scholarly journals Experimental Investigation on the Performance of a Cavitating Venturi According to Upstream and Back Pressure Variation

2021 ◽  
Vol 25 (6) ◽  
pp. 12-19
Author(s):  
Hyun-Jong Ahn ◽  
Yun-Hyeong Kang ◽  
Jeong-Soo Kim
Keyword(s):  
Experimental Investigation ◽  
Pressure Variation ◽  
Back Pressure

The Performance of Air-Air Ejectors With Triangular Tabbed Driving Nozzles

2006 ◽  
Author(s):  
S. F. McBean ◽  
A. M. Birk
Keyword(s):  
Experimental Investigation ◽  
System Performance ◽  
Experimental Testing ◽  
Back Pressure ◽  
Tube Diameter ◽  
Performance Parameters ◽  
Mixing Performance ◽  
Performance Improvements ◽  
Significant Performance ◽  
Ejector System

This paper describes an experimental investigation into the effects of geometrical variations on ejector system performance when the driving nozzle includes delta mixing tabs. Mixing tabs have been shown to provide good mixing performance with comparable back-pressure penalties to other types of enhanced mixing nozzles. The performance parameters of most interest are pumping, mixing, and back-pressure. Geometric parameters studied include standoff distance, mixing-tube diameter, and tab angle. Experimental testing showed significant performance improvements in mixing and pumping with a decrease in tab angle. Maximum mixing was found to occur with tab angles positioned at 120°. Exceptional mixing was also observed with increased standoff. Back-pressure was shown to increase with increasing standoff and decreasing tab angle, but was not affected by mixing-tube diameter. In addition, a zone of recirculation was identified at the entrance to the mixing-tube. This zone is thought to have an influence on ejector performance.

Experimental Investigation of Spiral Wound Module Under Pressure Retarded Osmosis Process

2019 ◽  
Author(s):  
Luis Vives ◽  
Mostafa H. Elsharqawy ◽  
Edgar Quiñones-Bolaños
Keyword(s):  
Experimental Investigation ◽  
Membrane Surface ◽  
Back Pressure ◽  
Feed Water ◽  
Membrane Surface Area ◽  
Pressure Retarded Osmosis ◽  
Water Side ◽  
Density Values ◽  
Total Membrane ◽  
Spiral Wound

Abstract The performance of a spiral wound module operating under pressure retarded osmosis (PRO) is measured experimentally with a feed water back pressure. The module has a diameter of 0.1 m, a length of 1.02 m, and total membrane surface area of 7.45 m2 capsulated in a stainless-steel pressure vessel. The module is commercially designed for a reverse osmosis (RO) system however, a feed water outlet is added, and a back pressure is applied to adapt it for the PRO process. The experimental results of the spiral wound PRO module with a back pressure in the feed water side showed low power density values (about 0.35 W/m2) compared with those commonly found in the literature, demonstrating the geometric inefficiency of RO modules for the PRO process.

Experimental investigation on liquid permeability of tight rocks under back pressure conditions

2018 ◽  
Vol 169 ◽  
pp. 421-427 ◽  
Author(s):  
Jian Tian ◽  
Lijun You ◽  
Pingya Luo ◽  
Yili Kang ◽  
Dujie Zhang
Keyword(s):  
Experimental Investigation ◽  
Back Pressure ◽  
Liquid Permeability ◽  
Tight Rocks

scholarly journals EXPERIMENTAL INVESTIGATION OP SHOCK PRESSURES AGAINST BREAKWATERS

1968 ◽  
Vol 1 (11) ◽  
pp. 62 ◽  
Author(s):  
Gustaf Richert
Keyword(s):  
Experimental Investigation ◽  
Wave Front ◽  
Water Depth ◽  
Test Procedure ◽  
Breaking Waves ◽  
Pressure Variation ◽  
Shock Pressure ◽  
Compression And Expansion ◽  
Air Cushion ◽  
Special Respect

This paper describes an experimental investigation of shock pressures against breakwaters caused by "breaking waves. The study only considers shocks of a compressive type, which occur if the wave front is formed in such a way that an air cushion is entrapped between the wave and the wall. In this case the compression and expansion of the air cushion plays an important role m the pressure variation. Only waves preceded by non-breaking waves were used. For different combinations of bottom geometry and water depth the occurrence of shock pressures of different magnitudes was studied varying the wave height and the wave period. For some interesting combinations of bottom geometry and wave dimensions a series of tests were made to investigate the distribution over the wall of shock pressure and of shock impulse. The results, presented m diagrams and tables, have been commented on and analysed with special respect to the chosen test procedure.

Experimental Investigation of Pressure and Velocity on Chemical Mechanical Planarization

2000 ◽  
Author(s):  
Jhy-Cherng Tsai ◽  
Mingyi Tsai
Keyword(s):  
Experimental Investigation ◽  
Taguchi Method ◽  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Chemical Mechanical Planarization ◽  
Theoretical Models ◽  
Back Pressure ◽  
Wear Model ◽  
Polishing Pressure

Abstract Chemical-mechanical planarization or polishing (CMP) is an emerging process used in surface planarization and polishing for semiconducter wafer with multilevel interconnections. This paper investigates the effects of polishing pressure and velocity on the material removal rate (RR) and the non-uniformity (NU) in the CMP process. Wear models for CMP process from mechanical aspect, including abrasive-based model and flow-based model, are first discussed. Experiments using different polishing pressures, velocities, and back pressures are then designed and conducted based on the Taguchi method. Experimental results showed that RR and NU are consistent with theoretical models in a certain range. Both RR and NU increase as polishing speed increases. As RR and NU also increase with the polishing pressure at low pressure, their values become saturated and then decrease when the pressure exceeds certain value. It further verified that NU can be improved using proper back pressure as predicted by the flow-based wear model.

Analysis of Back Pressure Variation on Macroscopics Characteristics of Ethanol E100 Spray

2017 ◽  
Author(s):  
Victor Hugo de Castro Lima ◽  
Carlos Alberto Gomes Júnior ◽  
Márcio Expedito Guzzo ◽  
Thiago Rodrigo Vieira da Silva ◽  
José Guilherme Coelho Baeta ◽  
...  
Keyword(s):  
Pressure Variation ◽  
Back Pressure
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