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Define air-entrained concrete. ... the capture of drier air. Several parameters are used to describe the performance of ejectors in cooling cycles, as provided below. Combine this scenario with locations where the general public or employees are routinely present or for a location where a fresh air intake is present and you might want to consider a re-entrainment evaluation. Interfacial aeration is defined as the air entrainment process along an air–water interface, usually parallel to the flow direction. Ro, Cookies help us deliver our services. Examples of localised aeration include air entrainment by plunging water jet and at hydraulic jump. Definition of entrainment in the Definitions.net dictionary. at this level of air entrainment. Delivered to your inbox! It is typically used to refer to the capture of a wind flow of high moisture content, or in the case of tropical cyclones, the capture of drier air.. Detrainment is the opposite effect, when the air from a convective cloud, usually at its top, is injected in the environment. Language: English. This increases the resistance of the concrete to freeze-thaw damage in cold climates.… Read More translation and definition "air entrainment", English-French Dictionary online. The web service Alexandria is granted from Memodata for the Ebay search. Das Substantiv (Hauptwort, Namenwort) dient zur Benennung von Menschen, Tieren, Sachen u. Ä. Physics concepts can go in one ear and out the other so we've added a few more definitions of it to help it sink in.  |  See more. By definition, entrainment is a form of the verb, entrain, which is fluid that is swept along into an existing moving flow. The grinding fluid must penetrate the air barrier; otherwise, it cannot enter the grinding contact. Learn more. Source: AIChE. Steel expands when it rusts, and these forces create even more cracks, letting in more water. Chemistry To carry (suspended particles, for example) along in a current or into the vapor phase. General (2 matching dictionaries) air entrainment: Merriam-Webster.com [home, info] Air entrainment: Wikipedia, the Free Encyclopedia [home, info] ○   Wildcard, crossword Bubbles are entrained locally at the intersection of the impinging jet with the surrounding waters. The benefits of smaller machinery are obvious: economy of materials, less energy consumption, less square-footage required. 2. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! springer. Bleeding, we know is the process in which water mortar emerges out on the concrete surface. The bubbles are introduced into the concrete by the addition to the mix of an air entraining agent, a surfactant (surface-active substance, a type of chemical that includes detergents). The entrainment ratio ω is the ratio between the secondary fluid mass flow rate ms, in kg/s, and the primary fluid mass flow rate mp, in kg/s: (7.11)ω = ms mp. (Cant. air-oxygen blenders definition. Venturi mask: [ ven-tu´re ] a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. Mean air content. It is typically used to refer to the capture of a wind flow of high moisture content, or in the case of tropical cyclones, the capture of drier air.. Detrainment is the opposite effect, when the air from a convective cloud, usually at its top, is injected in the environment. Air-entrained concrete is produced using air-entraining portland cement, or by the introduction of air-entraining agents, under careful engineering supervision, as the concrete is mixed on the job. Air entrainment Air entrainment is the intentional creation of tiny air bubbles in concrete. ), http://www.uq.edu.au/~e2hchans/reprints/book2.htm, "Turbulent Air-water Flows in Hydraulic Structures: Dynamic Similarity and Scale Effects", http://espace.library.uq.edu.au/view/UQ:171996, http://en.wikipedia.org/w/index.php?title=Air_entrainment&oldid=500051634. It is reported that, maximum flexural strength can be achieved even with air contant of 4%. Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. These are larger bubbles, and are typically less evenly distributed than entrained air. Air Entrainment in Steep Chute Flows. English Encyclopedia is licensed by Wikipedia (GNU). A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. These cracks allow more water into the concrete and the cracks enlarge. http://www.theaudiopedia.com What is AIR ENTRAINMENT? An admixture, usually a resin, soap, or grease, for portland cement or concrete to effect air entrainment and, thus, superior properties. The benefits of smaller machinery are obvious: economy of materials, less energy consumption, less square-footage required. … Skill Level: Basic. Find out more, Please help by adding an introductory section to this article. You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary. Air entrainment is the intentional creation of tiny air bubbles in concrete. Entrainment occurs most often through light exposure affecting the suprachiasmatic nucleus of the brain. Bernoulli's Priniciple or Effect has practical applications in the field of respiratory care in that it allows us to deliver precise oxygen concentration levels with simple devices by mixing oxygen with entrained room air. Change the target language to find translations. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984). The average pump will likely fail to operate at 14 percent air entrainment. Share This Post: 27/32 in the series Distillation in Practice. Presentation The process of air entrainment in high-velocity open channel flows was initially studied because of the effects of entrained air on the thickness of flowing water. Fluid or Air Entrainment. UL's Firefighter Safety Research Institute has conducted an extensive Air Entrainment Study to evaluate the influence of nozzles and their ability to influence the flow path during a fire. Definition of Air entrainment. Hubert Chanson M.E., ENSHM Grenoble, INSTN (Saclay), Ph.D. (See also oxygen therapy .) This equation is unique as it relates flow energy with kinetic energy and potential energy. The intersecting perimeter is a singularity in terms of both air entrainment and momentum exchange, and the air is entrapped at the discontinuity between the impinging jet flow and the receiving pool of water. entrained air indicator in English translation and definition "entrained air indicator", Dictionary English-English online . More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. The structural engineer will specify the proper air entrainment depending upon the use of the concrete, as well as the location of the project. Liquid is being recycled and carried to the tray above by the froth. [1] The entrainment of air packets can be localised or continuous along the air–water interface. 7.3.2 Performance Parameters. The failure of reinforced concrete is most often due to this cycle, which is accelerated by moisture reaching the reinforcing steel. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition… Upon awakening, morning sunlight can have a profound impact to begin the process of sustained wakefulness and end the period of sleep. Duration: 1 minute. ), Eur. What made you want to look up air entrainment? a mechanical device designed to proportion air and oxygen to specific concentration. The formula was mainly… Entrainment is a phenomenon of the atmosphere which occurs when a turbulent flow captures a non-turbulent flow. Ing., MIEAust., MIAHR, in Air Bubble Entrainment in Free-Surface Turbulent Shear Flows, 1996. It is reported that, maximum flexural strength can be achieved even with air contant of 4%. The air entrainment in a free surface mainly results from the development of small turbulent structures in the air-water free surface, which have the capacity to trap air carrying it to the core of the flow. Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. But one often-overlooked drawback is the increased probability of air entrainment for systems that incorporate smaller reservoirs. Which of the following refers to thin, bending ice, or to the act of running over such ice. Air entrainment is the intentional creation of tiny air bubbles in concrete. Test your knowledge - and maybe learn something along the way. Get XML access to fix the meaning of your metadata. All rights reserved. A basic definition of entrainment is the tendency for two oscillating bodies to lock into phase so that they vibrate in harmony. Air entrainment definition is - the incorporation in concrete or mortar of minute air bubbles (as by addition of soap or grease) to increase resilience and resistance to wear and weathering. air entrainment . Venturi mask: [ ven-tu´re ] a type of disposable face mask used to deliver a controlled oxygen concentration to a patient. Air entrainment is the insertion of air bubbles into concrete to create a more durable product that has less cracking and better wear capabilities. Each square carries a letter. Effect of Air Entrainment on Flexural Strength of Concrete Generally, the influence of air entrainment on flexural strength of concrete is not as detrimental as in the case of concrete compressive strength. n a low-density type of concrete throughout which small air bubbles are dispersed in order to increase its frost resistance: used for making roads. Entrainment is the mixing of environmental air into a preexisting air current or cloud so that the environmental air becomes part of the current or cloud. The air bubbles are typically 10 to 500 micrometres in diameter (0.0004 to 0.02 in) and are closely spaced. Entrain definition is - to draw along with or after oneself. Entrainment definition, the act or fact of trapping bubbles in a liquid:A notorious problem in some ink-jet printing systems is the entrainment of tiny air bubbles in the ink during operation. Air Entrainment Mechanisms from Artificial Supercavities: Insight based on numerical simulations Michael P. Kinzel Jules W. Lindau Robert F. Kunz Penn State University Applied Research Laboratory State College, PA, USA ABSTRACT Using multiphase computational simulations based on the Navier-Stokes equations, we examine the internal gaseous flows of artificially ventilated supercavities. trains 1. Look it up now! Look it up now! This needs to be taken into account when batching and mixing. Post the Definition of air entrainment to Facebook, Share the Definition of air entrainment on Twitter. Accessed 18 Jan. 2021. The flow of 100 per cent oxygen through the mask draws in a controlled amount of room air (21 per cent oxygen). As mentioned above, anytime an emissions source is located within the vicinity of structures there is the possibility of re-entrainment. It may not have been reviewed by professional editors (see full disclaimer). English thesaurus is mainly derived from The Integral Dictionary (TID). See more. The definition of a HGI in the International Plumbing Code (IPC) is, "Plumbing appurtenances that are installed in the sanitary drainage system to intercept free-floating fats, oils and grease from waste water discharge. Flooding and Entrainment in a Distillation Tray. You can also try the grid of 16 letters. Key words: stepped chute, air-entrainment, air-water flow properties, macro-roughness elements, skimming flow. In hydraulic engineering, air bubble entrainment is defined as the entrapment of air bubbles and pockets that are advected within the turbulent flow. See if you can get into the grid Hall of Fame ! Air entrainment is the insertion of air bubbles into concrete to create a more durable product that has less cracking and better wear capabilities. Further, the presence of air within the boundary layer reduces the shear stress between the flow layers and hence the shear force .Also it may prevent or reduce the damage caused by cavitation . Flooding occurs when the froth level reaches the tray above. [2], This entry is from Wikipedia, the leading user-contributed encyclopedia. Definition of Air Entrainment in Construction. Menschen, Tieren, Sachen u. Ä, bending ice, or 40 cent! ( Geschlechtswort ) und i. fluid or air escapes can air entrainment definition air entrainment, and... Terms of the atmosphere which occurs when a turbulent flow captures a non-turbulent.... English encyclopedia is licensed by Wikipedia ( GNU ) recycled and carried the... Flows, 1996 you want to look up air entrainment is the creation... 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