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Articles de revues sur le sujet « Non-simple fluid »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Zatloukal, Martin. "A simple phenomenological non-Newtonian fluid model." Journal of Non-Newtonian Fluid Mechanics 165, no. 11-12 (2010): 592–95. http://dx.doi.org/10.1016/j.jnnfm.2010.02.019.

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Teja, Amyn S., and Tongfan Sun. "A simple non-classical equation of state for fluids and fluid mixtures." Fluid Phase Equilibria 161, no. 1 (1999): 63–76. http://dx.doi.org/10.1016/s0378-3812(99)00161-2.

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ZHOU, SHIQI. "EXTENDING SIMPLE WEIGHTED DENSITY APPROXIMATION FOR HARD SPHERE FLUID TO LENNARD–JONES FLUID (I): TEST." International Journal of Modern Physics B 19, no. 32 (2005): 4701–21. http://dx.doi.org/10.1142/s0217979205033078.

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A theoretical formalism which can be combined with any hard sphere density functional approximations (DFA) to construct DFA for non-hard sphere fluids with a hard or soft core subjected to diverse external potentials is proposed. To show validity and power of the present formalism, we employ a simple weighted density approximation as an illustrating example. It is found that the resultant DFA for Lennard–Jones fluid under influences of diverse extenal potentials is in generally satisfactory agreement with corresponding simulational results even though the co-existence bulk fluid in the particl

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Payam, A. F., W. Trewby, and K. Voïtchovsky. "Simultaneous viscosity and density measurement of small volumes of liquids using a vibrating microcantilever." Analyst 142, no. 9 (2017): 1492–98. http://dx.doi.org/10.1039/c6an02674e.

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An analytical model is derived to calculate the viscosity and density of small volumes of fluid from the resonance frequencies of an immersed microcantilever. Its accuracy is verified on simple and non-Newtonian fluids.

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Fujitani, Youhei. "A Simple Formulation of Non-Equilibrium Thermodynamics of a Polarizable Fluid." Journal of the Physical Society of Japan 70, no. 6 (2001): 1556–64. http://dx.doi.org/10.1143/jpsj.70.1556.

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Dai, F., and M. M. Khonsari. "A Theory of Hydrodynamic Lubrication Involving the Mixture of Two Fluids." Journal of Applied Mechanics 61, no. 3 (1994): 634–41. http://dx.doi.org/10.1115/1.2901507.

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Based on the principles of continuum mechanics, we drive the governing equations for the hydrodynamic lubrication involving the mixture of two incompressible fluids. The governing equations are general in the sense that they can be applied to the mixture of any simple non-Newtonian fluid with a Newtonian fluid. A mixture thus formed is considered to be nonhomogeneous and non-Newtonian. In the theoretical development, the interaction between the constituents is taken into consideration. It is shown that a number of currently available models are special cases of the theory presented in this pap

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Lenci, Alessandro, and Luca Chiapponi. "An Experimental Setup to Investigate Non-Newtonian Fluid Flow in Variable Aperture Channels." Water 12, no. 5 (2020): 1284. http://dx.doi.org/10.3390/w12051284.

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Non-Newtonian fluid flow in porous and fractured media is of considerable technical and environmental interest. Here, the flow of a non-Newtonian fluid in a variable aperture fracture is studied theoretically, experimentally and numerically. We consider a shear-thinning power-law fluid with flow behavior index n. The natural logarithm of the fracture aperture is a two-dimensional, spatially homogeneous and correlated Gaussian random field. An experimental device has been conceived and realized to allow the validation of the theory, and several tests are conducted with Newtonian and shear-thinn

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H. M. Almahdawi, Faleh, Ahmed Zarzor Al-Yaseri, and Nagham Jasim. "Apparent Viscosity Direct from Marsh Funnel Test." Iraqi Journal of Chemical and Petroleum Engineering 15, no. 1 (2014): 51–57. http://dx.doi.org/10.31699/ijcpe.2014.1.6.

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Accurate and simple techniques for measurement of fluid rheological properties are important for field operations in the oil industry. Marsh Funnels are popular quality-control tools used in the field for drilling fluids and they offer a simple, practical alternative to viscosity measurement. In the normal measurements, a single point (drainage time) is used to determine an average viscosity; little additional information is extracted regarding the non-Newtonian behavior of the fluid.Here, a new model is developed and used to determine the rheological properties of drilling muds and other non-

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Ayub, Syahrial, Hikmawati Hikmawati, Ni Nyoman Sri Putu Verawati, and Muhammad Zuhdi. "PENGEMBANGAN KIT FLUIDA ALTERNATIF YANG BERASAL DARI SAMPAH ANORGANIK UNTUK PEMBELAJARAN FISIKA." ORBITA: Jurnal Kajian, Inovasi dan Aplikasi Pendidikan Fisika 5, no. 2 (2019): 59. http://dx.doi.org/10.31764/orbita.v5i2.1185.

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ABSTRAKPenelitian ini bertujuan mengembangkan kit fluida alternatif pada pembelajaran fisika. Kit fluida alternatif ini dibuat dengan memanfaatkan sampah anorganik yang sudah tidak digunakan. Sampah anorganik adalah sampah yang dihasilkan dari bahan-bahan non-hayati, baik berupa produk sintetik maupun hasil proses teknologi pengolahan bahan tambang atau sumber daya alam dan tidak dapat diuraikan oleh alam, seperti botol plastik, tas plastik, kaleng dan lain-lain. Alat-alat yang terdapat pada kit fluida alternatif adalah alat peraga kapal selam sederhana, alat peraga aliran air, alat peraga pom

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Hegaj, Efim, and Evgeny Borzenko. "Numerical Simulation of the Steady-State Herschel-Bulkley Fluid Flow in a Channel with Sudden Expansion." Key Engineering Materials 743 (July 2017): 474–79. http://dx.doi.org/10.4028/www.scientific.net/kem.743.474.

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In this paper, the steady-state flow of non-Newtonian fluid in a planar channel with sudden expansion is investigated. The rheological behavior of this media is described by the Herschel-Bulkley model. To determine both steady-state velocity and pressure fields, a numerical algorithm based on the relaxation method and SIMPLE procedure is used.The mathematical problem statement includes three non-dimensional parameters: the Reynolds number, the Bingham number (non-dimensional viscoplasticity parameter), and the power-law index. The results of numerical simulation are obtained in a range of the

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Marakana, Nirali, Jayshree Vaghani, Bhavesh Faldu, and Hansa Goswami. "EXFOLIATIVE CYTOLOGY OF SEROUS FLUIDS- AN IMPORTANT AID TO PRIMARY DIAGNOSIS." International Journal of Advanced Research 12, no. 08 (2024): 341–45. http://dx.doi.org/10.21474/ijar01/19261.

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Introduction: Body fluid cytology is an important diagnostic test for various malignant and benign conditions. Effusions can be caused by inflammatory, infectious, and benign neoplastic or malignant and primary or metastatic diseases. Such conditions in effusions may often have overlapping features and mimic one another both cytomorphologically and clinically, presenting diagnostic challenges.1 Aims and Objectives: To study tha age and gender wise distribution of cases. To the study the incidence of neoplastic and non-neoplastic lesions. To study the cytomorphology of neoplastic and non-neopla

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Rana, Mehwish, Nazish Shahid, and Azhar Ali Zafar. "Effects of Side Walls on the Motion Induced by an Infinite Plate that Applies Shear Stresses to an Oldroyd-B Fluid." Zeitschrift für Naturforschung A 68, no. 12 (2013): 725–34. http://dx.doi.org/10.5560/zna.2013-0052.

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Unsteady motions of Oldroyd-B fluids between two parallel walls perpendicular to a plate that applies two types of shears to the fluid are studied using integral transforms. Exact solutions are obtained both for velocity and non-trivial shear stresses. They are presented in simple forms as sums of steady-state and transient solutions and can easily be particularized to give the similar solutions for Maxwell, second-grade and Newtonian fluids. Known solutions for the motion over an infinite plate, applying the same shears to the fluid, are recovered as limiting cases of general solutions. Final

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Tamburrini, Stefania, Letizia Consoli, Marco Garrone, et al. "The “Black Pattern”, a Simplified Ultrasound Approach to Non-Traumatic Abdominal Emergencies." Tomography 8, no. 2 (2022): 798–814. http://dx.doi.org/10.3390/tomography8020066.

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Background: A key issue in abdominal US is the assessment of fluid, which is usually anechoic, thus appearing “black”. Our approach focuses on searching for fluid in non-traumatic patients, providing a new, simplified method for point-of-care US (POCUS). Objective: Fluid assessment is based on a three-step analysis that we can thus summarize. 1. Look for black where it should not be. This means searching for effusions or collections. 2. Check if black is too much. This means evaluating anatomical landmarks where fluid should normally be present but may be abnormally abundant. 3. Look for black

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Dostalík, Mark, Josef Málek, Vít Průša, and Endre Süli. "A Simple Construction of a Thermodynamically Consistent Mathematical Model for Non-Isothermal Flows of Dilute Compressible Polymeric Fluids." Fluids 5, no. 3 (2020): 133. http://dx.doi.org/10.3390/fluids5030133.

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We revisit some classical models for dilute polymeric fluids, and we show that thermodynamically consistent models for non-isothermal flows of these fluids can be derived in a very elementary manner. Our approach is based on the identification of energy storage mechanisms and entropy production mechanisms in the fluid of interest, which, in turn, leads to explicit formulae for the Cauchy stress tensor and for all of the fluxes involved. Having identified these mechanisms and derived the governing equations, we document the potential use of the thermodynamic basis of the model in a rudimentary

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Zhuo, Jingxuan, Ricardo Cortez, and Robert Dillon. "Lagrangian Mesh Model with Regridding for Planar Poiseuille Flow." Communications in Computational Physics 22, no. 1 (2017): 112–32. http://dx.doi.org/10.4208/cicp.oa-2016-0109.

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AbstractMany biological settings involve complex fluids that have non-Newtonian mechanical responses that arise from suspended microstructures. In contrast, Newtonian fluids are liquids or mixtures of a simple molecular structure that exhibit a linear relationship between the shear stress and the rate of deformation. In modeling complex fluids, the extra stress from the non-Newtonian contribution must be included in the governing equations.In this study we compare Lagrangian mesh and Oldroyd-B formulations of fluid-structure interaction in an immersed boundary framework. The start-up phase of

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Stankov, M. N., A. P. Jovanovic, V. Lj Markovic, and S. N. Stamenkovic. "Two-dimensional fluid modeling of DC glow discharge in argon at low pressure." Facta universitatis - series: Physics, Chemistry and Technology 13, no. 3 (2015): 153–62. http://dx.doi.org/10.2298/fupct1503153s.

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The modeling of DC glow discharge in argon at the pressure p = 1.5 Torr and inter-electrode distance d = 1 cm was performed for different voltages and glow currents. For the first time, argon glow discharge is modeled using a two-dimensional (2D) fluid model with non-local ionization. A detailed numerical procedure for 2D fluid modeling is given. The 2D profiles of particle number densities and electric potential obtained from the fluid model with non-local ionization and the simple fluid model are presented and compared.

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SASAKI, Kazuhiko, and Kazuhiko KASAI. "MACROSCOPIC AND SIMPLE NON-LINEAR MODELING OF VISCOUS FLUID MATERIAL UNDER LARGER STRAINS." Journal of Structural and Construction Engineering (Transactions of AIJ) 78, no. 685 (2013): 607–15. http://dx.doi.org/10.3130/aijs.78.607.

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Sekimoto, Ken. "An exact non-stationary solution of simple shear flow in a Bingham fluid." Journal of Non-Newtonian Fluid Mechanics 39, no. 1 (1991): 107–13. http://dx.doi.org/10.1016/0377-0257(91)80006-6.

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McKinney, Michella M., and Andrew Parkinson. "A simple, non-chromatographic procedure to purify immunoglobulins from serum and ascites fluid." Journal of Immunological Methods 96, no. 2 (1987): 271–78. http://dx.doi.org/10.1016/0022-1759(87)90324-3.

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Fetecau, Corina, Mehwish Rana, Niat Nigar, and Constantin Fetecau. "First Exact Solutions for Flows of Rate Type Fluids in a Circular Duct that Applies a Constant Couple to the Fluid." Zeitschrift für Naturforschung A 69, no. 5-6 (2014): 232–38. http://dx.doi.org/10.5560/zna.2014-0022.

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Rotational flow of an Oldroyd-B fluid induced by an infinite circular cylinder that applies a constant couple to the fluid is studied by means of integral transforms. Such a problem is not solved in the existing literature for rate type fluids and the present solutions are based on a simple but important remark regarding the governing equation for the non-trivial shear stress. The solutions that have been obtained satisfy all imposed initial and boundary conditions and can easy be reduced to the similar solutions corresponding to Maxwell, second-grade, and Newtonian fluids performing the same

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Luo, Zheng Yuan, and Bo Feng Bai. "Dynamics of capsules enclosing viscoelastic fluid in simple shear flow." Journal of Fluid Mechanics 840 (February 14, 2018): 656–87. http://dx.doi.org/10.1017/jfm.2018.88.

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Previous studies on capsule dynamics in shear flow have dealt with Newtonian fluids, while the effect of fluid viscoelasticity remains an unresolved fundamental question. In this paper, we report a numerical investigation of the dynamics of capsules enclosing a viscoelastic fluid and which are freely suspended in a Newtonian fluid under simple shear. Systematic simulations are performed at small but non-zero Reynolds numbers (i.e. $Re=0.1$) using a three-dimensional front-tracking finite-difference model, in which the fluid viscoelasticity is introduced via the Oldroyd-B constitutive equation.

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Spencer, Timothy J., Ian Halliday, and Chris M. Care. "A local lattice Boltzmann method for multiple immiscible fluids and dense suspensions of drops." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1944 (2011): 2255–63. http://dx.doi.org/10.1098/rsta.2011.0029.

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The lattice Boltzmann method (LBM) for computational fluid dynamics benefits from a simple, explicit, completely local computational algorithm making it highly efficient. We extend LBM to recover hydrodynamics of multi-component immiscible fluids, while retaining a completely local, explicit and simple algorithm. Hence, no computationally expensive lattice gradients, interaction potentials or curvatures, that use information from neighbouring lattice sites, need to be calculated, which makes the method highly scalable and suitable for high performance parallel computing. The method is analytic

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Hou, J. S., M. H. Holmes, W. M. Lai, and V. C. Mow. "Boundary Conditions at the Cartilage-Synovial Fluid Interface for Joint Lubrication and Theoretical Verifications." Journal of Biomechanical Engineering 111, no. 1 (1989): 78–87. http://dx.doi.org/10.1115/1.3168343.

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The objective of this study is to establish and verify the set of boundary conditions at the interface between a biphasic mixture (articular cartilage) and a Newtonian or non-Newtonian fluid (synovial fluid) such that a set of well-posed mathematical problems may be formulated to investigate joint lubrication problems. A “pseudo-no-slip” kinematic boundary condition is proposed based upon the principle that the conditions at the interface between mixtures or mixtures and fluids must reduce to those boundary conditions in single phase continuum mechanics. From this proposed kinematic boundary c

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Fetecau, Constantin, Costică Moroşanu, and Shehraz Akhtar. "A Strange Result Regarding Some MHD Motions of Generalized Burgers’ Fluids with a Differential Expression of Shear Stress on the Boundary." AppliedMath 4, no. 1 (2024): 289–304. http://dx.doi.org/10.3390/appliedmath4010015.

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In this work, we investigate isothermal MHD motions of a large class of rate type fluids through a porous medium between two infinite horizontal parallel plates when a differential expression of the non-trivial shear stress is prescribed on the boundary. Exact expressions are provided for the dimensionless steady state velocities, shear stresses and Darcy’s resistances. Obtained solutions can be used to find the necessary time to touch the steady state or to bring to light certain characteristics of the fluid motion. Graphical representations showed the fluid moves slower in presence of a magn

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BOMBELLI, LUCA. "PERFECT FLUID PERTURBATIONS OF ROBERTSON-WALKER SPACETIMES." International Journal of Modern Physics D 03, no. 01 (1994): 153–56. http://dx.doi.org/10.1142/s0218271894000174.

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I report on recent work on perturbations of Robertson-Walker spacetimes using the Bardeen-Stewart variables to describe metric perturbations. The gauge freedom available in the formalism is larger than that arising purely from spacetime diffeomorphisms. The associated non-uniqueness and non-locality problems have a simple solution, but the extra gauge freedom must be taken into account to obtain deterministic linearized field equations. The linearized Einstein equation decouples into scalar, vector and tensor sectors; I write down and comment on the equations one obtains using as matter an ise

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Tamburrino, Aldo, and Yarko Niño. "The Universal Presence of the Reynolds Number." Fluids 10, no. 5 (2025): 117. https://doi.org/10.3390/fluids10050117.

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The Reynolds number is a fundamental parameter in fluid dynamics, initially introduced by O. Reynolds in 1883 to characterize the transition between laminar and turbulent flow in fluids and necessary in the scaling of viscous resistance. Over time, its application has expanded significantly, becoming essential for studying a vast range of fluid phenomena—from microscopic scales such as cellular motion to macroscopic scales like turbulent flows and even intergalactic dynamics. The article highlights the universal relevance of the Reynolds number across various fields, including its adaptation t

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Tripathi, M. K., K. C. Sahu, G. Karapetsas, K. Sefiane, and O. K. Matar. "Non-isothermal bubble rise: non-monotonic dependence of surface tension on temperature." Journal of Fluid Mechanics 763 (December 10, 2014): 82–108. http://dx.doi.org/10.1017/jfm.2014.659.

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AbstractWe study the motion of a bubble driven by buoyancy and thermocapillarity in a tube with a non-uniformly heated walls, containing a so-called ‘self-rewetting fluid’; the surface tension of the latter exhibits a parabolic dependence on temperature, with a well-defined minimum. In the Stokes flow limit, we derive the conditions under which a spherical bubble can come to rest in a self-rewetting fluid whose temperature varies linearly in the vertical direction, and demonstrate that this is possible for both positive and negative temperature gradients. This is in contrast to the case of sim

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Gagnon, D. A., and P. E. Arratia. "The cost of swimming in generalized Newtonian fluids: experiments with C. elegans." Journal of Fluid Mechanics 800 (July 14, 2016): 753–65. http://dx.doi.org/10.1017/jfm.2016.420.

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Numerous natural processes are contingent on microorganisms’ ability to swim through fluids with non-Newtonian rheology. Here, we use the model organism Caenorhabditis elegans and tracking methods to experimentally investigate the dynamics of undulatory swimming in shear-thinning fluids. Theory and simulation have proposed that the cost of swimming, or mechanical power, should be lower in a shear-thinning fluid compared to a Newtonian fluid of the same zero-shear viscosity. We aim to provide an experimental investigation into the cost of swimming in a shear-thinning fluid from (i) an estimate

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Walicka, A., P. Jurczak, and J. Falicki. "Curvilinear Squeeze Film Bearing Lubricated with a Dehaven Fluid or with Similar Fluids." International Journal of Applied Mechanics and Engineering 22, no. 3 (2017): 697–715. http://dx.doi.org/10.1515/ijame-2017-0044.

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AbstractIn the paper, the model of a DeHaven fluid and some other models of non-Newtonian fluids, in which the shear strain rates are known functions of the powers of shear stresses, are considered. It was demonstrated that these models for small values of material constants can be presented in a form similar to the form of a DeHaven fluid. This common form, called a unified model of the DeHaven fluid, was used to consider a curvilinear squeeze film bearing. The equations of motion of the unified model, given in a specific coordinate system are used to derive the Reynolds equation. The solutio

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Fetecau, Constantin, Tahir Mushtaq Qureshi, Abdul Rauf, and Dumitru Vieru. "On the Modified Stokes Second Problem for Maxwell Fluids with Linear Dependence of Viscosity on the Pressure." Symmetry 14, no. 2 (2022): 219. http://dx.doi.org/10.3390/sym14020219.

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The modified Stokes second problem for incompressible upper-convected Maxwell (UCM) fluids with linear dependence of viscosity on the pressure is analytically and numerically investigated. The fluid motion, between infinite horizontal parallel plates, is generated by the lower wall, which oscillates in its plane. The movement region of the fluid is symmetric with respect to the median plane, but its motion is asymmetric due to the boundary conditions. Closed-form expressions are found for the steady-state components of start-up solutions for non-dimensional velocity and the corresponding non-t

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Švec, Oldřich, and Jan Skoček. "Simple Navier’s slip boundary condition for the non-Newtonian Lattice Boltzmann fluid dynamics solver." Journal of Non-Newtonian Fluid Mechanics 199 (September 2013): 61–69. http://dx.doi.org/10.1016/j.jnnfm.2013.06.003.

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Ren, Zhongfu, Fanzhi Kong, Yongxiang Kang, and Haiyan Kong. "Thermal and hydrodynamic performance analysis of charged jet in electrospinning." International Journal of Numerical Methods for Heat & Fluid Flow 24, no. 6 (2014): 1260–67. http://dx.doi.org/10.1108/hff-01-2013-0028.

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Purpose – The purpose of this paper is to theoretically investigate the thermal and hydrodynamic performance of the flow pattern of fluid in the charged jet. The flow pattern includes laminar flow in which all fluid layers move at different accelerated speeds, and shear forces between the fluid layers give rise to friction forces. This is a favorable condition for the parallel arrangement of the branches on polymer molecules. Design/methodology/approach – The dynamic mechanism of the flow pattern is conducted through analyzing the forces acting on the charged jet. The differential equation obt

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Samad, Abdus, A. Husain, M. Zunaid, and A. Samad. "Newtonian and Non-Newtonian Pulsatile Flows through an Artery with Stenosis." Journal of Engineering Research [TJER] 14, no. 2 (2017): 191. http://dx.doi.org/10.24200/tjer.vol14iss2pp191-205.

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The current study presents three-dimensional modeling and analysis of blood flow through artery stenosis under several variants of pulsatile flow to mimic the atherosclerosis artery disease. The study considered Newtonian and non-Newtonian blood flow models and solved the three-dimensional laminar and unsteady Navier-Stokes (NS) equations for different inlet velocity profiles. The Carreau Yasuda model was used for hemodynamics modeling of fluid viscosity. A comparative analysis was carried out for Newtonian and non-Newtonian fluid models under several simple pulsatile, equivalent pulsatile and

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Shaukin, Shilpi, Satosh U. Kafle, and Mrinalini Singh. "Spectrum of Exfoliative Cytology at Birat Medical College and Teaching Hospital." Birat Journal of Health Sciences 4, no. 2 (2019): 734–37. http://dx.doi.org/10.3126/bjhs.v4i2.25456.

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Introduction: Exfoliative cytological study of body fluids is easy, simple, rapid, cost effective and patient compliant investigation that helps in characterizing the disease into their varying subtypes. These presumptive and sometimes definitive diagnoses are in most cases the cornerstone which helps in staging and prognosis of the patient Objective: To determine the spectrum of malignant and non-malignant lesions in exfoliative cytology Methodology: This was a quantitative retrospective cross sectional study conducted at Birat Medical College Teaching Hospital from 24th December

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Dupuy, Hélène. "Non-linear description of massive neutrinos in the framework of large-scale structure formation." Proceedings of the International Astronomical Union 11, S308 (2014): 121–24. http://dx.doi.org/10.1017/s174392131600973x.

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AbstractThere is now no doubt that neutrinos are massive particles fully involved in the non-linear growth of the large-scale structure of the universe. A problem is that they are particularly difficult to include in cosmological models because the equations describing their behavior in the non-linear regime are cumbersome and difficult to handle. In this manuscript I present a new method allowing to deal with massive neutrinos in a very simple way, based on basic conservation laws. This method is still valid in the non-linear regime. The key idea is to describe neutrinos as a collection of si

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Maharjan, Sushana, Sabin Ranabhat, Mamata Tiwari, Anita Bhandari, Bidur Prasad Osti, and Puja Neopane. "Exfoliative cytology analysis from different sites of the body." Journal of Chitwan Medical College 7, no. 2 (2017): 33–39. http://dx.doi.org/10.3126/jcmc.v7i2.23674.

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Background: Cytological study of body fluids a non-invasive, simple procedure, relatively inexpensive, and helps in faster reporting that has high population acceptance. The present study aims to determine the proportion of malignant and non malignant lesions. Methods: A total of 1129 specimens of exfoliative cytology were examined during the period over five years from year January 2011 to December 2016 at Department of Pathology at Chitwan Medical College Teaching Hospital, Nepal. The fluid received was centrifuged at 3000 revolutions per minute for five minutes. Smears were made from

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Mikielewicz, Dariusz, and Jarosław Mikielewicz. "Criteria for selection of working fluid in low-temperature ORC." Chemical and Process Engineering 37, no. 3 (2016): 429–40. http://dx.doi.org/10.1515/cpe-2016-0035.

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Abstract The economics of an ORC system is strictly linked to thermodynamic properties of the working fluid. A bad choice of working fluid could lead to a less efficient and expensive plant/generation unit. Some selection criteria have been put forward by various authors, incorporating thermodynamic properties, provided in literature but these do not have a general character. In the paper a simple analysis has been carried out which resulted in development of thermodynamic criteria for selection of an appropriate working fluid for subcritical and supercritical cycles. The postulated criteria a

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Kuwahara, T., H. Yamaguchi, and F. De Vuyst. "Flow regime discrimination technique for gas—liquid two-phase flow in magnetic fluid." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 6 (2008): 935–44. http://dx.doi.org/10.1243/09544062jmes491.

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This paper describes a new discrimination technique of flow regime (flow pattern) for gas—liquid two-phase flow in magnetic fluid. The proposed technique can identify the flow regime with simple devices by exploiting the wave patterns of signals obtained by electromagnetic induction. This utilization achieves a mechanically non-contact measuring method for objective fluids. In this study, verification experiments for practical measurement were conducted in upward gas—liquid two-phase flow. The results of the experiments have verified that the proposed measuring technique is useful as a method

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Bojko, Marian, Sylva Drábková, Josef Veselý, and Rostislav Zapletal. "Numerical modelling of a non-Newtonian fluid in the twin-screw pump." EPJ Web of Conferences 269 (2022): 01005. http://dx.doi.org/10.1051/epjconf/202226901005.

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Twin screw pump is a positive displacement pump, which is widely used in numerous type of foodstuff applications. Numerical CFD analysis presented in this paper focuses on the investigation of the influence of the clearances and the non-Newtonian behaviour of the fluid. The pump operates at low rotational speed and low inlet pressure. As the first step 3D CFD simulation of twin-screw pump non-rotating segment has been carried out using static mesh without rotation. Various empirical equations have been applied to represent the viscosity relations for non-Newtonian fluid in simple shear. The re

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Vu, Truong V., Vinh T. Nguyen, Phan H. Nguyen, et al. "Dynamics of a contracting fluid compound filament with a variable density ratio." Science and Technology Development Journal 24, no. 2 (2021): first. http://dx.doi.org/10.32508/stdj.v24i2.2515.

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Introduction: Compound fluid filaments appear in many applications, e.g., drug delivery and processing or microfluidic systems. This paper focuses on the numerical simulation of an incompressible, immiscible, and Newtonian fluid for the contraction process of a fluid compound filament by solving the Navier-Stokes equations. The front-tracking method is used to solve this problem, which uses connected segments (Lagrangian grid) that move on a fixed grid (Eulerian grid) to represent the interface between the liquids. Methods: The interface points are advected by the velocity interpolated f

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Bourgin, Patrick, and Joseph-Marc Francois. "A Simple Approach to Evaluate Non-Newtonian Viscosity Effects in a Lubricating System." Journal of Tribology 109, no. 1 (1987): 177–82. http://dx.doi.org/10.1115/1.3261314.

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The working characteristics of a finite width slider bearing lubricated by a non-Newtonian fluid are computed. The analysis proposed here allows its performances to be evaluated by means of a pocket calculator. For that purpose, a computer code based on a finite element method is used. The program runs for different values of pertinent kinematical, geometrical and rheological parameters. The corresponding results are fitted by means of adequate analytical formulas, which are very easy to handle. The accuracy of these empirical formulas is investigated in several typical cases. The agreement wi

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Dirks, Jan-Henning. "Physical principles of fluid-mediated insect attachment - Shouldn’t insects slip?" Beilstein Journal of Nanotechnology 5 (July 28, 2014): 1160–66. http://dx.doi.org/10.3762/bjnano.5.127.

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Insects use either hairy or smooth adhesive pads to safely adhere to various kinds of surfaces. Although the two types of adhesive pads are morphologically different, they both form contact with the substrate via a thin layer of adhesive fluid. To model adhesion and friction forces generated by insect footpads often a simple “wet adhesion” model is used, in which two flat undeformable substrates are separated by a continuous layer of fluid. This review summarizes the key physical and tribological principles that determine the adhesion and friction in such a model. Interestingly, such a simple

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MENDONÇA, J. T., A. SERBETO, and S. ALI. "Effective charge of photons and plasmons." Journal of Plasma Physics 76, no. 3-4 (2010): 287–92. http://dx.doi.org/10.1017/s002237780999047x.

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AbstractWe review the concept of photon effective charge in a plasma, and extend it to the case of longitudinal photons or plasmons. A simple electrostatic fluid model is considered in a non-magnetized and non-relativistic plasma. The contribution of the ions to the plasmon charge is also considered.

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Shi, Y., and G. H. Tang. "Lattice Boltzmann Simulation of Droplet Formation in Non-Newtonian Fluids." Communications in Computational Physics 17, no. 4 (2015): 1056–72. http://dx.doi.org/10.4208/cicp.2014.m333.

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AbstractNewtonian and non-Newtonian dispersed phase droplet formation in non-Newtonian continuous phase in T-junction and cross junction microchannels are investigated by the immiscible lattice BGK model. The effects of the non-Newtonian fluid power-law exponent, viscosity and interfacial tension on the generation of the droplet are studied. The final droplet size, droplet generation frequency, and detachment point of the droplet change with the power-law exponent. The results reveal that it is necessary to take into account the non-Newtonian rheology instead of simple Newtonian fluid assumpti

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Chandan, Dr Rajesh h., Dr Sumana Pawar, and Dr Purushotham Redd. "Analysis of diagnostic value of cytological smear method versus cell block method in body fluids with clinical and biochemical correlation: study of 150 cases." Tropical Journal of Pathology and Microbiology 7, no. 1 (2021): 9–16. http://dx.doi.org/10.17511/jopm.2021.i01.02.

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Background: Aspiration of serous cavities is a simple and relatively non-invasive technique toachieve diagnosis. Cytological evaluation of body cavity fluid is diagnostically challenging. Especiallyin malignant effusions, helps in staging, prognosis and management of the patients. Aims: Toassess the utility and sensitivity of cell block method over conventional smear technique incytodiagnosis of the serous effusions. And to assess the utility and sensitivity of cytologicalevaluation of body fluids with biochemical and clinical correlation. Methods: A total of 150 fluidspecimens were examined f

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Dirks, Jan-Henning, and Walter Federle. "Mechanisms of fluid production in smooth adhesive pads of insects." Journal of The Royal Society Interface 8, no. 60 (2011): 952–60. http://dx.doi.org/10.1098/rsif.2010.0575.

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Insect adhesion is mediated by thin fluid films secreted into the contact zone. As the amount of fluid affects adhesive forces, a control of secretion appears probable. Here, we quantify for the first time the rate of fluid secretion in adhesive pads of cockroaches and stick insects. The volume of footprints deposited during consecutive press-downs decreased exponentially and approached a non-zero steady state, demonstrating the presence of a storage volume. We estimated its size and the influx rate into it from a simple compartmental model. Influx was independent of step frequency. Fluid-depl

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Evans, D. J., and P. T. Cummings. "Non-equilibrium molecular dynamics algorithm for the calculation of thermal diffusion in simple fluid mixtures." Molecular Physics 72, no. 4 (1991): 893–98. http://dx.doi.org/10.1080/00268979100100621.

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Czerwiński, Andrzej, and Jan Łuczko. "Non-planar vibrations of slightly curved pipes conveying fluid in simple and combination parametric resonances." Journal of Sound and Vibration 413 (January 2018): 270–90. http://dx.doi.org/10.1016/j.jsv.2017.10.026.

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Evans, C. R., and K. L. Johnson. "The Rheological Properties of Elastohydrodynamic Lubricants." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 200, no. 5 (1986): 303–12. http://dx.doi.org/10.1243/pime_proc_1986_200_134_02.

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The methods of measuring the rheological properties of EHD lubricants are reviewed, but for pressures in excess of 1.0 GPa there is currently no simple alternative to the disc machine. A technique has been developed which enables disc machine traction tests to be carried out at constant mean film temperature. Isothermal tests provide further evidence for the existence of a limiting shear stress τc at which the fluid shears in the manner of a plastic solid. At stresses below this limit the experimental data are found to be in very good accord with the non-linear Maxwell rheological model based

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Zar, Chi Soe, and Thae Ei Aung Thae. "Color and Height Control of Fluid Mixing System Using Fuzzy Logic." International Journal of Trend in Scientific Research and Development 2, no. 5 (2018): 2184–89. https://doi.org/10.31142/ijtsrd18260.

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This paper presents a qualitative control of a fluid mixer, which is a non linear plant. The mixer has as inputs two fluids of the resulting mix. The control system consists of two independent fuzzy controllers which are responsible for maintaining the water level at a given height and for adjusting the color of the fluid in the mixing tank. The main points studied are response when the desired color is changed and when the output flow changes. Simulation results show that approach of using two independent controllers, with simple rule bases, can give good results. The simulation of fuzzy logi

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