Results 11 to 20 of about 3,054 (215)

Measured Air Flow Leakage in Facemask Usage

International Journal of Environmental Research and Public Health, 2023
The importance of wearing a facemask during a pandemic has been widely discussed, and a number of studies have been undertaken to provide evidence of a reduced infectious virus dose because of wearing facemasks. Here, one aspect that has received little attention is the fraction of breathing flow that is not filtered because it passes as leak flow ...
Poul S. Larsen, John Heebøll, Knud Erik Meyer   +2 more
openaire   +2 more sources

Retrograde Flow Cement Leakage during Kyphoplasty

Maedica - A Journal of Clinical Medicine, 2022
Objective: To report a rare event of a retrograde flow of cement leakage during balloon kyphoplasty and discuss the possible mechanism. Methods:We present a 55-year-old male patient, who underwent a 4-level balloon kyphoplasty for Langerhans histiocytosis that had spread to the spine.
Kalliopi, Alpantaki, Christos, Koutserimpas, Nikolaos-Achilleas, Arkoudis, Alexander, Hadjiapavlou   +3 more
openaire   +2 more sources

Accuracy Investigations of Dynamic Characteristic Predictions of Tip Leakage Flow Using Detached Eddy Simulation

Aerospace, 2023
The accurate prediction of tip leakage flow is the premise for flow mechanism analysis and compressor performance optimization. The detached eddy simulation (DES) method, which compromises cost and accuracy, has excellent potential for a high Reynolds ...
Shiyan Lin, Ruiyu Li, Limin Gao, Ning Ge
doaj   +1 more source

Effect of an Axially Offset Impeller on the Transient Physics of Asymmetric Flow in a Double-suction Centrifugal Fan [PDF]

Journal of Applied Fluid Mechanics
The impeller of a double-suction centrifugal fan may be subject to axial offset due to assembly or operational failure. The internal flow is asymmetric about the central disc and deteriorates the fan’s performance.
R. Liu, H. Yang, Y. Wei, W. Zhang
doaj   +1 more source

Influence of flow pattern on leakage acoustic signal of multiphase pipeline

You-qi chuyun, 2021
In order to solve the problem that it is difficult to apply the existing leakage detection mechanism of singlephase pipelines with no consideration to the influence of flow patterns to the multiphase pipelines, the theoretical study and test analysis ...
Yi WANG, Junfei LI, Baoqiang JI, Jian JI
doaj   +1 more source

Investigation on leakage detection and localization in gas-liquid stratified flow pipelines based on acoustic method

Journal of Pipeline Science and Engineering, 2022
Leakage detection technology is of vital importance to the safe operation and flow insurance of multiphase flow pipelines. This paper for the first time applies acoustic based leakage detection method to stratified flow pipelines and verifies the ...
Xuejie Li, Yuan Xue, Huimin Du, Linjing Yue, Rui Ding, Cuiwei Liu, Yuxing Li   +6 more
doaj   +1 more source

Effect of internal leakage on torque converter characteristics

Advances in Mechanical Engineering, 2020
To understand the effect of internal leakage on the torque field and characteristics of a torque converter (TC), a transient analysis was performed on the internal flow of a TC and the pressure pulsation characteristics of monitoring points in the ...
Xiong Pan, Chen Xinyuan, Sun Hongjun, Zhong Jiping, Zhen Chenping   +4 more
doaj   +1 more source

Impact of Leakage Inlet Swirl Angle in a Rotor–Stator Cavity on Flow Pattern, Radial Pressure Distribution and Frictional Torque in a Wide Circumferential Reynolds Number Range

International Journal of Turbomachinery, Propulsion and Power, 2020
In the side-chambers of radial turbomachinery, which are rotor–stator cavities, complex flow patterns develop that contribute substantially to axial thrust on the shaft and frictional torque on the rotor.
Tilman Raphael Schröder, Hans-Josef Dohmen, Dieter Brillert, Friedrich-Karl Benra   +3 more
doaj   +1 more source

Flow-sensitive Leakage Analysis in Mobile Ambients

Electronic Notes in Theoretical Computer Science, 2005
AbstractIn this paper, we present a refinement of a Control Flow Analysis aimed at studying information flow security in the the calculus of Mobile Ambients. The improvements are achieved by making the analysis be flow-sensitive: the analysis is able to keep track of temporal dependencies of capabilities application when computing a safe approximation ...
C. BRAGHIN, CORTESI, Agostino
openaire   +3 more sources

A Review of Tip Clearance in Propeller, Pump and Turbine

Energies, 2018
Propellers, pumps, and turbines are widely applied in marine equipment, water systems, and hydropower stations. With the increasing demand for energy conservation and environmental protection, the high efficiency and the stable operation of pumps and ...
Yabin Liu, Lei Tan, Binbin Wang
doaj   +1 more source