Bubble dynamic behaviour of air–water two-phase flow mixing in hydraulic structures

Environmental Quality Mgmt

Logesh

et al. 2023

The objective of this present study is to examine the effect of nanobubbles on the physical properties improvement in the chosen water sample. So far, the research outcomes stated that the physical properties could be enhanced by addition of nanoparticles, but very few studies were performed with nanobubbles. The unique properties of nanobubbles (70–120 nanometers) explain their use in a wide range of engineering fields. Simple method for producing nanobubbles in a variety of aqueous solutions along with examples of their use is outlined in this work. Global environmental issues, including the deterioration and depletion of water supply are driving today's need for water treatment technology. As a solution, the use of micro‐ and nano‐bubble (MNB) technologies in wastewater treatment has evolved. This page discuss the fundamentals of water treatment research, including their stability of bubbles, manufacturing processes, and chemical and physical features.

Section: Mnb Generation Processmentioning

confidence: 99%

Section: Aeration Is the Introduction Of Oxygen To A Liquid By Means ...mentioning

confidence: 99%

Investigation on physical properties of nanobubbled water using gas water circulation method: Environmental perspective

Joy

Environmental Quality Mgmt

Logesh

et al. 2023

“…Numerous statistics and findings on HOPG from various investigations are available in the literature (Binning et al., 1982). The study of these surfaces is especially pertinent due to the fact that water on graphite is comparable to water on and within carbon nanotubes (CNT) (Senthilkumar & Sankar, 2018). Last but not least, it is discovered that water contacts the HOPG surface at an angle of around 900, placing it between the hydrophilic and hydrophobic substrates (Christenson & Claesson, 2001).…”

Section: Introductionmentioning

confidence: 99%

Review on nanobubbles behavior with hydrophobic and hydrophilic surfaces

Environmental Quality Mgmt

Musharraf

Deepak

2023

The objective of the present study is to review the behavior of nanobubbles with hydrophobic and hydrophilic surfaces. In most of the situations, it is desirable that the water particles adhere to the surface, called hydrophilic surface and in some cases, the water particles move away from the surface, called hydrophobic surfaces. Nanobubbles owing to their extraordinary physio‐chemical properties find their application in waste water treatment, aquaculture, cultivation of yeast, oil refineries and agriculture, etc. This review article addresses the unpredictable behavior of nanobubbles with different surfaces according to previous studies and the various procedures to confirm the existence of such bubbles on those surfaces.

“…Senthilkumar et al investigated the influence of stream equalizer plates at the upstream water side on the flow uniformity in open channel flow passages [12]. Senthilkumar et al outlined the impact of spillway weir design on the air entrainment on water in hydraulic structures [13,14]. e experiment on the spillway weir optimization for minimization of entrainment of air and bulk air bubbles in water at different fall heights of water over the weir profile on the downstream side of flow passage was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Material Behaviour on Flow Uniformity over Different Spillway Weir Profiles

Singh

Advances in Materials Science and Engineering

Mulugeta

2022

Self Cite

The spillway weir system finds an important application to achieve uniform flow in the open canal stream passages, for irrigation and in many industrial processes, majorly including cooling of reactor components with liquid sodium in prototype fast breeder reactors, process plants, and power industries. The optimal design of weir profile and the velocity of flow over the weir are the critical factors that need to be optimized to minimize flow separation in order to avoid entrainment of gas in flowing liquid, and also, the nonuniform cooling resulted in uneven temperature distributions in many thermohydraulic structures. In this research, the spillway weir profile made from SS-316, SS-304, concrete, and teak wood is compared for optimization of flow uniformity by means of hydraulic experiments conducted on the water-air model and also to investigate the behavior of flow past over the rectangular weir of three different radii 6 mm, 6.47 mm, and 7 mm, respectively, and the minimum of 1.2% flow separation was observed with 6.74 mm profile, and also, the computational fluid dynamics (CFD) based numerical simulation was performed in the fluid domain to validate the experimental data to attain the flow uniformity when flow past over the spillway weir profile and the results are highlighted. The experimental results on air entrapment, water film thickness, and velocity of water over the weir profile on the perspective of uniformity of flow are also discussed in detail.