The characteristics of pore scale vortical structures observed in moderate Reynolds number flow through monodisperse packed beds of spheres are examined. Our results come from direct numerical simulations of flow through (i) a periodic, simple cubic arrangement of 54 spheres, (ii) a wall bounded, close packed arrangement of 216 spheres, and (iii) a realistic randomly packed tube containing 326 ...

which have penetrated a considerable layer of absorbing material in the laboratory. If such particles w'ere produced by an exchange process, their detection would depend on the life of the neutral particle and the frequency of occurrence of the exchange. Recently de Vos and du Toit~ reported an effect which they ascribed to neutral particles in incident cosmic rays detected by means of parafFIn...

Thermal Energy Storage (TES) is a key feature in the sizing of thermal systems and energy management. The Phase Change Material (PCM) can store huge amount heat form latent heat. However, good design TES unit required to absorb charge quickly. In present study, combination optimum fin nanoadditives are used shell tube shape unit. Taguchi optimization method employed maximize melting rate by opt...

We study the set of all pseudoline arrangements with contact points which cover a given support. We define a natural notion of flip between these arrangements and study the graph of these flips. In particular, we provide an enumeration algorithm for arrangements with a given support, based on the properties of certain greedy pseudoline arrangements and on their connection with sorting networks....

In the present work, three-dimensional numerical analysis was carried out for thermo-fluid of annular fin-and-tube heat exchangers (AFTHE) with circular fins and elliptical having varying Reynolds number (Re) changed from 4000 to 9000. The effects angle attack (?) ratio long diameter short (LDR) on transfer characteristics flow structures were studied analyzed in inline arrangement tubes. therm...

Ordered mesoporous silicas are widely used in separation science and catalysis, however, their slow batch synthesis is a barrier to scale-up new applications. SBA-15 one of the most extensively studied commercially available silicas, whose textural properties can be readily tuned through judicious choice conditions. Here we demonstrate continuous flow high yield at 80 °C using simple tube react...