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Over time, numerous studies have been carried out for jet ejectors used in refrigeration systems for various industrial applications or in solar energy recovery. These ejectors use steam or water as a working fluid because the water has a low cost, chemical stability and is safe to use. Of course, depending on the application of these ejectors in t...
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Owing to the human comfort, the utilization of refrigeration system has increased nowadays. In today’s scenario, the air conditioning system has led to the innovative changes in the lifestyle of human beings. The Heat driven ejector refrigeration machine is a favorable alternative to a compression based refrigeration system for the point of view of...
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... The function of a centrifugal pump is to pass the fluid through the eductor at high pressure. Eductors are used to lift, pump, mix, and agitate liquids, granular solids, and slurries (Kitrattana et al., 2017;Olaru, 2021). They are sometimes called aspirators, Venturi pumps, or jet pump ejectors. ...
The current research article presents the experimental investigation to comprehend the critical suction height and the region influenced by flow around particles during the hydraulic collection of polymetallic nodules (PMNs). The present investigation employed a water jet-eductor driven suction pipe to collect PMNs from the deep sea bed. Rectangular water tanks were utilized to establish the continuous flow and critical suction height for the vertical initial movement of particles. This process accurately simulates the hydraulic collection characteristics of the particles in deep-sea mining (DSM) scenario. The impact of suction height was examined by altering the particle size fraction. As part of the experimental investigation, three distinct tests were carried out: (i) the single particle (SP) test, (ii) the cluster particle (CP) test, and (iii) the area influence (AI) test. The suction pipes of diameters 70 mm and 80 mm were used to collect solid particles of sizes varying between 20 mm and 30 mm. Within the suction pipes, two distinct average flow velocities were maintained; 2.7 m/s and 1.6 m/s. The outcomes of these tests contribute to determining the critical height necessary for efficiently collecting the particles under varying conditions. Furthermore, the study gives us the idea of assessing the disturbance intensity at the seabed, to design a more effective hybrid-type nodule collection apparatus. In the single-particle test, the PMNs with masses ranging from 20 to 40 gm were successfully drawn in when the suction height was maintained between 75 mm and 80 mm. In area influence test, particles dispersed within a 150 mm diameter were effectively sucked in within the suction height range of 40-80 mm. And, the cluster influence test exhibited a suction height ranging between 70 mm and 80 mm.
