...Jae Bong Lee; Seong Hyuk Lee; Chang Kyoung Choi aluminium contact angle drops flow visualisation high-speed optical techniques hole density hydrophobicity impact (mechanical) microfluidics milling machines surface energy surface roughness surface texture water wetting 27...

..., for enhancing rapid heat transfer, and also for powder metallurgy (i.e., supercooled powder production, wherein materials turn superplastic with enhanced ductility). This paper discusses results of experiments conducted with various molten metals, specifically, tin, gallium, galinstan, and aluminum interacting...

... behavior of these new enhanced surfaces, which present high heat transfer area per unit of volume at the expense of high pressure drop. The paper presents the experimental heat transfer and pressure drop measurements relative to air flowing in forced convection through four different aluminum foams, when...

... 2010 01 02 2011 01 02 2011 alumina aluminium convection copper copper compounds gold liquid theory nanofluidics nickel organic compounds thermal conductivity titanium compounds viscosity water nanofluid convective heat transfer coefficient thermal conductivity...

...Patrick T. Garrity; James F. Klausner; Renwei Mei The air side heat transfer performance of three aluminum foam samples and three modified carbon foam samples are examined for comparison with multilouvered fins often found in compact heat exchangers. The aluminum foam samples have a bulk density...

... are made of aluminum, with no contact resistance between the base and the fins, and are heated using foil electrical heaters. In the corresponding numerical study, the sinks and their environment are modeled using the FLUENT 6.3 software. In the experiments, sink bases of 100 × 100 mm 2 and 200 × 200 mm 2...

...S. W. Dean; M. L. Pantoya; A. E. Gash; S. C. Stacy; L. J. Hope-Weeks Flame propagation and peak pressure measurements were taken of two nanoscaled thermites using aluminum (Al) fuel and copper oxide (CuO) or nickel oxide (NiO) oxidizers in a confined flame tube apparatus. Thermal equilibrium...

..., or allow others to do so, for United States Government purposes. pump-probe thermoreflectance thin film thermal conductivity thermal boundary conductance radial heating cross-plane transport aluminium heat transfer laser beam effects multilayers thermal conductivity thermoreflectance...

... columns were formed by depositing molten aluminum alloy (A380) droplets on top of each other. A pneumatic droplet generator was used to create uniform, 0.8 mm diameter, molten aluminum droplets. The droplet generator was mounted on a stepper motor and moved constantly so as to maintain a fixed distance...

...Wen-Jei Yang; Nengli Zhang; Daniel L. Vrable This paper introduces a novel heat transfer enhancement surface, referred to as metal-graphite composite surface. It is comprised of high thermal conductivity graphite microfibers interspersed within a metal matrix (copper or aluminum) to enhance...

...Yorwearth L. Jamin; A. A. Mohamad The main objective of this experimental study is to quantify and compare the heat transfer enhancement of carbon foam and aluminum fins in natural convection. The study measures steady state heat transfer from a heated vertical pipe, with and without porous medium...

..., aluminum, copper, silver, Constantan, and silicon; covering a range of Reynolds number (220–900), Ekman number ( 7.08 × 10 − 5 – ∞ ) , nozzle-to-target spacing ( β = 0.25 – 1.0 ) , disk thicknesses to nozzle diameter ratio ( b ∕ d n = 0.25 – 1.67 ) , and Prandtl number (1.29–124.44) using ammonia ( N H 3...

...G. Venugopal; M. Deiveegan; C. Balaji; S. P. Venkateshan Transient cooling experiments of a heated vertical aluminum plate with an embedded heater, in quiescent air, were conducted for the simultaneous estimation of total hemispherical emissivity and specific heat of the plate material. During...

..., and Nusselt number are computed by imposing periodic boundary conditions for aluminum foams saturated with air or water. The computed values compare well with existing experimental measurements and semiempirical models for porosities greater than 80%. The effect of different foam packing arrangements...

...-phonon processes in thermal boundary conductance at high temperatures. alumina aluminium chromium dielectric materials interface phonons micromechanical devices phonon-phonon interactions platinum silicon thermal conductivity thermoreflectance thermal boundary conductance diffuse...

...Ken I. Salas; Anthony M. Waas Convective heat transfer in aluminum metal foam sandwich panels is investigated with potential applications to actively cooled thermal protection systems in hypersonic and re-entry vehicles. The size effects of the metal foam core are experimentally investigated...

... comparisons between GF and aluminum foam. Comparisons of the pressure drop indicate that both normal and compressed aluminum foams are significantly more permeable than GF. Results of the heat transfer indicate that the maximum possible heat dissipation from a given surface is reached using very thin layers...

... objective of this experimental study is to quantify and compare the heat transfer enhancement of carbon foam and aluminum fins. The study measures the heat transfer rate and pressure drop from a heated vertical pipe, with and without porous medium, in forced convection. The largest increase in Nusselt...

...S. M. Begley; M. Q. Brewster The combustion behavior of nanometer-scale energetic materials is much different than micron size or larger materials. Burning rates up to 950 m∕s have been reported for a thermite composition of nanosized aluminum and molybdenum trioxide. The energy transport...

... aluminum foam samples heated from below, for a range of Reynolds numbers and pore densities. The foam samples were either 5.08- or 20.32 ‐ cm -thick in the flow direction. Reasonably good agreement was found between the analytical and the experimental results for a considerable range of Reynolds numbers...