Results 31 to 40 of about 116 (106)

Monomer conversion, dimensional stability, strength, modulus, surface apatite precipitation and wear of novel, reactive calcium phosphate and polylysine-containing dental composites. [PDF]

PLoS ONE, 2017
The aim was to assess monomer conversion, dimensional stability, flexural strength / modulus, surface apatite precipitation and wear of mono / tri calcium phosphate (CaP) and polylysine (PLS)-containing dental composites.
Kanokrat Kangwankai, Sarah Sani, Piyaphong Panpisut, Wendy Xia, Paul Ashley, Haralampos Petridis, Anne Margaret Young   +6 more
doaj   +1 more source

Advanced Computational Investigation of Brush Seal Thermo-Fluid–Mechanical Performance Through Novel Porous Media Coefficient Derivation

Computation
Brush seals represent the most effective sealing technology, offering 5 to 10 times lower leakage flow rates, resulting in an 80% to 90% increase in sealing efficiency.
Altyib Abdallah Mahmoud Ahmed, Juan Wang, Meihong Liu, Aboubaker I. B. Idriss, Abdelgalal O. I. Abaker   +4 more
doaj   +1 more source

Analysis of Brush Seal Interaction with Steam Turbine Rotor-Shafts

Science, Engineering and Technology
High-speed turbines are a major source for power production. They utilize high pressure and temperature fluid flow. Sealing of these machines to decrease the flow losses has been a major engineering challenge since the inception of steam turbines.
Nonso Omenife, Dawood Desai, Regan Dunne
doaj   +1 more source

Experimental Study on Factors Affecting Waterproof Failure of Shield Tail Sealing System

Chengshi guidao jiaotong yanjiu
［Objective］ Shield tail seal failure is a high risk factor in shield construction process, and shield tail sealing performance seriously affects construction safety and construction schedule.
JIANG Peifeng
doaj   +1 more source

Microleakage of Pit and Fissure Sealants after Using Different Occlusal Surface Preparation Techniques: An In Vitro Study

Journal of Baghdad College of Dentistry, 2016
Background: The marginal seal is essential for sealant success because penetration of bacteria under the sealant might allow caries onset or progression. The aim of the present study was to estimate and compare the microleakage of pit and fissure sealant
Nibal Mohammed Hoobi
doaj   +1 more source

Leakage Flow Characteristics of Novel Two-Stage Brush Seal with Pressure-Equalizing Hole

Lubricants
Uneven inter-stage pressure drops of the common two-stage brush seal (CBS) lead to a problem that the second stage bristles bear excessive pressure load, and this problem leads to the premature failure of the brush seal.
Yu Li, Huanze Xu, Jinghan Zhang, Dan Sun, Zemin Yang   +4 more
doaj   +1 more source

Brush Seal Performance with Ideal Gas Working Fluid under Static Rotor Condition

Machines
The study investigated how variations in pressure ratio affect the leakage flow of a brush seal for both contact and clearance structures, in which the clearance is measured as the distance between the bristles tip and the rotor surface.
Altyib Abdallah Mahmoud Ahmed, Meihong Liu, Yuchi Kang, Juan Wang, Aboubaker I. B. Idriss, Nguyen Thi Trung Tin   +5 more
doaj   +1 more source

Analysis of Brush Seal Performance in Cantilever Beam Models Based on Instantaneous Friction Coefficient Correction

Aerospace
Brush seals, as a fundamental dynamic sealing technology in the aerospace and energy propulsion industries, require performance enhancement through instantaneous adjustment of the friction coefficient and force analysis of brush filaments.
Guiye Wen, Meihong Liu, Junjie Lei
doaj   +1 more source

Oil Temperature Analysis of Brush Seals

ASME/STLE 2007 International Joint Tribology Conference, Parts A and B, 2007
Due to their superior performance and stable leakage characteristics, brush seals are one of the dynamic seals used in oil and oil mist applications in aero-engines and turbines. The viscous medium between the high speed rotor surface and brush seal bristles generates a hydrodynamic lifting force that determines seal clearance and leakage rate in oil ...
Duran, Ertuğrul Tolga, Aksit, Mahmut Faruk, Doğu, Yahya   +2 more
openaire   +2 more sources

Prediction of Leakage Flow Rate and Blow-Down in Brush Seals via 2D CFD Simulation with Porosity Correction

Applied Sciences
Brush seals are extensively used in rotating equipment, such as gas turbines and compressors, providing effective sealing while accommodating radial, axial, and angular movements between components.
Jeong Woo Kwon, Joon Ahn
doaj   +1 more source