Centrifugal pumps are extensively used to transfer liquids to the required head with the help of centrifugal forces. The impeller forms the crucial part of the centrifugal pumps. Its shapes, dimensions, number of the blades affects the overall performance of the pumps.In this paper, effect of number of blades in the impellers are investigated using CFD tool. Considering the number of blades in ...

In an effort to facilitate the efficiency of human immunodeficiency virus type 1 (HIV-1) and/or human cytomegalovirus (HCMV) infection in primary monocyte/macrophages in vitro, the effect of low-speed centrifugation was studied. The infectivity of three strains (Bal, Ada-M, and IIIB) of HIV-1 tested was significantly enhanced by centrifugal inoculation at a force of 1500g for 60 min. Reverse tr...

In this article, energy optimization of the cooling system IKEA Budaörs is carried out. The served by a centrifugal water chiller and includes large-volume buffer tank. facility operates hydraulic storage tank only during transitional period. main goal to reduce consumption changing operating strategy existing system. To test strategies, operation thermal load shopping center summer season had ...

with the prolonged use of domestic centrifugal pump, due to erosion, corrosion and an unbalance the sever vibration of the pump are resulted. an erratic sound coming out of pump makes the user uncomfortable. here, tuned vibration absorber (tva) is used as a vibration controlling device. it is designed to reduce the rms velocity below 20% of the circumferential speed, at which the impeller is ba...

OBJECTIVE This study was carried out to evaluate whether the type of pump used for cardiopulmonary bypass (CPB; roller vs. centrifugal) can affect mortality or the neurological outcomes of adult cardiac surgery patients. METHODS Between 1994 and June 1999, 4000 consecutive patients underwent coronary and/or valve surgery at our hospital; of these, 2213 (55.3%) underwent surgery with centrifug...

surge is one of the two destructive factors in compressors. surge is the stream instability phenomenon in compressor that imposes severe damages to the compressors. nowadays, suppressingsurge phenomenon is one of the most important issues in oil and gas industries, especially when flow reduction or gas reflux is considered. according to moore-greitzer compressor model, this paper designs an act...

Evaluation of the centrifuges used in the mycobacteriology laboratory indicated a failure to develop sufficient relative centrifugal force for optimal concentration of acid-fast bacilli. Retrospective analysis of 14,509 specimens received between 1 July 1973 and 30 June 1975 and sedimented at 1,260 x g relative centrifugal force revealed a positive smear rate of 1.8% and a positive culture rate...

There have been several results on the nonlinear control of a ball and beam system. However, the existing methods often consider a simplified model, and particularly they neglect the centrifugal force term. In this paper, we propose a full-model based adaptive state feedback controller with dynamic gain in order to control the ball and beam system using the centrifugal force term. The dynamic g...

Centrifugal pumps will not pass gross quantities of gaseous emboli due to the nonocclusive nature of the pump. However, retrograde flow can occur under circumstances that include: product malfunctions, low flows, and human errors. Negative pressure created by falling arterial perfusate can draw air into the cannula. Food and Drug Administration (FDA) records about centrifugal pump malfunctions ...

-Changing some geometric characteristic of the impeller in centrifugal pumps improves their performance. It is known that blade exit angle plays very important role in the performance of a centrifugal pump. To investigate effect of blade exit angle on the performance of centrifugal pump by means of experiment is very expensive and lengthy process. Due to expensive and lengthy process, it can be...