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

Abstract

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.

Application of the Moment Method for Numerical Simulation of Homogeneous-Heterogeneous Condensation

“…Using the developed algorithm, the numerical simulation of gas-dynamic flows with phase transitions in an ejector device for cleaning smoky gases is carried out. An overview of various ways of using ejectors is given in [45]. The geometry of the calculated device consists of two coaxially located conical nozzles, as shown in Figure 10.…”

Solving Innovative Problems of Thrust Vector Control Based on Euler's Scientific Legacy

“…Each of the noted sets has a limited number of parameters, which, to some extent, reflect the level of development of science and technology at a given point in time. (21) In general (when solving an optimization problem), the chosen optimization criterion 𝜂 𝑖 , or a set of similar criteria, depends functionally on the base sets (A, B, C, D):…”

“…Today, comprehensive studies focus on the relationship between the dimensional design parameters, the ones of the working body state, and the ejector performance [17][18][19]. Aidoun et al [20] and Koirala et al [21] proposed detailed reviews of recent numerical and experimental investigations of the ejector and its applications. Koirala et al [21] and Shank and Tiari [22] considered the current state of operation and measures to modify the design of ejectors for various applications.…”

“…Aidoun et al [20] and Koirala et al [21] proposed detailed reviews of recent numerical and experimental investigations of the ejector and its applications. Koirala et al [21] and Shank and Tiari [22] considered the current state of operation and measures to modify the design of ejectors for various applications. High-speed flows cover a wide range of modern directions of experimental and numerical studies, both in fundamental scientific problems of internal and external gas dynamics and in some new practical problems [23].…”

Economic Design of Pipe-Nozzle Discharge Lines Delivering Free Jets

“…In practice, pipe nozzles are widely used in many water and wastewater engineering applications, such as irrigation systems, water supply, and wastewater system arrangements Wright et al (2003), Poeck (2008). Common applications of nozzles in water and wastewater treatment systems are as follows: Koirala et al (2021), BETE for Nozzle Performance Engineering (2022):…”