The Rolls-Royce University Technology Centre at the University of York has spent the past two years introducing a reuse initiative in the Control Systems Engineering department of Rolls-Royce Aerospace in Derby, England. During this time reuse has begun the progression from an ‘ad hoc’ adjunct to the system production process to a systematic, well managed and organised core technique. This pape...

The flow in an enclosed completely filled rapidly rotating cylinder that is driven by the differential corotation of the top lid is studied numerically. Although the flow is in a very simple geometry, the fast background rotation and large differential rotation of the lid lead to very thin boundary layers with a variety of instability modes with very fine spatial scales as well as inertial wave...

This chapter deals with the optimal design of the most expensive part of a pressurised irrigation system, i.e., its pipe network. The problem of calculating the optimal pipe size diameters of an irrigation network has attracted the attention of many researchers and designers. During the process of designing an irrigation pipe network, the hydraulic engineer will face the problem of determining ...

Abstract. If a fluid enters an axially rotating pipe, it receives a tangential component of velocity from the moving wall, and the flow pattern change according to the rotational speed. A flow relaminarization is set up by an increase in the rotational speed of the pipe. It will be shown that the tangentialand the axial velocity distribution adopt a quite universal shape in the case of fully de...

The effect of weak stratification on turbulent plane Couette flows is studied by means direct numerical simulations at the Prandtl number air. We demonstrate that tends to reduce intensity streamwise streaks in channel center, eventually breaking characteristic large-scale rolls. By analyzing bursting mechanism (i.e. sweeps and ejections) responsible for vertical momentum transfer, we observe w...

We investigate both numerically and analytically the convective instability of granular materials by two dimensional traffic equations. In the absence of vibrations traffic equations assume two distinctive classes of fixed bed solutions with either a spatially uniform or nonuniform density profile. The former one exists only when the function V (ρ) that monitors the relaxation of grains assumes...

Experimental and numerical studies of steady longitudinal convection rolls that develop in a Poiseuille air flow in a rectangular channel heated from below and cooled from the top are conducted in the range 3500 ≤ Ra ≤ 6000 and 20 ≤ Re ≤ 200. The effect of the lateral vertical walls on the onset and development of the convection cells is investigated by changing the transverse aspect ratio of t...

In recent years, the number of persons awarded disabled-worker benefits has rapidly increased, but no corresponding rise has occurred in the number leaving the rolls for recovery. A comparative analysis has been made of the demographic, disability, and benefit characteristics of a sample of disabled workers awarded benefits in 1972 who left the rolls for recovery and the characteristics of thos...

This paper describes the process of pattern selection between rolls and hexagons in Rayleigh-l~nard convection with reflectional symmetry in the horizontal midplane. This symmetry is a consequence of the Boussinesq approximation, provided the boundary conditions are the same on the top and bottom plates. All possible local bifurcation diagrams (assuming certain non-degeneracy conditions) are fo...

The biological values of the proteins of pea meal, rye bread (baked from 70 % rye flour by the Municipal Bakeries in Warsaw), of two mixtures of wheat rolls and pea meal and of two mixtures of rye bread and pea meal have been determined by the method of Osborne et al. [1919]. The bread was dried at 350 and the dry product ground in a mill. The peas were boiled, dried and ground. The following m...