No abstract

In this investigation, heat transfer characteristics of Multi-Walled Carbon Nanotubes/water nanofluids are studied experimentally in a triple concentric tube heat exchanger under parallel flow configurations and compared with water. The Multi-Walled Carbon Nanotubes/water nanofluids are formulated for 0.2, 0.4 and 0.6% nanoparticle volume concentrations using a two-step method by adding sodium dodecylbenzene sulfonate surfactant. At 0.6% particle volume concentration, the Nusselt number is found to be 10% higher compared with water at 7500 Reynolds number. In this experimental investigation, it is found that at Reynolds number 9500, the overall heat transfer coefficient is enhanced by 15% and pressure drop enhanced by 15% compared with water at 6500 Reynolds number and friction factor is enhanced by 16% compared with water at 0.6% Multi-Walled Carbon Nanotubes/water nanofluids concentration.

Aluminum honeycomb core sandwich panels are now commercially available and are widely used as light weight materials in aircraft, naval and other applications because of their high strength to weight ratio, high bending stiffness, fire retardant resistance, insulation properties and sound attenuation properties. In all these applications extensive joining is encountered in fabricating the panels to complex shapes. This paper has investigated various edging and configuration details to secure butt joints with adequate soundness through adhesive joining methods. The compression strength of the joints has been assessed experimentally. The configuration of each butt joint is discussed and best combinations of edging and configuration are recommended for successful fabrication of complex assembles with aluminum honey core sandwich panels.