Currently, various products containing bamboo charcoal are popular. In this study, thermal insulation composites were manufactured with PET non-woven fabrics and bamboo charcoal woven fabrics. Bamboo charcoal can radiate far infrared rays and absorb smells, so it is used for textiles, deodorant materials, bedding, pillows, and so on. Non-woven fabrics were made with hollow and spiral polyester staple fibers, and had superior thermal insulation. The mechanical properties, thermal conductivity, and air permeability of the composites were evaluated. When the ratio of the low melting point fibers was 30%, the maximum breaking strength of the thermal insulation composites exceeded that in any other ratio conditions. Moreover, the thermal insulation of the composites was superior when the ratio of the low melting point fibers decreased. The air permeability of the thermal insulation composites increased with decreasing ratios of the low melting point fibers. The thermal insulation composites can be used in daily commodities and industrial products.

No abstract

No abstract

When a generated solitary wave starts to propagate, it needs an establishment distance to create fully developed velocity profiles. We consider that the solitary wave moving in a viscous fluid under laminar flow. An important detail to state is the proper location to measure the solitary wave velocity profile due to its finite extent. This article discusses the establishment distance and the reattachment point on the bottom in the wave’s deceleration phase.

In this study, we numerically investigated the vortex patterns and free-surface deformations of a solitary wave interacting with a bottom-mounted plate at various inclinations in shallow water. Assuming two-dimensional, incompressible, and non-breaking conditions, we considered a viscous fluid based on the streamfunction-vorticity algorithm used in Navier–Stokes equations. We solved the governing equations by finite analysis, and used an averaged two-time step method to consider nonlinear conditions on the free surface. To fit the irregular boundaries and reveal the fine details of the vortex phenomenon, we applied a transient boundary-fitted grid along with a local-grid-refinement technique and examined the vortex mechanics around the submerged barrier. We then compared the numerical solutions obtained for the flow patterns with existing experimental observations to ensure the efficiency and accuracy of the numerical model. In addition, we systematically simulated other cases using this model to explore kinematic phenomena such as streamlines, equi-vorticity lines, streak lines, timelines, and path lines.