liquid flows
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2022 ◽  
Vol 6 (1) ◽  
pp. 3
Author(s):  
Saret Bun ◽  
Penghour Hong ◽  
Nattawin Chawaloesphosiya ◽  
Sreynich Pang ◽  
Sreyla Vet ◽  
...  

The present work focused on the development and evaluation of a compact electrocoagulation (EC) reactor, combined between EC and clarifier processes in continuous modes for decolorization and turbidity removal, named the integrated electrocoagulation-sedimentation reactor (IECS). The experiments were firstly conducted in the four-liter batch column in order to optimize the EC configuration and operation condition. The removal kinetics were also investigated and predicted for kinetic correlations. After various optimization steps, the IECS reactor was conducted, consisting of EC and clarifier compartments. Liquid flow pattern in EC compartment was examined through resident time distribution technique for defining the number of EC units and divided baffles. In summary, four units of EC were placed in the EC compartment of the IECS reactor with 90% in the width of three baffles. Each EC unit had two pairs of aluminum electrode plats in monopolar arrangement with a 1.5 cm gap and required a current density of 13.5 mA/cm2. For the clarifier compartment, it was mainly designed based on the batch settling test for separating the precipitated particles. The treatment performance of the IECS reactor was tested at different liquid flows in order to reduce the pollutant to a certain level. For the individual condition, liquid flow rates of 3 and 1 L/min were defined for turbidity and color, respectively. If both pollutants are presented simultaneously, a liquid flow rate of 1–2 L/min can be used for decreasing turbidity from 250 to <20 NTU and color from 6000 to <300 ADMI.


2022 ◽  
Vol 74 ◽  
pp. 104637
Author(s):  
Mathieu Calero ◽  
Holger Grosshans ◽  
Miltiadis V. Papalexandris

2021 ◽  
Vol 130 (24) ◽  
pp. 243303
Author(s):  
Toshiyuki Kawasaki ◽  
Masahiro Kamasaki ◽  
Nozomi Takeuchi ◽  
Fumiaki Mitsugi

Author(s):  
П.А. Вельмисов ◽  
А.В. Анкилов ◽  
Г.А. Анкилов

ва подхода к решению аэрогидродинамической части задачи, основанные на методах теории функций комплексного переменного и методе Фурье. В результате применения каждого подхода решение исходной задачи сведено к исследованию дифференциального уравнения с частными производными для деформации элемента, позволяющего изучать его динамику. На основе метода Галеркина произведены численные эксперименты для конкретных примеров механической системы, подтверждающие идентичность решений, найденных для каждого дифференциального уравнения с частными производными. The dynamics of an elastic element of a vibration device, simulated by a channel, inside which a stream of a liquid flows, is investigated. Two approaches to solving the aerohydrodynamic part of the problem, based on the methods of the theory of functions of a complex variable and the Fourier method, are given. As a result of applying each approach, the solution to the original problem is reduced to the study of a partial differential equation for the deformation of an element, which makes it possible to study its dynamics. Based on the Galerkin method, the numerical experiments were carried out for specific examples of mechanical system, confirming the identity of the solutions found for each partial differential equation.


2021 ◽  
pp. 76-89
Author(s):  
V. A. Ogai ◽  
N. G. Musakaev ◽  
A. Yu. Yushkov ◽  
V. O. Dovbysh ◽  
M. A. Vasilev

The issue of operation water-cut and "self-kills" wells is one of major aspects in gas production. One of the methods of solving this problem is the introduction of foaming agent into the well. The effectiveness of these technologies requires a theoretical and experimental study of gas-liquid flow with surfactants. We have analyzed existing works and have found out that experimental research in this area was carried out at atmospheric pressure. At the same time, the pressure in the well varies with the length of the wellbore and can affect the properties of foaming agent. The article presents a description of a facility for the study of gas-liquid flows with foaming agents at different pressure values. A method of conducting experiments on the facility, simulating a section of the production tubing of a vertical gas well, has been developed. The relations allowing calculating the volume contents of the phases in the gas-liquid flow with surfactants are proposed.


Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8153
Author(s):  
Myoung-Ock Cho ◽  
Woojin Jang ◽  
Si-Hyung Lim

Based on the results of computational fluid dynamics simulations, this study designed and fabricated a flexible thermal-type micro flow sensor comprising one microheater and two thermistors using a micro-electromechanical system (MEMS) process on a flexible polyimide film. The thermistors were connected to a Wheatstone bridge circuit, and the resistance difference between the thermistors resulting from the generation of a flow was converted into an output voltage signal using LabVIEW software. A mini tube flow test was conducted to demonstrate the sensor’s detection of fluid velocity in gas and liquid flows. A good correlation was found between the experimental results and the simulation data. However, the results for the gas and liquid flows differed in that for gas, the output voltage increased with the fluid’s velocity and decreased against the liquid’s flow velocity. This study’s MEMS-based flexible microthermal flow sensor achieved a resolution of 1.1 cm/s in a liquid flow and 0.64 cm/s in a gas flow, respectively, within a fluid flow velocity range of 0–40 cm/s. The sensor is suitable for many applications; however, with some adaptations to its electrical packaging, it will be particularly suitable for detecting biosignals in healthcare applications, including measuring respiration and body fluids.


2021 ◽  
Vol 92 ◽  
pp. 108878
Author(s):  
Avick Sinha ◽  
Andrey Cherdantsev ◽  
Kathy Johnson ◽  
Joao Vasques ◽  
David Hann
Keyword(s):  

2021 ◽  
Vol 939 (1) ◽  
pp. 012033
Author(s):  
A Lee ◽  
B Utepov ◽  
E Kan ◽  
O Kuychiev

Abstract This article presents the theoretical background for the justification of the parameters of the rotating sprayer. Theoretical studies show that an increase in the rotation frequency of the disk at a constant air flow velocity leads to a minimum median mass diameter of the droplets. Therefore, when justifying the diameter of the sprayed droplets, it is necessary to consider the combination of the disk rotation speed and the axial velocity of the air flow. To obtain high-quality air-droplet flow, the initial speed of the main droplets discharged from the periphery of the spray disc should be less than the air velocity and rotational frequency Pavlovskyi spray is recommended to be applied with in ω=60… 200 c1.


Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3382
Author(s):  
Maksim A. Pakhomov ◽  
Pavel D. Lobanov

This Special Issue contributes to highlight and discusses topics related to various aspects of the two-phase gas-liquid flows [...]


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