entrainment Bedeutung, Definition entrainment: 1. the process of making something part of a liquid or flow of something and carrying it along: 2…. A water:cement ratio (w/c) of approximately 0.25 (this means 25 parts water for every 100 parts cement) is required for all the cement particles to hydrate. Source: AIChE. But one often-overlooked drawback is the increased probability of air entrainment for systems that incorporate smaller reservoirs. 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 and concrete Some things every contractor should know about a combination that assures longer-lasting and more attractive concrete This photomicrograph of air entrained plastic concrete suggests how minute bubbles of air function as … With a SensagentBox, visitors to your site can access reliable information on over 5 million pages provided by Sensagent.com. 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). Tips: browse the semantic fields (see From ideas to words) in two languages to learn more. 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. [French entrainer, from Old French : en-, in; see en-1 + trainer, to drag; see train.] Entrapped air is considered to not make a positive contribution to durability and is undesirable though not entirely avoidable. http://www.theaudiopedia.com What is AIR ENTRAINMENT? Share This Post: 27/32 in the series Distillation in Practice. The air bubble entrainment may be localised or continuous along an interface (water jets, spillway chutes). ○   Wildcard, crossword To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares. English Encyclopedia is licensed by Wikipedia (GNU). Meaning of entrainment. 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. air entrainment meter: Luftporengehaltsprüfer {m} air-entrainment mask definition. See if you can get into the grid Hall of Fame ! The formula was mainly… In hydraulic structures, free-surface aeration is commonly observed: i.e., the white waters. Air-entraining cements are made by the addition on grinding of a small amount, about 0.05 percent, of an organic agent that causes the entrainment of very fine air bubbles in a concrete. The flow of 100 per cent oxygen through the mask draws in a controlled amount of room air (21 per cent oxygen). This evaluation is especially 2.  | Last modifications, Copyright © 2012 sensagent Corporation: Online Encyclopedia, Thesaurus, Dictionary definitions and more. Skill Level: Basic. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition, part of the paste (Dolch 1984). ○   Anagrams 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. 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. Entrain definition is - to draw along with or after oneself. (See also oxygen therapy .) 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. 7.3.2 Performance Parameters. This needs to be taken into account when batching and mixing. Get XML access to reach the best products. 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. Most English definitions are provided by WordNet . Give contextual explanation and translation from your sites ! Air entrainment — how it happens, how to avoid it. The air barrier is a sub-ambient low-pressure layer of fast-moving air as illustrated in Figure 8.3.  |  Test your knowledge - and maybe learn something along the way. at this level of air entrainment. 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. Giga-fren. Eventually the concrete spalls - chunks break off. 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. 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. Air entrained around a rotating wheel forms a barrier that impedes fluid delivery. In hydraulic engineering, air bubble entrainment is defined as the entrapment of air bubbles and pockets that are advected within the turbulent flow. Start your free trial today and get unlimited access to America's largest dictionary, with: “Air entrainment.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/air%20entrainment. An admixture, usually a resin, soap, or grease, for portland cement or concrete to effect air entrainment and, thus, superior properties. Das Substantiv Englische Grammatik. springer. Entrainment is a phenomenon of the atmosphere which occurs when a turbulent flow captures a non-turbulent flow. snow entrainment [esp. ○   Lettris Which of the following refers to thin, bending ice, or to the act of running over such ice. The English word games are: This increases the resistance of the concrete to freeze-thaw damage in cold climates.… Read More The air bubble can be compressed a little, and so the bubbles act to reduce or absorb stresses from freezing. Air entrainment — how it happens, how to avoid it. Other articles where Air-entraining cement is discussed: cement: Types of portland cement: Air-entraining cements are made by the addition on grinding of a small amount, about 0.05 percent, of an organic agent that causes the entrainment of very fine air bubbles in a concrete. In addition to entrained air, hardened concrete also contains entrapped air. 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. Whenever there is a discussion about fluid dynamics, the Bernoulli’s equation generally comes up. 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. We found 7 dictionaries with English definitions that include the word air entrainment: Click on the first link on a line below to go directly to a page where "air entrainment" is defined. Letters must be adjacent and longer words score better. Explanation of air-entraining agent entrained air indicator in English translation and definition "entrained air indicator", Dictionary English-English online . While hardened concrete appears solid, it is porous, having small capillaries resulting from the evaporation of water beyond that required for the hydration reaction. See more. These cracks allow more water into the concrete and the cracks enlarge. Look it up now! 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. English thesaurus is mainly derived from The Integral Dictionary (TID). More than 250,000 words that aren't in our free dictionary, Expanded definitions, etymologies, and usage notes. To pull or draw along after itself. (Cant. Fluid or Air Entrainment. ○   Boggle. Entrainment is a phenomenon of the atmosphere which occurs when a turbulent flow captures a non-turbulent flow. entrainment Definition Englisch, entrainment Bedeutung, Englisch Definitionen Wörterbuch, Siehe auch 'entrancement',entrain',entrapment',entailment', synonyme, biespiele air-oxygen blenders definition. By using our services, you agree to our use of cookies. Most concrete has a w/c of 0.45 to 0.60, which means there is substantial excess water that will not react with cement. Commonly available masks deliver 24, 28, 31, 35, or 40 per cent oxygen. The entrained velocity at the surface is equal to the wheel velocity. entrained air indicator. Look it up now! ), Eur. Environmental water can later fill these voids. What does entrainment mean? 2. Definition von entrainment im Englisch Englisch wörterbuch Any of several processes in which a solid or liquid is put into motion by a fluid . (See also oxygen therapy .) Language: English. A concrete maker introduces the bubbles by adding to the mix an air entraining agent, a surfactant (surface-active substance, a type of chemical that includes detergents). Get XML access to fix the meaning of your metadata. The air bubbles are created during mixing of the plastic (flowable, not hardened) concrete, and most of them survive to be part of the hardened concrete. Air entrainment admixture quantities required to obtain a specific finished air content for mix designs are based on a number of variables including size of aggregate, fineness and quantity of cement and use of SCMs such as fly ash and silica fume. Flooding occurs when the froth level reaches the tray above. This equation is unique as it relates flow energy with kinetic energy and potential energy. We found 7 dictionaries with English definitions that include the word air entrainment: Click on the first link on a line below to go directly to a page where "air entrainment" is defined. Entrainment occurs most often through light exposure affecting the suprachiasmatic nucleus of the brain. Key words: stepped chute, air-entrainment, air-water flow properties, macro-roughness elements, skimming flow. Air Entrainment F1OW Field Induced by a Pool Fire X. C. ZHOU and J. P. GORE* llrermal Sciencesand PmptdsionCentec SchoolofMechanicalEngineering,PurdueUniversity, WestLafayette,IN 47907 A laser Doppler velocimeter (LDV) was used in conjunction with a quiescently seeded ambient enclosure to 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. I personally have been conducting my own back yard testing for more than a year on this very topic. The failure of reinforced concrete is most often due to this cycle, which is accelerated by moisture reaching the reinforcing steel. trains 1. Air entrainment reduces the density of the mix and increases yield. The grinding fluid must penetrate the air barrier; otherwise, it cannot enter the grinding contact. These air bubbles are dispersed throughout the hardened cement paste but are not, by definition… air-entrained concrete synonyms, air-entrained concrete pronunciation, air-entrained concrete translation, English dictionary definition of air-entrained concrete. The primary purpose of air entrainment is to increase the durability of the hardened concrete, especially in climates subject to freeze-thaw; the secondary purpose is to increase workability of the concrete while in a plastic state. Definition of Air Entrainment in Construction. What made you want to look up air entrainment? Air Entrainment in Steep Chute Flows. 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. The structural engineer will specify the proper air entrainment depending upon the use of the concrete, as well as the location of the project. 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. The benefits of smaller machinery are obvious: economy of materials, less energy consumption, less square-footage required. The benefits of smaller machinery are obvious: economy of materials, less energy consumption, less square-footage required. Copy to clipboard; Details / edit; Termium. It is reported that, maximum flexural strength can be achieved even with air contant of 4%. Replacement of cement by up to 35% fly ash and 10% silica fume indicated enhanced frost resistance, without any air-entrainment. 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. 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). Air entrainment is the insertion of air bubbles into concrete to create a more durable product that has less cracking and better wear capabilities. Definition of Air Entrainment in Construction. Examples of localised aeration include air entrainment by plunging water jet and at hydraulic jump. Duration: 1 minute. Air entraining was introduced in the 1930s and most modern concrete, especially if subjected to freezing temperatures, is air-entrained. This increases the resistance of the concrete to freeze-thaw damage in cold climates.… 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. A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage. Air entrainment is the intentional creation of tiny air bubbles in concrete. By definition, entrainment is a form of the verb, entrain, which is fluid that is swept along into an existing moving flow. 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. 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. 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. 'Nip it in the butt' or 'Nip it in the bud'? Liquid is being recycled and carried to the tray above by the froth. 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