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Valmet Oyj, a Finnish company, is a developer and supplier of process technologies, automation systems and services for the pulp, paper, energy industries. Flow control serves a wider base of process industries.
A flow control structure is a device that alters the flow of water in a stream, drainage channel or pipe. As a group these are passive structures since they operate without intervention under different amounts of water flow and their impact changes based on the quantity of water available.
Active control requires actuators that require energy and may operate in a time-dependent manner. [1] Active flow control includes steady or unsteady suction or blowing, [2] the use of synthetic jets, valves and plasma actuators. Actuation may be pre-determined (open-loop control) or be dependent on monitoring sensors (closed-loop control).
The most common final control element in the process control industries is the control valve. The control valve manipulates a flowing fluid, such as gas, steam, water, or chemical compounds, to compensate for the load disturbance and keep the regulated process variable as close as possible to the desired set point. [1]
Variable flow systems require new calculations, new terminology and, most importantly, new technology. The aim when sizing control valves is to find the perfect valve solution for the system. [citation needed] Finding that perfect valve involves understanding the hydronics of the project and recognizing the importance of perfect control flow.
[5] [6] Valmet announced that it will not support Alfa Laval's takeover bid in July 2020 [7] and increased its holdings in Neles in August 2020. [8] Alfa Laval launched a public cash tender offer for all Neles shares on 13 August 2020. [9] Valmet and Neles announced on 2 July 2021 that the Boards of Directors of Valmet and Neles have agreed to ...
It is recommended to name the SVG file “Bedforms under various flow regimes.svg”—then the template Vector version available (or Vva) does not need the new image name parameter. Summary Description Bedforms under various flow regimes.pdf
The present research of plasma actuators is mainly focused on three directions: (1) various designs of plasma actuators; (2) flow control applications; and (3) control-oriented modeling of flow applications under plasma actuation. In addition, new experimental and numerical methods [26] are being developed to provide physical insights.