot glass micromodel which is initially saturated with the heavy oil and dispersed silica nanoparticles in water (DSNW) at different values of weight percent.

TL;DR: In this paper, the effects of twist ratios (y/D, 2.5, 3, 3.5 and 4) and clearance ratios (c/D = 0.0178 and 0.0357) were discussed in the range of Reynolds number from 5132 to 24,989.

TL;DR: In this article, the authors measured the viscosity of nanofluids formed by water, as base fluid, and solid nanoparticles of two different materials (single wall carbon nanohorn (SWCNH) or titanium dioxide (TiO2)) using a rheometer and obtained as a function of the nanoparticles mass fraction and the shear rate.

TL;DR: In this article, the thermal conductivity of ferrofluid's containing Fe 3 O 4 nanoparticles suspended in de-ionized water under magnetic field was experimentally investigated, and the saturation time and reversibility of thermal conductivities were also examined after the magnetic field is turned off.

TL;DR: In this paper, the effect of nanoparticle volume fraction on the convection heat transfer characteristics and pressure drop of TiO2 (30nm) water nanofluids with nanoparticles volume fraction between 0.002 and 0.02, and Reynolds number between 8000 and 51,000.

TL;DR: In this paper, the thermal conductivity and viscosity of several common used surfactant solutions are investigated experimentally, with regard to the effect of critical factors such as concentration, temperature and pH value.

TL;DR: In this article, the authors used high speed photography and Schlieren system to capture the spark ignition process in the scramjet combustor fueled by hydrogen equipped with multi-cavities at Mach 4 flight condition.

TL;DR: In this paper, a thin channelled copper water block of overall dimension 55 × 55 × 19 mm is used for the study. And the interface temperature of the water block is measured and a maximum reduction of 1.15°C is observed when nanofluid of 0.2% volume fraction is used as the working fluid compared to deionised water.

TL;DR: In this article, the experimental heat transfer coefficient and pressure drop measurements carried out during air forced convection through five different copper foam samples were carried out in order to increase the knowledge in heat transfer and fluid flow in metal foams.

TL;DR: In this article, screen mesh wick heat pipes were manufactured and tested to determine the thermal resistance of nanofluids such as Al2O3-water, Al 2 O3-ethylene glycol, TiO2-water and ZnO-ethylylene glycol.

TL;DR: In this article, an extensive experimental study has been carried out to investigate the heat transfer and pressure drop characteristics of CuO/Base oil nanofluid laminar flow in a smooth tube with different wire coil inserts under constant heat flux.

TL;DR: In this paper, the influence of the size of the dispersed water droplets in the micro-explosion phenomenon is studied by the hot plate technique and the variation of the temperature and the evolution of the phenomenon have been investigated using a synchronized thermocouple/high speed imaging system.

TL;DR: In this paper, the effect of contact angle on water droplet freezing process on a cold flat surface under natural convection conditions was experimentally investigated, and the experimental results showed that the contact angle has a strong influence on the freezing time.

TL;DR: In this paper, an extra-long pulsating heat pipe (ELPHP) is designed, constructed and installed in a thermosyphon solar water heater, which is made of copper tubes of internal diameter 2.0mm and length of condenser and evaporator sections are 0.8 and 0.96m, respectively.

TL;DR: In this paper, the experimental results of the flow patterns and the void fraction measurements for vertical upward and downward two phase flow were presented and the performance analysis of the available void fraction correlations was performed.

TL;DR: In this paper, a comparison of heat transfer and pressure drop characteristics of CuO/water nanofluids in a helically coiled heat exchanger held in horizontal and vertical positions is presented.

TL;DR: In this article, a copper foam-based vapor chamber was designed, built and tested, and it was found that the water and ethanol based vapor chambers have the best and worst thermal performance, respectively, among the three working fluids of water, acetone and ethanol.

TL;DR: In this paper, two different methods, cold pressing sintering and loose powder Sintering, are adopted to fabricate the biporous nickel wicks for loop heat pipes (LHPs) in the present study, the porosity of the wicks is measured by Archimedes method and radius and distribution of pores is observed by Scanning Electronic Microscope.

TL;DR: In this article, the effect of capillary wicking on micro-and nano-structured surfaces was investigated based on Kandlikar's critical heat flux (CHF) correlation dealing with wettability.

TL;DR: A detailed experimental study on aerodynamics of NACA2415 aerofoil at low Re numbers is presented in this article, where the authors show that as angle of attack and Re number increase, bubble and transition point move towards leading edge.

TL;DR: In this paper, the role of the dominating forces associated with liquid-jet breakup were quantified using dimensionless analysis by analyzing the macroscopic spray characteristics using Planar Mie-scattering technique.

TL;DR: In this article, the effect of ambient pressure on spray characteristics such as spray tip penetration, cone angle and spray area in a constant volume spray chamber was investigated by employing spray visualization and image processing techniques.

TL;DR: A comparison of thermal characteristics of Al 2 O 3 /water and CuO/water nanofluids in transition flow through a straight circular duct fitted with helical screw tape inserts was made in this paper.

TL;DR: A multi-fluid mixer by Sadatomi and Kawahara as mentioned in this paper is described as well as its performance as a micro-bubble generator for several trial products and the results of experiments and analyses are reported in the present paper.

TL;DR: In this article, the hydrodynamic study of nanofluids in microchannel is carried out and the effect of volume fraction, channel size, particle size and base fluids are presented and analyzed.