The extraction of the water-air phase through a single filtration hole

Abstract

The conducted studies allowed us to establish that the shape of the filtration holes should be subject to the above patterns. The second - it was established on the basis of the analysis of real Reynolds numbers and visual observations that the water extraction mode in the zone of action of the peristaltic wave of compaction is divided into three stages: a) laminar spin mode; b) turbulent spin mode; c) intermittent spin mode. The first stage of water extraction is determined by the classical two-dimensional (coordinate X and time t) water movement in a porous medium. Usually, this task is complicated by the presence of a water and gas phase in the squeezed stream. The first phase ends with the turbulent motion of the liquid-air phase. Turbulence as the second stage of the extraction of the water-air phase is determined by the dependence of the critical Reynolds number on the action of complex technological factors of hyper-compaction. This includes vibro-shock of peristaltic pressure and shear deformations from the reciprocating movements of the moldable mixture. The second stage ends with the transition to intermittent extraction of residual water. The third stage of extraction is characterized by the ultimate level of compaction (P max ) by breaking continuous filter channels and the transition to a submicrocellular structure of the compacted mixture [1, 2, 3, 4].

Change in the strength properties of modified concrete over time

“…Further studies conducted by E. N. Shcherbakov have shown that high-strength concretes (grades up to 1000) also obey regularity (1) quite well. This can be seen from the analysis of the data of numerous researchers given in [9][10][11][12][13][14][15].…”

Compressive strength properties of hyper-compacted concrete

“…Numerous studies [24][25][26][27][28][29] have established that the degree of squeezing out excess mixing water during vibration-impact pressing depends on its initial content in concrete, on cement consumption, the initial volume of voids in the mixture, and the intensity of compaction, fig. 1, and the highest compression ratio corresponds to a pressure of 3 to 7 MPa.…”

“…The production of high-strength concrete by vibration-impact pressing is achieved by densely filling the intergranular space with cement paste and mortar with a simultaneous displacement of air bubbles, squeezing out part of the free water behind the portions of the compacted mixture [13][14][15][16][17][18][19]. In case of an unsuccessful selection of the composition of the concrete mixture, a rigid, practically incompressible frame of aggregate grains can form [20][21][22][23][24][25][26]. Note: Above the line is test results of concrete samples, compacted; vibro-impact pressing, under the line -the same, compacted by vibration, Where: R bvp is the strength of vibro-impact-peristaltic pressed concrete; R bv is the strength of vibro-compacted concrete.…”

Simple preparation of novel photochromic polyvinyl alcohol/carboxymethyl cellulose security barcode incorporated with lanthanide‐doped aluminate for anticounterfeiting applications

“…[12] Using the least amount of raw substrates, while still meeting the required criteria, is significant as it allows for cost-effective processing. Light-emitting diodes, [13] air/water filters, [14] medicine delivery, [15] antireflective coatings, [16] electronic tools, [17] and photovoltaics [18] are just a few examples of thin films. A wide range of advanced technical applications can benefit from the desirable properties of nanocomposite films immobilized with nanomaterials, such as catalysis, [19] and antimicrobial, [20] sensory, [21] water repellency, [22] electrical conductivity, [23] and ultraviolet light protection.…”