Results 111 to 120 of about 169 (151)
Micellar and Solubilization Properties of Biological Surfactant Surfactin
Journal of Surfactants and Detergents, EarlyView.ABSTRACT We studied aqueous solutions of surfactin in the concentration range of 0.001–200 g/L using NMR diffusometry, tensometry and optical microscopy methods. According to tensometry data, the system forms monolayers of surfactant molecules at the water‐air phase boundary at C = 0.02 g/L.
Victor P. Arkhipov +3 more
wiley +1 more source
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Air Foil Thrust and Journal Bearing Coatings: A Review
Journal of TribologyAbstract Surfaces of air foil thrust and journal bearings in high-speed turbomachinery are coated to improve their operational integrity, particularly when the aerodynamic load-carrying capacity is reduced during instances of startup and shutdown.
Rahmani Ramin, Rahnejat Homer
exaly +2 more sources
Tribology Transactions, 2011
A three-dimensional (3D) thermohydrodynamic (THD) model for air foil thrust bearings (AFTBs) is presented. The nonisothermal Reynolds equation is solved using pressure boundary conditions at the cooling air plenum considering local temperature-dependent viscosity and density.
Donghyun Lee, Daejong Kim
exaly +2 more sources
A three-dimensional (3D) thermohydrodynamic (THD) model for air foil thrust bearings (AFTBs) is presented. The nonisothermal Reynolds equation is solved using pressure boundary conditions at the cooling air plenum considering local temperature-dependent viscosity and density.
Donghyun Lee, Daejong Kim
exaly +2 more sources
Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments
Tribology Transactions, 2011Thrust air foil bearings are critical components in high-efficiency turbomachinery, such as two-stage compressors subjected to large and irregular axial forces. In this article, a model of thrust bump foil bearings that predicts deflection with variable axial load is developed assuming no tilting effect of the thrust collar.
Tae Young Kim, Tae Ho Kim, Yong-Bok Lee
exaly +2 more sources
Archive of Applied Mechanics, 2018
The performance of air foil thrust bearings (AFTBs) is studied for aligned, distorted and misaligned operating conditions on the basis of a very detailed numerical model for the foil sandwich. The exact geometry of the bump foil is modeled by a Reissner–Mindlin-type shell theory.
Schweizer Bernhard, Bernhard Schweizer
exaly +3 more sources
The performance of air foil thrust bearings (AFTBs) is studied for aligned, distorted and misaligned operating conditions on the basis of a very detailed numerical model for the foil sandwich. The exact geometry of the bump foil is modeled by a Reissner–Mindlin-type shell theory.
Schweizer Bernhard, Bernhard Schweizer
exaly +3 more sources
Tribology International, 2008
The thrust pad of the rotor is used to sustain the axial force generated due to the pressure difference between the compressor and turbine sides of turbomachinery such as gas turbines, compressors, and turbochargers. Furthermore, this thrust pad has a role to maintain and determines the attitude of the rotor.
Chang-Ho Kim, Yong-Bok Lee
exaly +2 more sources
The thrust pad of the rotor is used to sustain the axial force generated due to the pressure difference between the compressor and turbine sides of turbomachinery such as gas turbines, compressors, and turbochargers. Furthermore, this thrust pad has a role to maintain and determines the attitude of the rotor.
Chang-Ho Kim, Yong-Bok Lee
exaly +2 more sources
Air foil thrust bearings with top foil sagging: Theoretical predictions and experiments
Tribology International, 2023Fangcheng Xu
exaly +2 more sources
Surrogate Model Development for Air Foil Thrust Bearings With Chevron-Patterned Trailing Edge
Journal of TribologyAbstract Air foil thrust bearings provide some advantages over oil-lubricated thrust bearings. The use of these bearings reduces weight and increases dynamic stability, making it possible to reach high rotational speeds. However, as the bearing reaches high rotational speeds, the higher amount of heat generated results in reduced ...
Alexandrina Untaroiu +1 more
exaly +3 more sources