In recent years, as the mobile equipment advances, higher output and higher energy density are required of the battery which drives the mobile equipment. As one of the solutions, development of portable fuel cells (DMFC) with methanol used for fuel has been progressed and the fuel cells will be soon put to practical use. The authors have developed a small air pump (0.2W output), which is mounte...

This paper deals with new concept of compressed air energy storage system using atmospheric air at ambient temperature as a zero pollution power source for running motorbikes. The proposed motorbike is equipped with an air turbine in place of an internal combustion engine, and transforms the energy of the compressed air into shaft work. The mathematical modeling and performance evaluation of su...

A novel method of cooling rolls in hot rolling is proposed. This uses a combination solid jet nozzles and specially shaped deflecting vanes. The vanes transform the incoming cylindrical water into flat fan. Thereby, coolant can be directed hardly accessible locations whilst maintaining optimal angle impingement. allow for effectively roll surface near gap, which otherwise not possible with clas...

Using both Monte Carlo and numerical techniques, Taylor dispersion in a curved tube at low Dean numbers has been evaluated and the results are in qualitative agreement with those found by Janssen (1976) : Dn2Sc is the controlling parameter with Dell falling to about 0.2 of its straight-tube value at high values of DnaSc. Agreement with available experimental data is generally good. Further, we ...

Gradient flows for energy functionals have been studied extensively in the past. Well known examples are the heat flow or the mean curvature flow. To make sense of the term gradient an inner product structure is assumed. One works on a Hilbert space, or on the tangent space to a manifold, for example. However, it is possible to do without an inner product. The domain of the energy functionals c...

In axial compressors, the unsteady flow caused by interaction between dynamic and static cascades will make moving vanes subject to periodic forces increase risk of high-cycle fatigue fractures. this study, an “S”-type bowed guide vane was designed a 1.5-stage compressor model established. For five with different bending coefficients, numerical simulation carried out under design conditions nea...

Abstract In this article, a numerical investigation of the effect miniaturized five-hole probe downstream transonic low-pressure turbine vane row is presented. First, calibration was performed in uniform flow conditions, as case for any traditional calibration, wide range Mach number, yaw angle, and pitch angle conditions. The on general field throughout segments then evaluated by performing co...

The heat transfer performance of a solar external receiver tube with guide vanes was numerically studied under non-uniform flux conditions. Models the smooth and were built. distributions temperature, velocity, turbulence intensity, Nu predicted by these two models compared to investigate enhancement mixing effect vanes. Re α on also studied. results show that form spiraling flows, reduce maxim...