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Search Results (3)

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Keywords = defoaming pump

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17 pages, 2544 KiB  
Review
Antifoaming Agent for Lubricating Oil: Preparation, Mechanism and Application
by Chenfei Ren, Xingxing Zhang, Ming Jia, Chenming Ma, Jiaxin Li, Miaomiao Shi and Yunyin Niu
Molecules 2023, 28(7), 3152; https://doi.org/10.3390/molecules28073152 - 31 Mar 2023
Cited by 9 | Viewed by 6307
Abstract
In the process of using lubricating oil, it is inevitable that bubbles will be produced, which can not only accelerate the oil’s oxidation and shorten the oil change cycle but also reduce its fluidity and lubricity, aggravate the wear of mechanical parts and [...] Read more.
In the process of using lubricating oil, it is inevitable that bubbles will be produced, which can not only accelerate the oil’s oxidation and shorten the oil change cycle but also reduce its fluidity and lubricity, aggravate the wear of mechanical parts and produce an air lock that interrupts the oil pump supply and causes an oil shortage accident. This paper mainly and comprehensively discusses the foaming process and its harm, the defoaming mechanism and defoaming method of lubricating oil, more specifically, the synthesis, application, advantages, disadvantages and current situation of three kinds of chemical defoaming agents, namely silicone defoaming agent, non-silicone defoaming agent and compound defoaming agent. Finally, the paper looks forward to the future development of special defoaming agents for lubricating oil. Full article
(This article belongs to the Special Issue Exclusive Feature Papers in Macromolecular Chemistry)
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13 pages, 5062 KiB  
Article
Novel Slow-Release Defoamers for Concrete Using Porous Nanoparticles as Carriers
by Guangcheng Shan, Min Qiao, Jian Chen, Nanxiao Gao, Fei Shen and Qianping Ran
Materials 2022, 15(22), 7993; https://doi.org/10.3390/ma15227993 - 12 Nov 2022
Cited by 4 | Viewed by 2174
Abstract
Excess large and unstable air bubbles can reduce the compressive strength of hardened concrete, and traditional defoamers always fail because of adsorption and encapsulation on cement with the progress of cement hydration in later stages. It is necessary to develop a novel defoamer [...] Read more.
Excess large and unstable air bubbles can reduce the compressive strength of hardened concrete, and traditional defoamers always fail because of adsorption and encapsulation on cement with the progress of cement hydration in later stages. It is necessary to develop a novel defoamer that shows a sustained defoaming ability in fresh concrete. A novel slow-release defoamer for concrete using porous nanoparticles as carriers is reported for the first time. The porous nanoparticles/polyether defoamer composite (SiO2-Def) was prepared via sol-gel method. SiO2-Def is a spherical composite nanoparticle with a size range of 160–200 nm and a uniform pore size distribution. SiO2-Def shows a high load rate of about 16.4% and an excellent release under an alkali and salt environment. It has a weak initial defoaming ability but shows a sustained defoaming ability with time, so that it can avoid the failures of defoamers and eliminate harmful bubbles entrained during the processes of pumping and transportation. Moreover, SiO2-Def produced a higher compressive strength of the hardened cement mortars. Full article
(This article belongs to the Topic Innovative Construction and Building Materials)
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14 pages, 6627 KiB  
Article
Bench Tests and CFD Simulations of Liquid–Gas Phase Separation Modeling with Simultaneous Liquid Transport and Mechanical Foam Destruction
by Paweł Tomtas, Amadeusz Skwiot, Elżbieta Sobiecka, Andrzej Obraniak, Katarzyna Ławińska and Tomasz P. Olejnik
Energies 2021, 14(6), 1740; https://doi.org/10.3390/en14061740 - 21 Mar 2021
Cited by 10 | Viewed by 3229
Abstract
This paper presents simulation and bench test results for a special type of centrifugal pump that enables the transport of dispersive foaming liquids and simultaneous separation of the liquid phase. During the design phase, CFD (Computer Fluid Dynamics) simulations were performed using Ansys [...] Read more.
This paper presents simulation and bench test results for a special type of centrifugal pump that enables the transport of dispersive foaming liquids and simultaneous separation of the liquid phase. During the design phase, CFD (Computer Fluid Dynamics) simulations were performed using Ansys Fluent. The simulations covered changing the operating parameters of the pump (mass/volume flow rate), pressure analysis for the first impeller, and structural optimization of the pump components. In the second stage of the research, the pump and a measuring station were constructed to validate the results of the numerical simulations. Full article
(This article belongs to the Special Issue Computational Thermal, Energy, and Environmental Engineering)
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