A New Approach for the Modelization of Water and Steam Mixing at High Pressure Conditions

Schio, Eugenia Rossi di; Pulvirenti, Beatrice; Celli, Michele

doi:10.1016/j.egypro.2016.11.005

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…Schio et al [86], presented a zero-dimensional mixing model of liquid wa Despite having a simple structure, two-phase mixing and condensation is a complex phenomenon to describe as this includes mechanical and thermodynamics in-equilibrium, heat transfer between fluids and fluid flow properties. The developed model has good convergence for injectors of motive steam, which expands in the steam nozzle to a sub-or supercritical velocity.…”

Section: Flow In Ejectorsmentioning

confidence: 99%

“…The model can predict outlet conditions based on inlet inputs. Schio et al [86], presented a zero-dimensional mixing model of liquid water and steam, based on thermodynamics analytical study compared with experimental results, relating to time dependency of experimental pressure and theoretical internal energy. Fuchs et al [87] studied water jet flow in a vacuum, for dumping excess water in a space lab cabin into space.…”

Section: Flow In Ejectorsmentioning

confidence: 99%

“…Schio et al [86], presented a zero-dimensional mixing model of liquid wa steam, based on thermodynamics analytical study compared with experimental relating to time dependency of experimental pressure and theoretical internal Fuchs et al [87] studied water jet flow in a vacuum, for dumping excess water in lab cabin into space. Primarily, the differences for decomposition in atmosphere uum were suggested.…”

Section: Flow In Ejectorsmentioning

confidence: 99%

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A Review on Process and Practices in Operation and Design Modification of Ejectors

Koirala

Zhu

et al. 2021

Fluids

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This work reviews the current operational condition and activities on design modification for different applications of ejectors. Ejectors being a simple mechanical system capable of performing multiple fluid related functions (vacuum generation, pumping, mixing, condensing and heat exchanging), have been an essential part of several industrial processes. Two areas have been emphasized; internal flow and application-based modifications in components of ejectors. The geometry and inlet flow conditions were found to be the prime influencing factor of its performance. The objective and application-based modifications were performed on the primary nozzle, secondary nozzle, mixing chamber, throat and diffuser. The resultant performance was found to be dependent on operational condition and fluid type. This emphasizes the requirement of application-based design selection of the technology. In addition, the flow dynamics of condensing, non-condensing, particle and slurry flow has been studied based on available literatures. The one-point final objective is to identify the usability of primary water jet ejectors for active vapor transport and condensation, to replace vacuum pump and condenser in compact domestic water desalination system.

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Section: Flow In Ejectorsmentioning

confidence: 99%

Section: Flow In Ejectorsmentioning

confidence: 99%

Section: Flow In Ejectorsmentioning

confidence: 99%

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A Review on Process and Practices in Operation and Design Modification of Ejectors

Koirala

Zhu

et al. 2021

Fluids

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Distributing PID controllers applied in water-mixing process

Rudati

Feriyonika

Sudarsa

et al. 2020

IOP Conf. Ser.: Mater. Sci. Eng.

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In a process control system influenced by several parameters, which are usually located and separated in a large area, the one-central controller is not effective anymore. It is computationally hard for the controller hardware to do many tasks at the same time, therefore, they are considered to distribute in Local Control Units (LCUs). This research investigates the distributed PID controllers in the water-mixing process. The main controlled variables (SVG) are the level and temperature influenced by three parameters (flow-in of cold water, flow-in of hot water, and flow-out of the main tank), which are then distributed to LCU-1 to LCU-3. To maintain the SVG, the master controller is then designed based on the difference between SVG and feedback of the main-tank (PVG) so that it will deliver SV for each LCU. The results show that with control parameters in LCU-1 (Kp, Ti, Td are 2, 10, 0.46, respectively), LCU-2 (Kp, Ti, Td are 8, 6, 0.6), and LCU-3 (Kp, Ti, Td are 3, 70, 20), the response of water temperature (measured based on settling-time [Ts], % overshoot [OS], and rise-time [Tr]) are 42s, 0%, 45.3s. In the water level control, the response can be maintained with the 60s, 0%, 62s, for Ts, %OS, Tr, respectively.

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A New Approach for the Modelization of Water and Steam Mixing at High Pressure Conditions

Cited by 2 publications

References 3 publications

A Review on Process and Practices in Operation and Design Modification of Ejectors

A Review on Process and Practices in Operation and Design Modification of Ejectors

Distributing PID controllers applied in water-mixing process

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