The performance of an externally pressurized gas journal bearing lubricated with R134a vapor used in oil-free refrigeration centrifugal compressor is calculated by solving Reynold equations the finite difference method (CFD). load capacity, stiffness and mass flow rate refrigerant under conditions various operational parameters are obtained compared that air bearings. In addition, influences av...

Solid rotor alternator is of great importance at high ratings for generation of electric power as they can with stand huge centrifugal forces developed in the alternator. When a non liner load is connected to such an alternator network it invariably injects harmonics into the system which becomes a power quality issue. In order to compensate for the harmonic content a shunt active filter is con...

Centrifugal pumps are an integral part of plants used in process industries. The flow structure within a centrifugal pump is very complex due to the interaction between the rotating impeller and the geometric features around it. In the present study, numerical investigations on a centrifugal pump have been carried out using a Computational Fluid Dynamics (CFD) based solver. This study employs f...

Repetitive acoustic stimulation, auditory fear conditioning, and focal electric stimulation of the auditory cortex (AC) each evoke the reorganization of the central auditory system. Our current study of the big brown bat indicates that focal electric stimulation of the AC evokes center-surround reorganization of the frequency map of the AC. In the center, the neuron's best frequencies (BFs), to...

The aim of this paper is to present a methodology for optimizing the operation of compressors in parallel in process industries. Compressors in parallel can be found in many applications for example in compressor stations conveying gas through long pipelines and in chemical plants in which compressors supply raw or processed materials to downstream processes. The current work presents an optimi...

According to star graph and winding distribution, MMFs of three kinds 12-slot/10-pole multi-phase multi-layer layout are analyzed by the improved function method. Analysis results show that can suppress even order (12n ± 1) harmonics, thereby reducing eddy-current loss in PMs. Based on unfolded LPMSM model, rotor MMF, air gap flux density, no-load back-EMF analytical permeance method, which is ...

Steel piles below high-rise buildings may carry larger varying axial force generated by the overturning moment than those low- or medium-rise buildings. On top of that, subgrade lateral stiffness reduces drastically due to soil liquefaction during a significant earthquake. pile’s horizontal strength decrease lower position inflection point. In this paper, centrifugal tests superstructure with h...

Centrifugal partition chromatography is a liquid-liquid separation method well adapted for the fractionation or purification of natural compounds from plant extracts. However, following the preparative isolation, the fractions collected must be analysed by high-performance thin-layer chromatography or high-performance liquid chromatography to evaluate their composition and/or their purity. Thes...

Fabrication of Al-Al₃Ti functionally graded materials (FGMs) under the centrifugal force has recently attracted some attention. The controlled compositional gradient of the fabricated FGMs, the low cost of the process, and the good mold filling, are the main advantages of the centrifugal method (CM). Using the conventional CM techniques such as the centrifugal solid-particle method and centrifu...

A prototype of a non-occlusive pressure-regulated blood pump (M-pump) was evaluated in-vitro for safety in a comparative study with the roller and centrifugal pumps. The M-pump consists of collapsible tubing of unique design wrapped under tension around a rotor without a stator. The prototype M-pumps were tested in vitro to evaluate performance with respect to flow/ pressure characteristics, he...