Experimental investigation of liquid-vapor ejector with conical mixing chamber

Sharapov, Sergii; Arsenyev, Vyacheslav; Козін, Віктор Миколайович

doi:10.15587/2312-8372.2016.75345

Cited by 5 publications

(2 citation statements)

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“…The initial data for numerical modeling and experimental research were chosen for the operation of a vacuum unit as part of a plant's vacuum cooling system for biodiesel fuel production [21,22].…”

Section: Initial Data and Design Schemesmentioning

confidence: 99%

Vapor Overproduction Condition Monitoring in a Liquid–Vapor Ejector

et al. 2022

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We consider the influence of vapor content in the mixed flow leaving a liquid-vapor ejector on the energy efficiency of a vacuum unit. As shown by numerical studies of liquid-vapor ejectors, this issue is important as vapor overproduction, which accompanies the process of secondary flow ejection, directly impacts the efficiency of the working process of both the liquid-vapor ejector and the vacuum unit as a whole. The greater the degree of vapor overproduction, the greater the load on the vapor phase of the separator, which is part of the vacuum unit. In addition, the liquid phase must be returned to the cycle to ensure the constancy of the mass flow rate of the working fluid of the primary flow. Our numerical study results revealed the rational value of the degree of vapor overproduction at which the efficiency of the liquid–vapor ejector was maximized, and the amount of additional working fluid that needed to enter the cycle of the vacuum unit was minimal. Experimental condition monitoring studies on the liquid–vapor ejector were carried out on plane-parallel transparent models with different flow path geometries. Through experimental studies, we confirmed and adjusted the values of the achievable efficiency of the working process of a liquid–vapor ejector, depending on the degree of vapor overproduction. Using a comparative analysis of liquid–vapor ejectors with different flow path geometries, differences were revealed in their working processes, which consisted of the degree of completion of the mixing of the working media of primary and secondary flows. To determine the feasibility of using liquid–vapor ejectors with different flow path geometries, exergy analysis was performed, resulting in achievable efficiency indicators.

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Section: Initial Data and Design Schemesmentioning

confidence: 99%

Vapor Overproduction Condition Monitoring in a Liquid–Vapor Ejector

et al. 2022

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“…The authors have successfully conducted theoretical and experimental studies and modeling the working process of the liquid-vapor ejector in the ANSYS CFX software package on different operating parameters of the pumped passive flow and various structural designs with the definition of achievable indicators of its efficiency [2][3][4], which are significantly higher than in similar steam.…”

Section: Literature Reviewmentioning

confidence: 99%

Improvement of the Vacuum Cooling System for Biodiesel Production

Sharapov¹,

Starchenko²,

Protsenko³

et al. 2019

JES

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The article deals with the actual problem of improving the vacuum cooling efficiency systems during the biodiesel production by using vacuum devices account for the liquid-vapor ejector, which operates on the principle of jet thermal compression. The purpose of this study is the feasibility of using vacuum devices, that based on the liquid-vapor ejector, and takes as a basis the principle of jet thermal compression in vacuum cooling systems of biodiesel production units. This article describes the basic scheme of the cooling system devices during the biodiesel production, which includes a three-stage steam-jet ejector and the proposed scheme based on the liquid-vapor ejector. A comparative analysis of the vacuum cooling systems during biodiesel production units was realized, where the schemes were compared on the basis of existent three-stage steam-jet ejectors and a new single-stage vacuum unit based on a liquid-vapor ejector. An exergy method of assessing the effectiveness of the proposed equipment was used as a comparison, because in the working process there is a transformation of two energy types: electric for the pump drive and heat for heating the working fluid of the active flow in the exchanger-heater. The intermediate pressure between the liquid-vapor ejector and the liquid-ring vacuum pump can help to achieve the highest characteristics of the new technology on the optimization parameters.

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