Log in

Relevant bibliographies by topics / Micro-scale Fluid Mechanics / Journal articles

To see the other types of publications on this topic, follow the link: Micro-scale Fluid Mechanics.

Journal articles on the topic 'Micro-scale Fluid Mechanics'

Author: Grafiati

Published: 6 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Micro-scale Fluid Mechanics.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Song, Fuquan, Heying Ding, Lintao Huang, Yong Wang, and Yeheng Sun. "Research on non-Newtonian characteristics of crude oil flow at micro-nano scale." Physics of Fluids 35, no. 4 (2023): 042011. http://dx.doi.org/10.1063/5.0145727.

Full text

Abstract:

The characteristic scale of flow in micro–nanochannels is generally in the range of 0.01 μm∼1 μm. When crude oil passes through micro-nano channels and tight reservoirs, it shows obvious nonlinear seepage characteristics, which does not conform to the continuity assumption of fluid. Therefore, a non-Newtonian model of crude oil flowing in micro-nano channels and tight reservoirs under the action of shear stress is established, and the relationship between flow rate and apparent viscosity and shear rate is analyzed. The experiment of crude oil flow in micro-nano channels and tight oil reservoir

APA, Harvard, Vancouver, ISO, and other styles

2

Luding, S. "Meso-scale transport in sticky granular fluids." Journal of Fluid Mechanics 864 (February 7, 2019): 1–4. http://dx.doi.org/10.1017/jfm.2019.34.

Full text

Abstract:

Fluid mechanics and rheology involve many unsolved challenges related to the transport mechanisms of mass, momentum and energy – especially when it comes to realistic, industrially relevant materials. Very interesting are suspensions or granular fluids with solid, particulate ingredients that feature contact mechanics on the micro-scale, which affect the transport properties on the continuum- or macro-scale. Their unique ability to behave as either fluid, or solid or both, can be quantified by non-Newtonian rheological rules, and results in interesting mechanisms such as super-diffusion, shear

APA, Harvard, Vancouver, ISO, and other styles

3

Velho Rodrigues, Marcos F., Maciej Lisicki, and Eric Lauga. "The bank of swimming organisms at the micron scale (BOSO-Micro)." PLOS ONE 16, no. 6 (2021): e0252291. http://dx.doi.org/10.1371/journal.pone.0252291.

Full text

Abstract:

Unicellular microscopic organisms living in aqueous environments outnumber all other creatures on Earth. A large proportion of them are able to self-propel in fluids with a vast diversity of swimming gaits and motility patterns. In this paper we present a biophysical survey of the available experimental data produced to date on the characteristics of motile behaviour in unicellular microswimmers. We assemble from the available literature empirical data on the motility of four broad categories of organisms: bacteria (and archaea), flagellated eukaryotes, spermatozoa and ciliates. Whenever possi

APA, Harvard, Vancouver, ISO, and other styles

4

dell'Isola, F., L. Rosa, and C. Woźniak. "A micro-structured continuum modelling compacting fluid-saturated grounds: the effects of pore-size scale parameter." Acta Mechanica 127, no. 1-4 (1998): 165–82. http://dx.doi.org/10.1007/bf01170371.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Pence, Deborah V., Paul A. Boeschoten, and James A. Liburdy. "Simulation of Compressible Micro-Scale Jet Impingement Heat Transfer." Journal of Heat Transfer 125, no. 3 (2003): 447–53. http://dx.doi.org/10.1115/1.1571082.

Full text

Abstract:

A computational study is presented of the heat transfer performance of a micro-scale, axisymmetric, confined jet impinging on a flat surface with an embedded uniform heat flux disk. The jet flow occurs at large, subsonic Mach numbers (0.2 to 0.8) and low Reynolds numbers (419 to 1782) at two impingement distances. The flow is characterized by a Knudsen number of 0.01, based on the viscous boundary layer thickness, which is large enough to warrant consideration of slip-flow boundary conditions along the impingement surface. The effects of Mach number, compressibility, and slip-flow on heat tran

APA, Harvard, Vancouver, ISO, and other styles

6

Squires, Todd M. "Micro-plumes for nano-velocimetry." Journal of Fluid Mechanics 832 (October 26, 2017): 1–4. http://dx.doi.org/10.1017/jfm.2017.688.

Full text

Abstract:

Fluid flows through nano-scale channels depend sensitively on the physical and chemical properties of the walls that surround them. The sub-micron dimensions of such channels, however, are impossible to resolve optically, which rules out most methods for flow visualization. Classic calculations by Squire (Q. J. Mech. Appl. Maths, vol. IV, 1951, pp. 321–329) and Landau & Lifshitz (Fluid Mechanics, vol. 6, 1959, Pergamon) showed that the laminar flow driven outside a capillary, by fluid emerging from the end of the capillary, is identical to the flow driven by a point force proportional to t

APA, Harvard, Vancouver, ISO, and other styles

7

Blanchard, Danny, and Phillip M. Ligrani. "Micro-scale and millimeter-scale rotating disk couette flows, experiments and analysis." Experiments in Fluids 41, no. 6 (2006): 893–903. http://dx.doi.org/10.1007/s00348-006-0208-8.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Youjun, Ji, and K. Vafai. "Analysis of pore scale fluid migration in a porous medium- application to coal rock seam." International Journal of Numerical Methods for Heat & Fluid Flow 27, no. 8 (2017): 1706–19. http://dx.doi.org/10.1108/hff-05-2016-0198.

Full text

Abstract:

Purpose The purpose of this study is to digitize the porous structure and reconstruct the geometry of the rock by using the image processing software photoshop (PS) and ant colony algorithm coded with compiler Fortran PowerStation (fps) 4.0 based on the microscopic image of a typical rock mass. Design/methodology/approach The digital model of the microstructure of the porous coal rock was obtained, and imported into the numerical simulation software to build the finite element model of microstructure of the porous coal rock. Creeping flow equations were used to describe the fluid flow in the p

APA, Harvard, Vancouver, ISO, and other styles

9

Bultreys, T., S. Van Offenwert, W. Goethals, M. N. Boone, J. Aelterman, and V. Cnudde. "X-ray tomographic micro-particle velocimetry in porous media." Physics of Fluids 34, no. 4 (2022): 042008. http://dx.doi.org/10.1063/5.0088000.

Full text

Abstract:

Fluid flow through intricate confining geometries often exhibits complex behaviors, certainly in porous materials, e.g., in groundwater flows or the operation of filtration devices and porous catalysts. However, it has remained extremely challenging to measure 3D flow fields in such micrometer-scale geometries. Here, we introduce a new 3D velocimetry approach for optically opaque porous materials, based on time-resolved x-ray micro-computed tomography (CT). We imaged the movement of x-ray tracing micro-particles in creeping flows through the pores of a sandpack and a porous filter, using labor

APA, Harvard, Vancouver, ISO, and other styles

10

Siginer, Dennis. "Special Section on the Fluid Mechanics and Rheology of Nonlinear Materials at the Macro, Micro, and Nano Scale." Journal of Fluids Engineering 128, no. 1 (2006): 1–5. http://dx.doi.org/10.1115/1.2163070.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Zacharoudiou, Ioannis, Emily M. Chapman, Edo S. Boek, and John P. Crawshaw. "Pore-filling events in single junction micro-models with corresponding lattice Boltzmann simulations." Journal of Fluid Mechanics 824 (July 6, 2017): 550–73. http://dx.doi.org/10.1017/jfm.2017.363.

Full text

Abstract:

The aim of this work is to better understand fluid displacement mechanisms at the pore scale in relation to capillary-filling rules. Using specifically designed micro-models we investigate the role of pore body shape on fluid displacement during drainage and imbibition via quasi-static and spontaneous experiments at ambient conditions. The experimental results are directly compared to lattice Boltzmann (LB) simulations. The critical pore-filling pressures for the quasi-static experiments agree well with those predicted by the Young–Laplace equation and follow the expected filling events. Howev

APA, Harvard, Vancouver, ISO, and other styles

12

ASADI, H., K. JAVAHERDEH, and S. RAMEZANI. "MICROPOLAR FLUID MODEL FOR BLOOD FLOW THROUGH A STENOSED ARTERY." International Journal of Applied Mechanics 05, no. 04 (2013): 1350043. http://dx.doi.org/10.1142/s1758825113500439.

Full text

Abstract:

Various experimental observations have demonstrated that the classical fluid theory is incapable of explaining many phenomena at micro and nano scales. On the other hand, micropolar fluid dynamics can naturally pick up the physical phenomena at these scales owing to its additional degrees of freedom caused by incorporating the effects of fluid molecules on the continuum. Therefore, one of the aims of this paper is to investigate the applicability of the theory of micropolar fluids to modeling and calculating flows in circular microchannels depending on the geometrical dimension of the flow fie

APA, Harvard, Vancouver, ISO, and other styles

13

Johnson, Perry L., and Charles Meneveau. "Predicting viscous-range velocity gradient dynamics in large-eddy simulations of turbulence." Journal of Fluid Mechanics 837 (December 20, 2017): 80–114. http://dx.doi.org/10.1017/jfm.2017.838.

Full text

Abstract:

The detailed dynamics of small-scale turbulence are not directly accessible in large-eddy simulations (LES), posing a modelling challenge, because many micro-physical processes such as deformation of aggregates, drops, bubbles and polymers dynamics depend strongly on the velocity gradient tensor, which is dominated by the turbulence structure in the viscous range. In this paper, we introduce a method for coupling existing stochastic models for the Lagrangian evolution of the velocity gradient tensor with coarse-grained fluid simulations to recover small-scale physics without resorting to direc

APA, Harvard, Vancouver, ISO, and other styles

14

ASADI, H., K. JAVAHERDEH, and S. RAMEZANI. "FINITE ELEMENT SIMULATION OF MICROPOLAR FLUID FLOW IN THE LID-DRIVEN SQUARE CAVITY." International Journal of Applied Mechanics 05, no. 04 (2013): 1350045. http://dx.doi.org/10.1142/s1758825113500452.

Full text

Abstract:

The micropolar fluid theory augments the laws of classical continuum mechanics by incorporating the effects of fluid molecules on the continuum. So, the micropolar theory has been able to explain many phenomena at micro and nano scales. In this paper, a finite element formulation for the numerical analysis of micropolar laminar fluid flow is developed. In order to validate the results of the FE formulation, analytical solution of the Poiseuille flow of micropolar fluid in a microchannel is presented, and an excellent agreement between the results of the analytical solution and those of the FE

APA, Harvard, Vancouver, ISO, and other styles

15

Ostrikov, N. N., and E. M. Zhmulin. "Vortex dynamics of viscous fluid flows. Part 1. Two-dimensional flows." Journal of Fluid Mechanics 276 (October 10, 1994): 81–111. http://dx.doi.org/10.1017/s0022112094002478.

Full text

Abstract:

The method of product integration is applied to the vortex dynamics of two-dimensional incompressible viscous media. In the cases of both unbounded and bounded flows under the no-slip boundary condition, the analytic solutions of the Cauchy problem are obtained for the Helmholtz equation in the form of linear and nonlinear product integrals. The application of product integrals allows the generalization in a natural way of the vortex dynamics concept to the case of viscous flows. However, this new approach requires the reconsideration of some traditional notions of vortex dynamics. Two lengths

APA, Harvard, Vancouver, ISO, and other styles

16

Mistry, Dhiren, Jimmy Philip, and James R. Dawson. "Kinematics of local entrainment and detrainment in a turbulent jet." Journal of Fluid Mechanics 871 (May 30, 2019): 896–924. http://dx.doi.org/10.1017/jfm.2019.327.

Full text

Abstract:

In this paper we investigate the continuous, local exchange of fluid elements as they are entrained and detrained across the turbulent/non-turbulent interface (TNTI) in a high Reynolds number axisymmetric jet. To elucidate characteristic kinematic features of local entrainment and detrainment processes, simultaneous high-speed particle image velocimetry and planar laser-induced fluorescence measurements were undertaken. Using an interface-tracking technique, we evaluate and analyse the conditional dependence of local entrainment velocity in a frame of reference moving with the TNTI in terms of

APA, Harvard, Vancouver, ISO, and other styles

17

Šarler, Božidar, Tadej Dobravec, Gašper Glavan, et al. "Multi-Physics and Multi-Scale Meshless Simulation System for Direct-Chill Casting of Aluminium Alloys." Strojniški vestnik – Journal of Mechanical Engineering 65, no. 11-12 (2019): 658–70. http://dx.doi.org/10.5545/sv-jme.2019.6350.

Full text

Abstract:

This paper represents an overview of the elements of the user-friendly simulation system, developed for computational analysis and optimization of the quality and productivity of the electromagnetically direct-chill cast semi-products from aluminium alloys. The system also allows the computational estimation of the design changes of the casting equipment. To achieve this goal, the electromagnetic and the thermofluid process parameters are coupled to the evolution of Lorentz force, temperature, velocity, concentration, strain and stress fields as well as microstructure evolution. This forms a m

APA, Harvard, Vancouver, ISO, and other styles

18

Gireesha, B. J., and S. Sindhu. "Entropy generation analysis of Casson fluid flow through a vertical microchannel under combined effect of viscous dissipation, joule heating, hall effect and thermal radiation." Multidiscipline Modeling in Materials and Structures 16, no. 4 (2019): 713–30. http://dx.doi.org/10.1108/mmms-07-2019-0139.

Full text

Abstract:

Purpose Fully developed Casson fluid flow through vertical microchannel is deliberated in the presence of thermal radiation. The two predominant features of micro scale phenomenon such as velocity slip and temperature jump are considered. The paper aims to discuss this issue. Design/methodology/approach The governing equations of the physical phenomenon are solved using Runge–Kutta–Fehlberg fourth fifth order method. Findings The outcome of the present work is discussed through graphs. This computation shows that entropy generation rate decreases with enhancing wall ambient temperature differe

APA, Harvard, Vancouver, ISO, and other styles

19

Pawell, Ryan S., Robert A. Taylor, David W. Inglis, and Tracie J. Barber. "Jet Formation in Micro Post Arrays." Applied Mechanics and Materials 553 (May 2014): 367–72. http://dx.doi.org/10.4028/www.scientific.net/amm.553.367.

Full text

Abstract:

Micropost arrays serve as a plaform for the next generation of diagnostic devices. These arrays are found in microfluidic devices for peripheral blood-based diagnostics and metastatic cancer management. The function and performance of these devices is determined by the underlying micro-scale fluid mechanics. Typically, these devices operate in the creeping regime (Re << 1) where the viscous forces of the fluids dominate. Recent advances in manufacturing allow for higher Reynolds number flows (Re >> 1) where the inertial forces dominate. In this work, we use computational simulation

APA, Harvard, Vancouver, ISO, and other styles

20

Chang, Fun Liang, and Yew Mun Hung. "Gravitational effects on electroosmotic flow in micro heat pipes." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 2 (2019): 535–56. http://dx.doi.org/10.1108/hff-01-2019-0008.

Full text

Abstract:

Purpose This paper aims to investigate the coupled effects of electrohydrodynamic and gravity forces on the circulation effectiveness of working fluid in an inclined micro heat pipe driven by electroosmotic flow. The effects of the three competing forces, namely, the capillary, the gravitational and the electrohydrodyanamic forces, on the circulation effectiveness of a micro heat pipe are compared and delineated. Design/methodology/approach The numerical model is developed based on the conservations of mass, momentum and energy with the incorporation of the Young–Laplace equation for electroos

APA, Harvard, Vancouver, ISO, and other styles

21

Dehghani, Hamidreza, and Andreas Zilian. "ANN-aided incremental multiscale-remodelling-based finite strain poroelasticity." Computational Mechanics 68, no. 1 (2021): 131–54. http://dx.doi.org/10.1007/s00466-021-02023-3.

Full text

Abstract:

AbstractMechanical modelling of poroelastic media under finite strain is usually carried out via phenomenological models neglecting complex micro-macro scales interdependency. One reason is that the mathematical two-scale analysis is only straightforward assuming infinitesimal strain theory. Exploiting the potential of ANNs for fast and reliable upscaling and localisation procedures, we propose an incremental numerical approach that considers rearrangement of the cell properties based on its current deformation, which leads to the remodelling of the macroscopic model after each time increment.

APA, Harvard, Vancouver, ISO, and other styles

22

Liu, L. X., C. J. Teo, A. H. Epstein, and Z. S. Spakovszky. "Hydrostatic Gas Journal Bearings for Micro-Turbomachinery." Journal of Vibration and Acoustics 127, no. 2 (2004): 157–64. http://dx.doi.org/10.1115/1.1897738.

Full text

Abstract:

Several years ago an effort was undertaken at MIT to develop high-speed rotating MEMS (Micro Electro-Mechanical Systems) using computer chip fabrication technology. To enable high-power density the micro-turbomachinery must be run at tip speeds of order 500m∕s, comparable to conventional scale turbomachinery. The high rotating speeds (of order 2 million rpm), the relatively low bearing aspect ratios (L∕D<0.1) due to fabrication constraints, and the laminar flow regime in the bearing gap place the micro-bearing designs to an exotic spot in the design space for hydrostatic gas bearings. This

APA, Harvard, Vancouver, ISO, and other styles

23

Zhang, Zhentong, Dominique Legendre, and Rémi Zamansky. "Model for the dynamics of micro-bubbles in high-Reynolds-number flows." Journal of Fluid Mechanics 879 (October 1, 2019): 554–78. http://dx.doi.org/10.1017/jfm.2019.662.

Full text

Abstract:

We propose a model for the acceleration of micro-bubbles (smaller than the dissipative scale of the flow) subjected to the drag and fluid inertia forces in a homogeneous and isotropic turbulent flow. This model, that depends on the Stokes number, Reynolds number and the density ratio, reproduces the evolution of the acceleration variance as well as the relative importance and alignment of the two forces as observed from direct numerical simulations (DNS). We also report that the bubble acceleration statistics conditioned on the local kinetic energy dissipation rate are invariant with the Stoke

APA, Harvard, Vancouver, ISO, and other styles

24

Cotta, Renato M., Péricles C. Pontes, Adam H. R. Sousa, Carolina P. Naveira-Cotta, and Kleber M. Lisboa. "Computational-analytical simulation of microsystems in process intensification." High Temperatures-High Pressures 50, no. 6 (2021): 469–95. http://dx.doi.org/10.32908/hthp.v50.1189.

Full text

Abstract:

Heat and mass transfer enhancement techniques, either passive or active, have an important role in the more general goal of process intensification in modern engineering developments. In this context, the study of transport phenomena at the nano- and micro-scales aims far beyond the plain miniaturization of devices, being mainly directed towards process efficiency improvement and lower energy and raw materials consumption. The analysis of heat and mass transfer at such scales has required the development or extension of both theoretical and experimental methodologies. In light of the inherent

APA, Harvard, Vancouver, ISO, and other styles

25

Vu, Van Huyen, Benoît Trouette, Quy Dong TO, and Eric Chénier. "Hybrid atomistic-continuum multiscale method for fluid flow with density variation in microchannels." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 1 (2018): 3–30. http://dx.doi.org/10.1108/hff-11-2016-0473.

Full text

Abstract:

Purpose This paper aims to extend the hybrid atomistic-continuum multiscale method developed by Vu et al. (2016) to study the gas flow problems in long microchannels involving density variations. Design/methodology/approach The simulation domain is decomposed into three regions: the bulk where the continuous Navier–Stokes and energy equations are solved, the neighbourhood of the wall simulated by molecular dynamics and the overlap region which connects the macroscopic variables (density, velocity and temperature) between the two former regions. For the simulation of long micro/nanochannels, a

APA, Harvard, Vancouver, ISO, and other styles

26

Xu, Qianghui, Xiongyu Chen, Junyu Yang, Zhiying Liu, and Lin Shi. "Pore-scale study of coke combustion in a matrix-fracture system based on the micro-continuum approach." Physics of Fluids 34, no. 3 (2022): 036603. http://dx.doi.org/10.1063/5.0082518.

Full text

Abstract:

In situ combustion is an advanced recovery technique used to exploit heavy oil in the fractured reservoirs that make up approximately one-third of global heavy-oil resources. However, the mesoscopic mechanisms of coke combustion in the multiscale matrix-fracture system are not well understood because of the difficulty of performing pore-resolved simulations. In the present study, a pore-resolved micro-continuum approach was used to investigate fully coupled thermal and reactive flows through fractured media that contain nanometer-range coke pores, micrometer-range matrix pores, and sub-millime

APA, Harvard, Vancouver, ISO, and other styles

27

Clausse, Alejandro, Nicolás Silin, and Gustavo Boroni. "A multiscale method for producing homogenized drag laws of a permeable medium by conflating experimental data with Lattice-Boltzmann simulations." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 11 (2019): 4394–407. http://dx.doi.org/10.1108/hff-01-2019-0058.

Full text

Abstract:

Purpose The purpose of this paper is to obtain a permeability law of a gas flow through a permeable medium using particle image velocimetry experimental data as primal information, which is conflated with numerical calculations by means of a multi-scale method. Design/methodology/approach The D2Q9 single-relaxation-time Lattice Boltzmann model (LBM) implemented in GPU is used for the numerical calculations. In a first homogenized micro-scale, the drag forces are emulated by means of an effective Darcy law acting only in the close neighborhood of the solid structures. A second mesoscopic level

APA, Harvard, Vancouver, ISO, and other styles

28

Karimi, A., and A. M. Ardekani. "Gyrotactic bioconvection at pycnoclines." Journal of Fluid Mechanics 733 (September 26, 2013): 245–67. http://dx.doi.org/10.1017/jfm.2013.415.

Full text

Abstract:

AbstractBioconvection is an important phenomenon in aquatic environments, affecting the spatial distribution of motile micro-organisms and enhancing mixing within the fluid. However, stratification arising from thermal or solutal gradients can play a pivotal role in suppressing the bioconvective flows, leading to the aggregation of micro-organisms and growth of their patchiness. We investigate the combined effects by considering gyrotactic motility where the up-swimming cells are directed by the balance of the viscous and gravitational torques. To study this system, we employ a continuum model

APA, Harvard, Vancouver, ISO, and other styles

29

Li, Kai, Yihui Zhao, Maiqi Liu, Xiaoying Wang, Fangyuan Zhang, and Dazhi Wang. "A multi-scale E-jet 3D printing regulated by structured multi-physics field." Journal of Micromechanics and Microengineering 32, no. 2 (2021): 025005. http://dx.doi.org/10.1088/1361-6439/ac43d1.

Full text

Abstract:

Abstract Micro/nano scale structure as important functional part have been widely used in wearable flexible sensors, gas sensors, biological tissue engineering, microfluidic chips super capacitors and so on. Here a multi-scale electrohydrodynamic jet (E-jet) 3D printing approach regulated by structured multi-physics fields was demonstrated to generate 800 nm scale 2D geometries and high aspect ratio 3D structures. The simulation model of jetting process under resultant effect of top fluid field, middle electric field and bottom thermal field was established. And the physical mechanism and scal

APA, Harvard, Vancouver, ISO, and other styles

30

Khatib, Fadi Al, Afif Gouissem, Armin Eilaghi, and Malek Adouni. "The Effect of Enzymatic Crosslink Degradation on the Mechanics of the Anterior Cruciate Ligament: A Hybrid Multi-Domain Model." Applied Sciences 11, no. 18 (2021): 8580. http://dx.doi.org/10.3390/app11188580.

Full text

Abstract:

The anterior cruciate ligament’s (ACL) mechanics is an important factor governing the ligament’s integrity and, hence, the knee joint’s response. Despite many investigations in this area, the cause and effect of injuries remain unclear or unknown. This may be due to the complexity of the direct link between macro- and micro-scale damage mechanisms. In the first part of this investigation, a three-dimensional coarse-grained model of collagen fibril (type I) was developed using a bottom-up approach to investigate deformation mechanisms under tensile testing. The output of this molecular level wa

APA, Harvard, Vancouver, ISO, and other styles

31

Borg, Matthew K., Duncan A. Lockerby, and Jason M. Reese. "A hybrid molecular–continuum method for unsteady compressible multiscale flows." Journal of Fluid Mechanics 768 (March 10, 2015): 388–414. http://dx.doi.org/10.1017/jfm.2015.83.

Full text

Abstract:

We present an internal-flow multiscale method (‘unsteady-IMM’) for compressible, time-varying/unsteady flow problems in nano-confined high-aspect-ratio geometries. The IMM is a hybrid molecular–continuum method that provides accurate flow predictions at macroscopic scales because local microscopic corrections to the continuum-fluid formulation are generated by spatially and temporally distributed molecular simulations. Exploiting separation in both time and length scales enables orders of magnitude computational savings, far greater than seen in other hybrid methods. We apply the unsteady-IMM

APA, Harvard, Vancouver, ISO, and other styles

32

Xia, Qing, Gangming Sun, Junseok Kim, and Yibao Li. "Multi-scale modeling and simulation of additive manufacturing based on fused deposition technique." Physics of Fluids 35, no. 3 (2023): 034116. http://dx.doi.org/10.1063/5.0141316.

Full text

Abstract:

The issue of multi-scale modeling of the filament-based material extrusion has received considerable critical attention for three-dimensional (3D) printing, which involves complex physicochemical phase transitions and thermodynamic behavior. The lack of a multi-scale theoretical model poses significant challenges for prediction in 3D printing processes driven by the rapidly evolving temperature field, including the nonuniformity of tracks, the spheroidization effect of materials, and inter-track voids. Few studies have systematically investigated the mapping relationship and established the nu

APA, Harvard, Vancouver, ISO, and other styles

33

Xing, Z. B., Xingchao Han, Hanbing Ke, et al. "Multi-phase lattice Boltzmann (LB) simulation for convective transport of nanofluids in porous structures with phase interactions." International Journal of Numerical Methods for Heat & Fluid Flow 31, no. 8 (2021): 2754–88. http://dx.doi.org/10.1108/hff-07-2020-0481.

Full text

Abstract:

Purpose A combination of highly conductive porous media and nanofluids is an efficient way for improving thermal performance of relevant applications. For precisely predicting the flow and thermal transport of nanofluids in porous media, the purpose of this paper is to explore the inter-phase coupling numerical methods. Design/methodology/approach Based on the lattice Boltzmann (LB) method, this study combines the convective flow, non-equilibrium thermal transport and phase interactions of nanofluids in porous matrix and proposes a new multi-phase LB model. The micro-scale momentum and heat in

APA, Harvard, Vancouver, ISO, and other styles

34

Guo, Xiaoyu, and Chiang C. Mei. "Liquid film on a hydrophobic radome or roof top in rain." Journal of Fluid Mechanics 870 (May 16, 2019): 1158–74. http://dx.doi.org/10.1017/jfm.2019.319.

Full text

Abstract:

The water film due to rain falling on a radome surface causes severe losses in radio wave transmission. Hydrophobic coatings have been applied as a remedy to reduce the film thickness and to minimize the losses. However, quantitative accounts of the wave scattering are mostly based on empirical estimates of the film thickness. We describe a fluid-mechanical theory for the film under steady rain falling on a textured surface formed by a square array of pillars. Assuming the water surface on top of the pillars to be in the Cassie–Baxter state, the analysis is carried out by making use of the sha

APA, Harvard, Vancouver, ISO, and other styles

35

ISHIKAWA, TAKUJI, and T. J. PEDLEY. "Diffusion of swimming model micro-organisms in a semi-dilute suspension." Journal of Fluid Mechanics 588 (September 24, 2007): 437–62. http://dx.doi.org/10.1017/s0022112007007847.

Full text

Abstract:

The diffusive behaviour of swimming micro-organisms should be clarified in order to obtain a better continuum model for cell suspensions. In this paper, a swimming micro-organism is modelled as a squirming sphere with prescribed tangential surface velocity, in which the centre of mass of the sphere may be displaced from the geometric centre (bottom-heaviness). Effects of inertia and Brownian motion are neglected, because real micro-organisms swim at very low Reynolds numbers but are too large for Brownian effects to be important. The three-dimensional movement of 64 or 27 identical squirmers i

APA, Harvard, Vancouver, ISO, and other styles

36

Luo, Li, Jingxuan Wang, Yundong Sha, Yanping Hao, and Fengtong Zhao. "Experimental and Numerical Analysis of the Progressive Damage and Failure of SiCf/TC4 Composite Shafts." Applied Sciences 13, no. 10 (2023): 6232. http://dx.doi.org/10.3390/app13106232.

Full text

Abstract:

Long fibre-reinforced metal matrix composite materials, which are widely used in industry, have complex and diverse damage modes due to their structural characteristics. In this study, the progressive damage process and failure mode analysis of the SiCf/TC4 composite shafts were thoroughly investigated under single torsional loads. A bearing performance test was carried out, the damage process was monitored using acoustic emissions, and the fracture specimens were analysed using a scanning electron microscope (SME). More specifically, under reverse torque loading, the damage process was slow-v

APA, Harvard, Vancouver, ISO, and other styles

37

Namazian, Zafar, and S. A. M. Mehryan. "The impacts of non-uniform magnetic field on free convection heat transfer of a magnetizable micropolar nanofluid." International Journal of Numerical Methods for Heat & Fluid Flow 29, no. 10 (2019): 3685–706. http://dx.doi.org/10.1108/hff-10-2018-0551.

Full text

Abstract:

Purpose The purpose of this study is to numerically study the heat transfer of free convection of a magnetizable micropolar nanofluid inside a semicircular enclosure. Design/methodology/approach The flow domain is under simultaneous influences of two non-uniform magnetic fields generated by current carrying wires. The directions of the currents are the same. Although the geometry is symmetric, it is physically asymmetric. The impacts of key parameters, including Rayleigh number Ra = 103-106, Hartman number Ha = 0-50, vortex viscosity parameter Δ = 0-4, nanoparticles volume fraction φ = 0-0.04

APA, Harvard, Vancouver, ISO, and other styles

38

Bourhis, M., M. Pereira, and F. Ravelet. "Performance and flow characteristics of the optimum rotors of Betz, Joukowsky, and Glauert at low tip-speed ratio." Physics of Fluids 34, no. 10 (2022): 105105. http://dx.doi.org/10.1063/5.0107962.

Full text

Abstract:

The advent of the Internet of Things technology has led to a renewed interest in the use of low tip-speed ratio micro-scale wind turbines to supply power to battery-less microsystems. At low tip-speed ratio ( λ), the blade geometry varies significantly depending on the optimal flow conditions used in the classical design method and the blade element/momentum theory (BEMT), and very few papers have examined this controversy. This experimental study aims to investigate the airflow and power characteristics of three 200-cm wind turbines designed according to the BEMT with three different optimum

APA, Harvard, Vancouver, ISO, and other styles

39

Giorgini, Antonio, Saverio Avino, Pietro Malara, Paolo De Natale, and Gianluca Gagliardi. "Liquid Droplet Microresonators." Sensors 19, no. 3 (2019): 473. http://dx.doi.org/10.3390/s19030473.

Full text

Abstract:

We provide here an overview of passive optical micro-cavities made of droplets in the liquid phase. We focus on resonators that are naturally created and suspended under gravity thanks to interfacial forces, illustrating simple ways to excite whispering-gallery modes in various slow-evaporation liquids using free-space optics. Similar to solid resonators, frequency locking of near-infrared and visible lasers to resonant modes is performed exploiting either phase-sensitive detection of the leakage cavity field or multiple interference between whispering-gallery modes in the scattered light. As

APA, Harvard, Vancouver, ISO, and other styles

40

Saisorn, Sira, Adirek Suriyawong, Pochai Srithumkhant, Pakorn Wongpromma, and Somchai Wongwises. "An investigation of horizontal and vertical flow boiling in a single channel with a confinement number beyond the threshold of micro-scale flow." Physics of Fluids 33, no. 11 (2021): 113302. http://dx.doi.org/10.1063/5.0062287.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Wasekar, Vivek M., and Raj M. Manglik. "Short-Time-Transient Surfactant Dynamics and Marangoni Convection Around Boiling Nuclei." Journal of Heat Transfer 125, no. 5 (2003): 858–66. http://dx.doi.org/10.1115/1.1599367.

Full text

Abstract:

The effects of surfactant concentration on the initial short-time-scale Marangoni convection around boiling nuclei in aqueous solutions have been computationally investigated. The model consists of a hemispherical bubble (1–100 μm radius) on a downward-facing constant-temperature heated wall in a fluid pool with an initial uniform temperature gradient. Time-dependent transport of liquid mass, momentum, energy, and surfactant bulk and surface convection along with the adsorption kinetics are considered. Conditions for bubble sizes, surfactant bulk concentrations, and wall heat flux levels are r

APA, Harvard, Vancouver, ISO, and other styles

42

Okulov, V. L., B. R. Sharifullin, N. Okulova, et al. "Influence of nano- and micro-roughness on vortex generations of mixing flows in a cavity." Physics of Fluids 34, no. 3 (2022): 032005. http://dx.doi.org/10.1063/5.0083503.

Full text

Abstract:

Experiments were carried out in a water-filled elongated cup of a “kitchen scale,” where motion was created by a rotating disk with various micro- and nano-roughness in the top of the cup. The obtained results have shown that for some patterns of nanostructures, there is a noticeable growth of a vortex, generated by the disk, while other roughnesses do not make visible changes in the flow structure. The results are of interest in assessing the efficiency of surfaces with nanoscale roughnesses. Indeed, the first type of nano-roughness may become useful for enhancing soft mixing in chemical and

APA, Harvard, Vancouver, ISO, and other styles

43

Pujara, N., M. A. R. Koehl, and E. A. Variano. "Rotations and accumulation of ellipsoidal microswimmers in isotropic turbulence." Journal of Fluid Mechanics 838 (January 12, 2018): 356–68. http://dx.doi.org/10.1017/jfm.2017.912.

Full text

Abstract:

Aquatic micro-organisms and artificial microswimmers locomoting in turbulent flow encounter velocity gradients that rotate them, thereby changing their swimming direction and possibly providing cues about the local flow environment. Using numerical simulations of ellipsoidal particles in isotropic turbulence, we investigate the effects of body shape and swimming velocity on particle motion. Four particle shapes (sphere, rod, disc and triaxial ellipsoid) are investigated at five different swimming velocities in the range $0\leqslant V_{s}\leqslant 5u_{\unicode[STIX]{x1D702}}$, where $V_{s}$ is

APA, Harvard, Vancouver, ISO, and other styles

44

Azarmanesh, Milad, Mousa Farhadi, and Pooya Azizian. "Simulation of the double emulsion formation through a hierarchical T-junction microchannel." International Journal of Numerical Methods for Heat & Fluid Flow 25, no. 7 (2015): 1705–17. http://dx.doi.org/10.1108/hff-09-2014-0294.

Full text

Abstract:

Purpose – The purpose of this paper is to present a practical way to create three kinds of double emulsions such as double emulsion, double-component double emulsion and viscoelastic double emulsion. Design/methodology/approach – A hierarchical T-junction microfluidic device is selected to simulate this phenomenon. A system of the three-phase flows consists of the inner, middle and outer phases were simulated by the direct numerical simulation (DNS) method. The dripping regime is considered for the droplet formation in both T-junctions. The adaptive mesh refinement technique is used to simulat

APA, Harvard, Vancouver, ISO, and other styles

45

Papon, Easir Arafat, and Anwarul Haque. "Review on process model, structure-property relationship of composites and future needs in fused filament fabrication." Journal of Reinforced Plastics and Composites 39, no. 19-20 (2020): 758–89. http://dx.doi.org/10.1177/0731684420929757.

Full text

Abstract:

This paper presents the state-of-the-art of additive manufacturing of composites for processing functional, load-bearing components. A general overview of different additive manufacturing methods is provided, and specific attention is focused on fused filament fabrication-based composites processing. Different process modeling strategies are summarized, and key aspects of these models are discussed. Significant results such as thermal and fluid flow characteristics, effects of nozzle geometry on melt flow, fiber orientation, bead spreading, and solidification, the formation of residual stresse

APA, Harvard, Vancouver, ISO, and other styles

46

GULITSKI, G., M. KHOLMYANSKY, W. KINZELBACH, B. LÜTHI, A. TSINOBER, and S. YORISH. "Velocity and temperature derivatives in high-Reynolds-number turbulent flows in the atmospheric surface layer. Part 1. Facilities, methods and some general results." Journal of Fluid Mechanics 589 (October 8, 2007): 57–81. http://dx.doi.org/10.1017/s0022112007007495.

Full text

Abstract:

This is a report on a field experiment in an atmospheric surface layer at heights between 0.8 and 10m with the Taylor micro-scale Reynolds number in the range Reλ = 1.6−6.6 ×103. Explicit information is obtained on the full set of velocity and temperature derivatives both spatial and temporal, i.e. no use of Taylor hypothesis is made. The report consists of three parts. Part 1 is devoted to the description of facilities, methods and some general results. Certain results are similar to those reported before and give us confidence in both old and new data, since this is the first repetition of t

APA, Harvard, Vancouver, ISO, and other styles

47

Collado, Francisco J., Carlos Monné, Antonio Pascau, Daniel Fuster, and Andrés Medrano. "Thermodynamics of Void Fraction in Saturated Flow Boiling." Journal of Heat Transfer 128, no. 6 (2005): 611–15. http://dx.doi.org/10.1115/1.2190696.

Full text

Abstract:

Recently, Collado (Proc, IMECE 2001, Symposium on Fluid Physics and Heat Transfer for Macro- and Micro-Scale Gas-Liquid and Phase Change Flows) suggested calculating void fraction, an essential element in thermal-hydraulics, working with the “thermodynamic” quality instead of the usual “flow” quality. The “thermodynamic” quality is a state variable, which has a direct relation with the actual vapor volumetric fraction, or void fraction, through phase densities. This approach provides a procedure for predicting void fraction, if values of “thermodynamic” quality are available. However, the stan

APA, Harvard, Vancouver, ISO, and other styles

48

Rani, Sarma L., Rohit Dhariwal, and Donald L. Koch. "Clustering of rapidly settling, low-inertia particle pairs in isotropic turbulence. Part 2. Comparison of theory and DNS." Journal of Fluid Mechanics 871 (May 22, 2019): 477–88. http://dx.doi.org/10.1017/jfm.2019.294.

Full text

Abstract:

Part 1 (Rani et al. J. Fluid Mech., vol. 871, 2019, pp. 450–476) of this study presented a stochastic theory for the clustering of monodisperse, rapidly settling, low-Stokes-number particle pairs in homogeneous isotropic turbulence. The theory involved the development of closure approximations for the drift and diffusion fluxes in the probability density function (p.d.f.) equation for the pair relative positions $\boldsymbol{r}$. In this part 2 paper, the theory is quantitatively analysed by comparing its predictions of particle clustering with data from direct numerical simulations (DNS) of i

APA, Harvard, Vancouver, ISO, and other styles

49

Chaudhary, Indresh, Piyush Garg, V. Shankar, and Ganesh Subramanian. "Elasto-inertial wall mode instabilities in viscoelastic plane Poiseuille flow." Journal of Fluid Mechanics 881 (October 24, 2019): 119–63. http://dx.doi.org/10.1017/jfm.2019.759.

Full text

Abstract:

A linear stability analysis of plane Poiseuille flow of an upper-convected Maxwell (UCM) fluid, bounded between rigid plates separated by a distance $2L$, has been carried out to investigate the interplay of elasticity and inertia on flow stability. The stability is governed by the following dimensionless groups: the Reynolds number $Re=\unicode[STIX]{x1D70C}U_{max}L/\unicode[STIX]{x1D702}$ and the elasticity number $E\equiv W/Re=\unicode[STIX]{x1D706}\unicode[STIX]{x1D702}/(\unicode[STIX]{x1D70C}L^{2})$, where $W=\unicode[STIX]{x1D706}U_{max}/L$ is the Weissenberg number. Here, $\unicode[STIX

APA, Harvard, Vancouver, ISO, and other styles

50

Nan, Keyi, Zhongyan Hu, Wei Zhao, Kaige Wang, Jintao Bai, and Guiren Wang. "Large-Scale Flow in Micro Electrokinetic Turbulent Mixer." Micromachines 11, no. 9 (2020): 813. http://dx.doi.org/10.3390/mi11090813.

Full text

Abstract:

In the present work, we studied the three-dimensional (3D) mean flow field in a micro electrokinetic (μEK) turbulence based micromixer by micro particle imaging velocimetry (μPIV) with stereoscopic method. A large-scale solenoid-type 3D mean flow field has been observed. The extraordinarily fast mixing process of the μEK turbulent mixer can be primarily attributed to two steps. First, under the strong velocity fluctuations generated by μEK mechanism, the two fluids with different conductivity are highly mixed near the entrance, primarily at the low electric conductivity sides and bias to the b

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!