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Articoli di riviste sul tema "Capillary number"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 20 febbraio 2023

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1

Guo, Hu, Ma Dou, Wang Hanqing, Fuyong Wang, Gu Yuanyuan, Zhaoyan Yu, Wang Yansheng, and Yiqiang Li. "Proper Use of Capillary Number in Chemical Flooding." Journal of Chemistry 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/4307368.

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Capillary number theory is very important for chemical flooding enhanced oil recovery. The difference between microscopic capillary number and the microscopic one is easy to confuse. After decades of development, great progress has been made in capillary number theory and it has important but sometimes incorrect application in EOR. The capillary number theory was based on capillary tube bundles and Darcy’s law hypothesis, and this should always be kept in mind when used in chemical flooding EOR. The flow in low permeability porous media often shows obvious non-Darcy effects, which is beyond Da

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2

Willführ, Alper, Christina Brandenberger, Tanja Piatkowski, Roman Grothausmann, Jens Randel Nyengaard, Matthias Ochs, and Christian Mühlfeld. "Estimation of the number of alveolar capillaries by the Euler number (Euler-Poincaré characteristic)." American Journal of Physiology-Lung Cellular and Molecular Physiology 309, no. 11 (December 1, 2015): L1286—L1293. http://dx.doi.org/10.1152/ajplung.00410.2014.

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The lung parenchyma provides a maximal surface area of blood-containing capillaries that are in close contact with a large surface area of the air-containing alveoli. Volume and surface area of capillaries are the classic stereological parameters to characterize the alveolar capillary network (ACN) and have provided essential structure-function information of the lung. When loss (rarefaction) or gain (angiogenesis) of capillaries occurs, these parameters may not be sufficient to provide mechanistic insight. Therefore, it would be desirable to estimate the number of capillaries, as it contains

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3

Zhang, Yan, Min Zhang, and Shujuan Qi. "Heat and Mass Transfer in a Thin Liquid Film over an Unsteady Stretching Surface in the Presence of Thermosolutal Capillarity and Variable Magnetic Field." Mathematical Problems in Engineering 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/8521580.

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The heat and mass transfer characteristics of a liquid film which contain thermosolutal capillarity and a variable magnetic field over an unsteady stretching sheet have been investigated. The governing equations for momentum, energy, and concentration are established and transformed to a set of coupled ordinary equations with the aid of similarity transformation. The analytical solutions are obtained using the double-parameter transformation perturbation expansion method. The effects of various relevant parameters such as unsteady parameter, Prandtl number, Schmidt number, thermocapillary numb

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4

Canbazoğlu, Suat, and Fazıl Canbulut. "A note on the flow coefficients of capillary tube and small orifice restrictors exposed to very low Reynolds number flow." Industrial Lubrication and Tribology 57, no. 3 (June 1, 2005): 116–20. http://dx.doi.org/10.1108/00368790510595084.

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PurposeThe main objective of this study was to obtain the flow restricting capacity by determining their flow coefficients and to investigate the unsteady flow with low Reynolds number in the flow‐restricting devices such as orifices and capillary tubes having small diameters.Design/methodology/approachThere is an enormous literature on the flow of Newtonian fluids through capillaries and orifices particularly in many application fields of the mechanical and chemical engineering. But most of the experimental results in literature are given for steady flows at moderate and high Reynolds numbers

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5

Truby, J. M., S. P. Mueller, E. W. Llewellin, and H. M. Mader. "The rheology of three-phase suspensions at low bubble capillary number." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2173 (January 2015): 20140557. http://dx.doi.org/10.1098/rspa.2014.0557.

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We develop a model for the rheology of a three-phase suspension of bubbles and particles in a Newtonian liquid undergoing steady flow. We adopt an ‘effective-medium’ approach in which the bubbly liquid is treated as a continuous medium which suspends the particles. The resulting three-phase model combines separate two-phase models for bubble suspension rheology and particle suspension rheology, which are taken from the literature. The model is validated against new experimental data for three-phase suspensions of bubbles and spherical particles, collected in the low bubble capillary number reg

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6

Hawkes, Elizabeth D., and James E. Neffendorf. "Kestenbaum׳s capillary number test - A forgotten sign?" Multiple Sclerosis and Related Disorders 3, no. 6 (November 2014): 735–37. http://dx.doi.org/10.1016/j.msard.2014.09.087.

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7

Kutter, Bruce L. "Effects of capillary number, Bond number, and gas solubility on water saturation of sand specimens." Canadian Geotechnical Journal 50, no. 2 (February 2013): 133–44. http://dx.doi.org/10.1139/cgj-2011-0250.

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To better understand how to prepare completely water-saturated specimens or centrifuge models from dry sand, the mechanisms of the infiltration and filling of pores in sand are studied. Complete saturation has been shown by others to be especially important in studies involving the triggering of liquefaction. This paper discusses how the degree of saturation obtained during infiltration increases with the “Bond number”, Bo (ratio of body forces and capillary forces), and the “capillary number”, Ca (ratio of viscous forces and capillary forces), as well as the solubility of gas bubbles in the p

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8

Jansons, Kalvis M. "Moving contact lines at non-zero capillary number." Journal of Fluid Mechanics 167, no. -1 (June 1986): 393. http://dx.doi.org/10.1017/s0022112086002860.

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9

Al-Fossail, Khalid, and Lyman L. Handy. "Correlation between capillary number and residual water saturation." Journal of Colloid and Interface Science 134, no. 1 (January 1990): 256–63. http://dx.doi.org/10.1016/0021-9797(90)90273-q.

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10

Zhu, L., E. Lauga, and L. Brandt. "Low-Reynolds-number swimming in a capillary tube." Journal of Fluid Mechanics 726 (May 31, 2013): 285–311. http://dx.doi.org/10.1017/jfm.2013.225.

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AbstractWe use the boundary element method to study the low-Reynolds-number locomotion of a spherical model microorganism in a circular tube. The swimmer propels itself by tangential or normal surface motion in a tube whose radius is of the order of the swimmer size. Hydrodynamic interactions with the tube walls significantly affect the average swimming speed and power consumption of the model microorganism. In the case of swimming parallel to the tube axis, the locomotion speed is always reduced (respectively, increased) for swimmers with tangential (respectively, normal) deformation. In all

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11

Seebergh, Jill E., and John C. Berg. "Dynamic wetting in the low capillary number regime." Chemical Engineering Science 47, no. 17-18 (December 1992): 4455–64. http://dx.doi.org/10.1016/0009-2509(92)85123-s.

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12

Salim, Thamir K. "The Effect of the Capillary Tube Coil Number on the Refrigeration System Performance." Tikrit Journal of Engineering Sciences 19, no. 2 (June 30, 2012): 18–29. http://dx.doi.org/10.25130/tjes.19.2.03.

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The capillary tube performance for (R134a) is experimentally investigated. The experimental setup is a real vapor compression refrigeration system. All properties of the refrigeration system are measured for various mass flow rate from (13 – 23 kg/hr) and capillary tube coil number (0-4) with fixed length (150 cm) and capillary diameter (2.5mm).The results showed that the theoretical compression power increases by (65.8 %) as the condenser temperature increases by (2.71%), also the theoretical compression power decreases by (10.3 %) as the capillary tube coil number increases.The study shows a

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13

Brown, Julian, Todd A. Briscoe, Richard Harding, Megan L. Cock, John F. Bertram, and Jane M. Black. "GLOMERULAR NUMBER AND CAPILLARY DIMENSIONS IN THE NORMAL LAMB KIDNEY." Image Analysis & Stereology 21, no. 3 (May 3, 2011): 157. http://dx.doi.org/10.5566/ias.v21.p157-164.

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Reduced nephron endowment, either inherited or acquired, has been linked to adult renal pathology as well as hypertension. The sheep provides an excellent model for studying nephrogenesis and renal development because, as in humans, nephrogenesis is complete before birth. In the present study, the physical disector/fractionator method was used to estimate the total number of glomeruli, and thereby nephrons, in normal lambs. Glomerular capillary parameters including mean capillary length per glomerulus, mean capillary surface area per glomerulus and total renal filtration surface area (TRFSA) w

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14

Wang, Lanlan, Hongzhong Liu, Weitao Jiang, Rui Li, Fang Li, Zhongbo Yang, Lei Yin, Yongsheng Shi, and Bangdao Chen. "Capillary number encouraged the construction of smart biomimetic eyes." Journal of Materials Chemistry C 3, no. 23 (2015): 5896–902. http://dx.doi.org/10.1039/c5tc00270b.

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15

Liu, Haihu, and Yonghao Zhang. "Lattice Boltzmann Simulation of Droplet Generation in a Microfluidic Cross-Junction." Communications in Computational Physics 9, no. 5 (May 2011): 1235–56. http://dx.doi.org/10.4208/cicp.231009.101110s.

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AbstractUsing the lattice Boltzmann multiphase model, numerical simulations have been performed to understand the dynamics of droplet formation in a microfluidic cross-junction. The influence of capillary number, flow rate ratio, viscosity ratio, and viscosity of the continuous phase on droplet formation has been systematically studied over a wide range of capillary numbers. Two different regimes, namely the squeezinglike regime and the dripping regime, are clearly identified with the transition occurring at a critical capillary number Cacr. Generally, large flow rate ratio is expected to prod

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16

JOEKAR-NIASAR, V., S. M. HASSANIZADEH, and H. K. DAHLE. "Non-equilibrium effects in capillarity and interfacial area in two-phase flow: dynamic pore-network modelling." Journal of Fluid Mechanics 655 (July 5, 2010): 38–71. http://dx.doi.org/10.1017/s0022112010000704.

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Current macroscopic theories of two-phase flow in porous media are based on the extended Darcy's law and an algebraic relationship between capillary pressure and saturation. Both of these equations have been challenged in recent years, primarily based on theoretical works using a thermodynamic approach, which have led to new governing equations for two-phase flow in porous media. In these equations, new terms appear related to the fluid–fluid interfacial area and non-equilibrium capillarity effects. Although there has been a growing number of experimental works aimed at investigating the new e

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17

Chen, Tao Ping, Biao Qiu, and Qi Hao Hu. "Modification and Application of Capillary Number to Oil Displacement in Low Permeability Reservoirs." Advanced Materials Research 868 (December 2013): 522–28. http://dx.doi.org/10.4028/www.scientific.net/amr.868.522.

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As concerning the limitations of the classic capillary number theory in the applications to the oil displacement with the ultra low interfacial intension system in low permeability reservoirs, considering the flow velocity of water/oil displacement through pores in low permeability reservoirs and the mechanism of displacement of the remaining oil in the parallel pores, and considering the influences of ultra low interfacial intension on oil/water relative permeability and the influences of non-homogeneity on the recovery, the expression of modification of the capillary number was given. The re

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18

Mohammadi-Khanaposhtani, Mohammad, Yousef Kazemzadeh, and Reza Daneshfar. "Positive coupling effect in gas condensate flow: Role of capillary number, Scheludko number and Weber number." Journal of Petroleum Science and Engineering 203 (August 2021): 108490. http://dx.doi.org/10.1016/j.petrol.2021.108490.

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19

Desjardins, C., and B. R. Duling. "Heparinase treatment suggests a role for the endothelial cell glycocalyx in regulation of capillary hematocrit." American Journal of Physiology-Heart and Circulatory Physiology 258, no. 3 (March 1, 1990): H647—H654. http://dx.doi.org/10.1152/ajpheart.1990.258.3.h647.

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Physiological stimuli induce rapid and unexplained increases in the number of red blood cells within capillaries of skeletal muscle. We hypothesized that such alterations in intracapillary red cell numbers might be due to an undefined interaction between one or more components of blood and the luminal surface of the capillary. This proposition was tested by in situ microperfusion of capillaries with enzymes directed against macromolecules likely to be expressed on the surface of endothelial cells. The instantaneous fractional volume of red blood cells within a capillary (tube hematocrit) was u

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20

Bhat, Pradeep P., Osman A. Basaran, and Matteo Pasquali. "Dynamics of viscoelastic liquid filaments: Low capillary number flows." Journal of Non-Newtonian Fluid Mechanics 150, no. 2-3 (April 2008): 211–25. http://dx.doi.org/10.1016/j.jnnfm.2007.10.021.

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21

Sheng, James J. "Preferred calculation formula and buoyancy effect on capillary number." Asia-Pacific Journal of Chemical Engineering 10, no. 3 (March 20, 2015): 400–410. http://dx.doi.org/10.1002/apj.1883.

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22

Argentina, M., A. Cohen, Y. Bouret, N. Fraysse, and C. Raufaste. "One-dimensional capillary jumps." Journal of Fluid Mechanics 765 (January 15, 2015): 1–16. http://dx.doi.org/10.1017/jfm.2014.717.

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AbstractIn flows where the ratio of inertia to gravity varies strongly, large variations in the fluid thickness appear and hydraulic jumps arise, as depicted by Rayleigh. We report a new family of hydraulic jumps, where the capillary effects dominate the gravitational acceleration. The Bond number – which measures the importance of gravitational body forces compared to surface tension – must be small in order to observe such objects using capillarity as a driving force. For water, the typical length should be smaller than 3 mm. Nevertheless, for such small scales, solid boundaries induce visco

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23

Alipour Tabrizy, Vahid. "Investigation of CO2 Enhanced Oil Recovery Using Dimensionless Groups in Wettability Modified Chalk and Sandstone Rocks." Journal of Petroleum Engineering 2014 (March 26, 2014): 1–16. http://dx.doi.org/10.1155/2014/430309.

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The paper addresses enhanced oil recovery in chalk and sandstone rocks by CO2 injection, with different wettability, porosity, and permeability as well as injection rate and flooding conditions. Results indicate that an increase in Bond number has a positive effect on oil recovery whereas for capillary number, there is a limit in which recovery is improving. This limit is estimated when the pressure drop by viscous force is approximately equal to the threshold balance between capillary and gravity forces. A dimensionless group is proposed that combines the effect of capillarity, injection rate

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24

WALTER, J., A. V. SALSAC, and D. BARTHÈS-BIESEL. "Ellipsoidal capsules in simple shear flow: prolate versus oblate initial shapes." Journal of Fluid Mechanics 676 (April 4, 2011): 318–47. http://dx.doi.org/10.1017/s0022112011000486.

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The large deformations of an initially-ellipsoidal capsule in a simple shear flow are studied by coupling a boundary integral method for the internal and external flows and a finite-element method for the capsule wall motion. Oblate and prolate spheroids are considered (initial aspect ratios: 0.5 and 2) in the case where the internal and external fluids have the same viscosity and the revolution axis of the initial spheroid lies in the shear plane. The influence of the membrane mechanical properties (mechanical law and ratio of shear to area dilatation moduli) on the capsule behaviour is inves

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25

AlQuaimi, B. I., and W. R. Rossen. "Capillary Desaturation Curve for Residual Nonwetting Phase in Natural Fractures." SPE Journal 23, no. 03 (February 5, 2018): 788–802. http://dx.doi.org/10.2118/189448-pa.

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Summary The displacement of a nonwetting phase by a wetting phase is characterized by the capillary number. Different forms of capillary number have been used in the literature for flow in porous media. A capillary number for a single rock fracture has been defined in the literature, using the mean aperture to characterize the trapping and mobilization in a fracture. We propose a new capillary-number definition for fractures that incorporates geometrical characterization of the fracture, dependent on the force balance on a trapped ganglion. The new definition is validated with laboratory exper

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26

LAC, ETIENNE, and J. D. SHERWOOD. "Motion of a drop along the centreline of a capillary in a pressure-driven flow." Journal of Fluid Mechanics 640 (November 2, 2009): 27–54. http://dx.doi.org/10.1017/s0022112009991212.

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The deformation of a drop as it flows along the axis of a circular capillary in low Reynolds number pressure-driven flow is investigated numerically by means of boundary integral computations. If gravity effects are negligible, the drop motion is determined by three independent parameters: the size a of the undeformed drop relative to the radius R of the capillary, the viscosity ratio λ between the drop phase and the wetting phase and the capillary number Ca, which measures the relative importance of viscous and capillary forces. We investigate the drop behaviour in the parameter space (a/R, λ

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27

Enad, J. G., M. Fournier, and G. C. Sieck. "Oxidative capacity and capillary density of diaphragm motor units." Journal of Applied Physiology 67, no. 2 (August 1, 1989): 620–27. http://dx.doi.org/10.1152/jappl.1989.67.2.620.

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Motor units in the cat diaphragm (DIA) were isolated in situ by microdissection and stimulation of C5 ventral root filaments. Motor units were classified based on their isometric contractile force responses and fatigue indexes (FI). The muscle fibers belonging to individual units (i.e., the muscle unit) were identified using the glycogen-depletion method. Fibers were classified as type I or II based on histochemical staining for myofibrillar adenosine triphosphatase (ATPase) after alkaline preincubation. The rate of succinate dehydrogenase (SDH) activity of each fiber was determined using a mi

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28

Mathieu-Costello, Odile, Peter J. Agey, Richard B. Logemann, Richard W. Brill, and Peter W. Hochachka. "Capillary–fiber geometrical relationships in tuna red muscle." Canadian Journal of Zoology 70, no. 6 (June 1, 1992): 1218–29. http://dx.doi.org/10.1139/z92-169.

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The aim of this study was to examine the size and geometry of the capillary network in tuna red muscle, one of the most aerobic muscles in fish. Deep red muscle of 1.5- to 2-kg skipjack tuna, Katsuwonus pelamis, was perfusion fixed in situ, processed for electron microscopy, and analyzed by morphometry. Fiber cross-sectional area was 560 ± 30 (SE) μm2 in the samples. Capillary length per fiber volume was 4143 ± 242 (SE) mm−2 and mitochondrial volume density 28.5 ± 1.0 (SE) %. Indexes of capillarity such as average number of capillaries around a fiber, capillary length and surface per fiber vol

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29

He, Xiansong, Yi Liu, and Wangqing Wu. "A General and Efficient Approach for the Dual-Scale Infiltration Flow Balancing in In Situ Injection Molding of Continuous Fiber Reinforced Thermoplastic Composites." Polymers 13, no. 16 (August 12, 2021): 2689. http://dx.doi.org/10.3390/polym13162689.

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In situ injection molding of continuous fiber reinforced thermoplastic composites is challenged by unbalanced dual-scale infiltration flow due to the pronounced capillary effect. In this paper, a general and efficient approach was proposed for dual-scale infiltration flow balancing based on numerical simulation. Specifically, Stokes and Brinkman equations were used to describe the infiltration flow in inter- and intra-fiber bundles. In particular, capillary pressure drop was integrated in the Brinkmann equation to consider the capillary effect. The infiltration flow front is tracked by the lev

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30

Plyley, Michael J., Barbara J. Olmstead, and Earl G. Noble. "Time course of changes in capillarization in hypertrophied rat plantaris muscle." Journal of Applied Physiology 84, no. 3 (March 1, 1998): 902–7. http://dx.doi.org/10.1152/jappl.1998.84.3.902.

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The time course of angiogenesis during hypertrophy of the rat plantaris muscle was studied by using a unilateral, synergistic ablation model. Animals ( n = 6/group) were euthanized 2, 5, 7, 15, 21, and 30 days postmyectomy. Sections from both the hypertrophied and contralateral muscles were simultaneously stained for capillaries and muscle fiber type. Mean fiber cross-sectional area (FA) and various indexes of capillarity were determined by using a video analysis system. The capillary supply to individual fibers, assessed as the FA supplied per capillary contact, remained unchanged until day 2

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31

Zoccoli, Giovanna, Maria Luisa Lucchi, Emanuela Andreoli, Veronique Bach, Tullia Cianci, Pierluigi Lenzi, and Carlo Franzini. "Brain Capillary Perfusion during Sleep." Journal of Cerebral Blood Flow & Metabolism 16, no. 6 (November 1996): 1312–18. http://dx.doi.org/10.1097/00004647-199611000-00028.

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Brain capillary perfusion was evaluated in the different states of the wake–sleep cycle—quiet wakefulness (QW), quiet sleep (QS), and active sleep (AS)—in rats. The extent of the perfused capillary network was determined by intravascular distribution of a fluorescent marker, Evans blue (EB); it remained unchanged across the three behavioral conditions, QW, QS, and AS. The anatomical network was assessed by alkaline phosphatase (AP) endothelial staining, which is known to underestimate the number of existing capillaries. The resulting number of AP profiles were, therefore, significantly lower t

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Schulkes, R. M. S. M. "The evolution of capillary fountains." Journal of Fluid Mechanics 261 (February 25, 1994): 223–52. http://dx.doi.org/10.1017/s0022112094000327.

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In this paper we consider the dynamics of a growing capillary fountain. We assume that at some time t = 0 an inviscid incompressible fluid is ejected vertically upwards through a circular nozzle. The subsequent dynamics of the resulting fountain is studied numerically using the boundary-element technique. The rate at which fluid is discharged from the nozzle and the Bond number (a measure of gravitational and surface tension forces) are the parameters that govern the dynamics of the fountain. For small discharge rates the fountain assumes the form of a slowly growing sessile drop, with dynamic

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Dyck, P. J., S. Hansen, J. Karnes, P. O'Brien, H. Yasuda, A. Windebank, and B. Zimmerman. "Capillary number and percentage closed in human diabetic sural nerve." Proceedings of the National Academy of Sciences 82, no. 8 (April 1, 1985): 2513–17. http://dx.doi.org/10.1073/pnas.82.8.2513.

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Reddy, Shravanthi, P. Randall Schunk, and Roger T. Bonnecaze. "Dynamics of low capillary number interfaces moving through sharp features." Physics of Fluids 17, no. 12 (December 2005): 122104. http://dx.doi.org/10.1063/1.2140691.

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Hsueh, Ching, Carmen Lucía Moraila Martínez, Frédéric Doumenc, Miguel A. Rodríguez-Valverde, and Béatrice Guerrier. "Self-assembly in drying complex fluid at low capillary number." Chemical Engineering and Processing: Process Intensification 68 (June 2013): 64–68. http://dx.doi.org/10.1016/j.cep.2012.07.006.

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Kamiya, Akira, Shinya Takeda, and Masahiro Shibata. "Optimum capillary number for oxygen delivery to tissue in man." Bulletin of Mathematical Biology 49, no. 3 (May 1987): 351–61. http://dx.doi.org/10.1007/bf02460125.

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Kamotani, Y., S. Ostrach, and J. P. Kizito. "Experimental free coating flows at high capillary and Reynolds number." Experiments in Fluids 27, no. 3 (August 3, 1999): 235–43. http://dx.doi.org/10.1007/s003480050348.

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Ponce F., Ranena V., Vladimir Alvarado, and Marcio S. Carvalho. "Water-alternating-macroemulsion reservoir simulation through capillary number-dependent modeling." Journal of the Brazilian Society of Mechanical Sciences and Engineering 39, no. 10 (August 12, 2017): 4135–45. http://dx.doi.org/10.1007/s40430-017-0885-7.

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KAMIYA, A., S. TAKEDA, and M. SHIBATA. "Optimum capillary number for oxygen delivery to tissue in man." Bulletin of Mathematical Biology 49, no. 3 (1987): 351–61. http://dx.doi.org/10.1016/s0092-8240(87)80029-0.

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SCHLEIZER, ANTHONY D., and ROGER T. BONNECAZE. "Displacement of a two-dimensional immiscible droplet adhering to a wall in shear and pressure-driven flows." Journal of Fluid Mechanics 383 (March 25, 1999): 29–54. http://dx.doi.org/10.1017/s0022112098003462.

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The dynamic behaviour and stability of a two-dimensional immiscible droplet subject to shear or pressure-driven flow between parallel plates is studied under conditions of negligible inertial and gravitational forces. The droplet is attached to the lower plate and forms two contact lines that are either fixed or mobile. The boundary-integral method is used to numerically determine the flow along and dynamics of the free surface. For surfactant-free interfaces with fixed contact lines, the deformation of the interface is determined for a range of capillary numbers, droplet to displacing fluid v

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CHANG, Yen-Sheng, Chun-Min SHIH,, Yen-Cheng LI, and Cheng-Huang LIN. "Large-Volume Sample Sweeping with a High Theoretical Plate Number Using a Coupled-Capillary in Capillary Electrophoresis." Analytical Sciences 22, no. 4 (2006): 557–61. http://dx.doi.org/10.2116/analsci.22.557.

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Aggelopoulos, C. A., and C. D. Tsakiroglou. "The effect of micro-heterogeneity and capillary number on capillary pressure and relative permeability curves of soils." Geoderma 148, no. 1 (November 2008): 25–34. http://dx.doi.org/10.1016/j.geoderma.2008.08.011.

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Chang, Tong-Bou, Bai-Heng Shiue, Yi-Bin Ciou, and Wai-Io Lo. "Analytical Investigation into Effects of Capillary Force on Condensate Film Flowing over Horizontal Semicircular Tube in Porous Medium." Mathematical Problems in Engineering 2021 (March 17, 2021): 1–10. http://dx.doi.org/10.1155/2021/6693512.

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A theoretical investigation is performed into the problem of laminar filmwise condensation flow over a horizontal semicircular tube embedded in a porous medium and subject to capillary forces. The effects of the capillary force and gravity force on the condensation heat transfer performance are analyzed using an energy balance approach method. For analytical convenience, several dimensionless parameters are introduced, including the Jakob number Ja, Rayleigh number Ra, and capillary force parameter Boc. The resulting dimensionless governing equation is solved using the numerical shooting metho

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44

Deike, Luc, Stephane Popinet, and W. Kendall Melville. "Capillary effects on wave breaking." Journal of Fluid Mechanics 769 (March 25, 2015): 541–69. http://dx.doi.org/10.1017/jfm.2015.103.

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We investigate the influence of capillary effects on wave breaking through direct numerical simulations of the Navier–Stokes equations for a two-phase air–water flow. A parametric study in terms of the Bond number, $\mathit{Bo}$, and the initial wave steepness, ${\it\epsilon}$, is performed at a relatively high Reynolds number. The onset of wave breaking as a function of these two parameters is determined and a phase diagram in terms of $({\it\epsilon},\mathit{Bo})$ is presented that distinguishes between non-breaking gravity waves, parasitic capillaries on a gravity wave, spilling breakers an

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45

Sugihardjo, Sugihardjo. "Capillary Desaturation Curves For Evaluating Surfactant Performance By Core Flooding Experiments." Scientific Contributions Oil and Gas 32, no. 1 (March 17, 2022): 16–20. http://dx.doi.org/10.29017/scog.32.1.828.

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Abstract (sommario):

Capillary desaturation curves are normally generated in laboratory scale by means of core flooding experiments to evaluate the surfactant formulations for chemical injection in EOR projects. Low tension surfactant solution is the only liquid that could increase the dimensionless capillary number in order of magnitude of 103. Two types of core samples have been used in core flooding experiments to develop capillary desaturation curves, i.e., generic and standard Classhach core samples. In Addition, VS surfactant and additional alcohols are also used in these experiments. The higher the capillar

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46

Singh, Rajesh Kumar, Xiaoyi Li, and Kausik Sarkar. "Lateral migration of a capsule in plane shear near a wall." Journal of Fluid Mechanics 739 (December 20, 2013): 421–43. http://dx.doi.org/10.1017/jfm.2013.624.

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Abstract (sommario):

AbstractThe migration of a capsule enclosed by an elastic membrane in a wall-bounded linear shear is investigated using a front-tracking method. A detailed comparison with the migration of a viscous drop is presented varying the capillary number (in the case of a capsule, the elastic capillary number) and the viscosity ratio. In both cases, the deformation breaks the flow reversal symmetry and makes them migrate away from the wall. They quickly go through a transient evolution to eventually reach a quasi-steady state where the dynamics becomes independent of the initial position and only depen

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47

Loizou, Katerina, Voon-Loong Wong, and Buddhika Hewakandamby. "Examining the Effect of Flow Rate Ratio on Droplet Generation and Regime Transition in a Microfluidic T-Junction at Constant Capillary Numbers." Inventions 3, no. 3 (August 10, 2018): 54. http://dx.doi.org/10.3390/inventions3030054.

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Abstract (sommario):

The focus of this work is to examine the effect of flow rate ratio (quotient of the dispersed phase flow rate over the continuous phase flow rate) on a regime transition from squeezing to dripping at constant capillary numbers. The effect of the flow rate ratio on the volume of droplets generated in a microfluidic T-junction is discussed, and a new scaling law to estimate their volume is proposed. Existing work on a regime transition reported by several researchers focuses on the effect of the capillary number on regime transition, and the results that are presented in this paper advance the c

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48

Hepple, Russell T., Peter J. Agey, Larnelle Hazelwood, Joseph M. Szewczak, Richard E. MacMillen, and Odile Mathieu-Costello. "Increased capillarity in leg muscle of finches living at altitude." Journal of Applied Physiology 85, no. 5 (November 1, 1998): 1871–76. http://dx.doi.org/10.1152/jappl.1998.85.5.1871.

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Abstract (sommario):

An increased ratio of muscle capillary to fiber number (capillary/fiber number) at altitude has been found in only a few investigations. The highly aerobic pectoralis muscle of finches living at 4,000-m altitude ( Leucosticte arctoa; A) was recently shown to have a larger capillary/fiber number and greater contribution of tortuosity and branching to total capillary length than sea-level finches ( Carpodacus mexicanus; SL) of the same subfamily (O. Mathieu-Costello, P. J. Agey, L. Wu, J. M. Szewczak, and R. E. MacMillen. Respir. Physiol. 111: 189–199, 1998). To evaluate the role of muscle aerob

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49

Calderón, Andrés J., J. Brian Fowlkes, and Joseph L. Bull. "Bubble splitting in bifurcating tubes: a model study of cardiovascular gas emboli transport." Journal of Applied Physiology 99, no. 2 (August 2005): 479–87. http://dx.doi.org/10.1152/japplphysiol.00656.2004.

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Abstract (sommario):

The transport of long gas bubbles, suspended in liquid, through symmetric bifurcations, is investigated experimentally and theoretically as a model of cardiovascular gas bubble transport in air embolism and gas embolotherapy. The relevant dimensionless parameters in the models match the corresponding values for arteries and arterioles. The effects of roll angle (the angle the plane of the bifurcation makes with the horizontal), capillary number (a dimensionless indicator of flow), and bubble volume (or length) on the splitting of bubbles as they pass through the bifurcation are examined. Split

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50

Yu, Yuan, Haihu Liu, Yonghao Zhang, and Dong Liang. "Color-gradient lattice Boltzmann modeling of immiscible two-phase flows on partially wetting surfaces." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 3 (December 28, 2017): 416–30. http://dx.doi.org/10.1177/0954406217749616.

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Abstract (sommario):

A zero-interfacial-force condition is derived and implemented to improve the wetting boundary scheme for a lattice Boltzmann color-gradient model. This new wetting boundary scheme is validated by two static problems, i.e. a droplet resting on a flat surface and a cylindrical surface, and one dynamic problem, i.e. the capillary filling in a two-dimensional channel. In these simulations, we observe that non-physical mass transfer is suppressed and spurious velocities become smaller. Meanwhile, accurate results including dynamic contact line movement are achieved for a broad range of contact angl

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