نتایج جستجو برای: annular flow control valves
تعداد نتایج: 1766536 فیلتر نتایج به سال:
8 • Fluid Power Journal March/April 2003 The ability to achieve automated stepless control of pressure and flow rate in fluid power systems has undergone major development in the past twenty-five years. Electrohydraulic servo valves were invented in the late 1930s as a high tech, though high cost, solution to motion control needs. The mid-1980s saw the practical introduction of proportional val...
8 • Fluid Power Journal March/April 2003 The ability to achieve automated stepless control of pressure and flow rate in fluid power systems has undergone major development in the past twenty-five years. Electrohydraulic servo valves were invented in the late 1930s as a high tech, though high cost, solution to motion control needs. The mid-1980s saw the practical introduction of proportional val...
gas-lift pumps are devices for lifting liquid phase incorporating the gas phase to be injected in the bottom of liquid column. they are widely used in various industrial applications such as oil extracting in petroleum industries. gas-liquid flow being the main part of the flow through these systems, flowing in vertical pipes of gas-lift pumps has different regimes namely bubbly, slug, churn an...
Picoliter drops made in microfluidic devices can serve as individual compartments for chemical reactions and can be processed at kilohertz rates with high precision. This combination of speed and containment is very useful for highthroughput screening, for discovering novel drugs, for sorting analytes and worms, and for directed evolution of enzymes and cells. For applications in microfluidics,...
Stability control of the convection flow field has always been a focal issue. The annular discussed in this work is typical research model microgravity fluid physics, which extracted from industrial crystal growth by Czochralski method. It believed that instability thermal key factor affecting quality growth. Combining reinforcement learning algorithm with neural network, paper proposes policy ...
Gas-lift pumps are devices for lifting liquid phase incorporating the gas phase to be injected in the bottom of liquid column. They are widely used in various industrial applications such as oil extracting in petroleum industries. Gas-liquid flow being the main part of the flow through these systems, flowing in vertical pipes of gas-lift pumps has different regimes namely bubbly, slug, chur...
intelligent wells provide the ability for monitoring and control of downhole environment of the wells. downhole monitoring is achieved through sensors while control is realized with downhole valves. recovery from intelligent wells can be improved by proper selection of candidate wells/fields and optimizing the number, location and performance of the installed interval control valves. design cri...
Background: The CarboMedics Top-Hat aortic valve prosthesis was designed to be implanted in a supra-annular position. This study aimed compare the hemodynamic performance of prostheses versus standard prostheses.
 Methods: included 98 patients who had replacement and were divided into two groups. Group A 60 prostheses, B 38 prostheses. endpoints hospital outcomes, effective orifice area, p...
Active valves are most effective tools to control gas flow in compressors if fast transitions between the open mode and closed mode are needed. Unfortunately, an accurate model including several nonlinear effects and in particular the resistance and gas flow forces is not available, and this prevents the use of standard model based approaches for time optimal control. However, the repetitive na...
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