We performed first-principles calculations to investigate the energetic, electronic and optical properties of bundled armchair and zigzag carbon nanotubes (CNTs). The nanotubes are assumed to be aligned in a hexagonal closed-packed array in the bundle. The total energy and electronic band structure show stronger dependence on the orientation of the tube for the (n, n) and (n, 0) bundles if n = ...

Imbibition in a strongly wetting square tube with corner flow can be described by an interacting capillary bundle model, where the first sub-capillary describes main meniscus while others describe film flow. In this work, advanced modified model (MICBM) is developed to simulate imbibition dynamics incorporating viscous coupling effect. The conductances of each are obtained from two-phase lattic...

This paper is devoted to the presentation of an advanced model for the heat conduction processes within a finned tube bundle, typically found in air-cooled evaporators and condensers. As a result of the computational effort needed to simulate the desired fin-and-tube local unsteadiness, some actions have been undertaken in order to obtain reasonable simulation time consumption. A specific cutti...

Intravena caval respiratory support (or membrane oxygenation) is a potential therapy for patients with acute respiratory insufficiency. A respiratory support catheter is being developed that consists of a bundle of hollow fiber membranes with a centrally positioned pulsating balloon to enhance gas exchange. This study examined the influence of vessel compliance on the gas exchange performance o...

In the present study, a novel configuration of rotating tube bundle was simulated under non-isothermal hydrodynamic conditions using mixture model. Eight fins were considered in this which targeted hydrodynamics system. An aqueous copper nanofluid used as heat transfer fluid. Various operating factors, such rotation speed (up to 500 rad/s), Reynolds number (10–80), and concentration (0.0–4.0%) ...

bubble columns are gas- liquid contactors that are widely used in chemical and bio- chemical industries. high mixing that result in high heat and mass transfer rates are amongst their advantages. heat transfer in a bubble column having a bundle of heaters investigated and the variation of heat transfer coefficient with variation in heaters pitch to diameter ratios in a bundle of heaters reporte...