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Author : Mark Milton Weislogel
Publisher :
ISBN 13 :
Total Pages : 104 pages
Book Rating : 4.:/5 (317 download)
Download or read book Capillary Flow in an Interior Corner written by Mark Milton Weislogel and published by . This book was released on 1996 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mark M. Weislogel
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (844 download)
Download or read book Capillary Flow in an Interior Corner written by Mark M. Weislogel and published by . This book was released on 1996 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cory L. Nardin
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.:/5 (621 download)
Download or read book Computation of Capillary Flow in Interior Corners written by Cory L. Nardin and published by . This book was released on 2005 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ben Semerjian
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.:/5 (464 download)
Download or read book Capillary Flow in Interconnected Interior Corners and Other Exciting Adventures written by Ben Semerjian and published by . This book was released on 2009 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 107 pages
Book Rating : 4.:/5 (128 download)
Download or read book An Analysis of Capillary Flow in Finite Length Interior Corners written by and published by . This book was released on 2021 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: We analyze the mathematical robustness of slow massively parallel interior corner flows in low gravity environments. An interior corner provides a preferential orientation in low gravity environments. This is a luxury usually only found on earth. It also provides a passive pumping mechanism due to geometry of a conduit. The driving force for this flow is a pressure difference due to local surface curvature gradients. An alternative reasoning is that due to the geometrical constraints the interior corner surface energy is unbounded below. This results in the liquid wicking into corners indefinitely. Interior corner flow's main quantity of interest is the meniscus height h(z,t). With this variable one can calculate an average velocity w̄, flow rate Q, and volume of liquid in the corner V. Our study is different from most as it is highly in-depth look at finite domains, while the majority of previous solutions focus on similarity solutions of infinite, or semi-infinite domains. Boundary conditions, more specifically the functions that are assigned to the governing equation, play an integral role to meniscus height. We study a simplified problem of corners initially filled with quiescent liquid at t = 0, and boundary conditions are instantaneously applied when t > 0. Approximate asymptotic expressions are found for this process, but more importantly a method of approximating nonlinear heat equations as a sequence of linear heat equations is proved as a viable method for engineering purposes. Time varying boundary conditions are analyzed using a method of model-approximation. This is where we simply remove the nonlinearity of the governing equation and insert a fitting term n. The method works surprising well for a range of constant and time varying boundary conditions. In all cases the relative error between solutions is less than 10%. This is a major theme of the thesis, that is, force initial value boundary value problems to be linear via a substitution and achieve results sufficient for engineering analysis. For parallel corners, volume can transfer between corners in a multiple corner system. This motivates formulating an ODE governing the average height H(t) instead of meniscus height h(z,t). We formulate an N corner start-up problem similar to the analysis of a single corner. This solution is only true for a quasi-steady process for creeping flows. In order to feed a corner fluid, manifold tubing is required. Tubing presents a drastic geometrical difference where manifold resistance is much greater then the corner. This means for parallel flows that the dynamics of the system is governed by the transients introduced by the corner's ability to store volume. Real world system fluid properties can vary from temperature, concentration, and other gradients. These effects alter the meniscus height. We consider temperature and concentration gradients which add additional terms to the spatial derivative side of the equation. The property variation is captured by only three axial location-dependent coefficient functions. Finally, corners that are pinned along the top edge are shown to have a governing equation with a similar form to meniscus height h(z,t) equation. The simplifications used to establish analytical results can also be utilized for numerical solutions, difference being that the new quantity of interest is now the axially-dependent contact angle function [theta](z,t), which is now free to pivot about the top edge of the groove.
Author :
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (964 download)
Download or read book Analysis of Capillary Flow in Interior Corners written by and published by . This book was released on 2015 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of fluid management systems requires accurate models for fluid transport. In the low gravity environment of space, gravity no longer dominates fluid displacement; instead capillary forces often govern flow. This thesis considers the redistribution of fluid along an interior corner. Following a rapid reduction of gravity, fluid advances along the corner measured by the column length z = L(t), which is governed by a nonlinear partial differential equation with dynamical boundary conditions. Three flow types are examined: capillary rise, spreading drop, and tapered corner. The spreading drop regime is shown to exhibit column length growth L ~ t^(2/5), where a closed form analytic solution exists. No analytic solution is available for the capillary rise problem. However, a perturbed power law similarity solution is pursued to approximate an analytic solution in the near neighborhood of the exact solution for the spreading drop. It is recovered that L ~ t^(1/2) for the capillary rise problem. The tapered corner problem is not analytically understood and hence its corresponding L is undocumented. Based on the slender corner geometry, it is natural to hypothesize the tapered corner column length initially behaves like the capillary rise regime, but after sufficient time has elapsed, it transitions into the spreading drop regime. This leads to a conjecture that its column length growth L is restricted to t^(2/5)
Author : Limin Qiu
Publisher : Springer Nature
ISBN 13 : 9819961289
Total Pages : 1176 pages
Book Rating : 4.8/5 (199 download)
Download or read book Proceedings of the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022 written by Limin Qiu and published by Springer Nature. This book was released on 2023-11-01 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected papers from the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022 (ICEC28-ICMC 2022), held virtually in Hangzhou, China on 25-29 April 2022, due to COVID-19 pandemic. Highlighting the latest findings on cryogenic engineering and cryogenic materials, it covers topics including: large-scale cryogenic components, processes and systems for refrigeration, separation, and liquefaction of cryogenic fluids, small-scale cryocoolers, cryogenic space applications, thermal insulation, thermal-physical properties of cryogenic fluids and materials, superconducting materials, devices, systems and applications, etc. The book offers valuable information and insights for academic researchers, engineers in the industry, and operators in the cryogenic field.
Author :
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)
Download or read book Capillary Flow in Containers of Polygonal Section: Theory and Experiment written by and published by . This book was released on 2001 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Eric L. Golliher
Publisher : BiblioGov
ISBN 13 : 9781289249434
Total Pages : 34 pages
Book Rating : 4.2/5 (494 download)
Download or read book Capillary Driven Flows Along Differentially Wetted Interior Corners written by Eric L. Golliher and published by BiblioGov. This book was released on 2013-07 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closed-form analytic solutions useful for the design of capillary flows in a variety of containers possessing interior corners were recently collected and reviewed. Low-g drop tower and aircraft experiments performed at NASA to date show excellent agreement between theory and experiment for perfectly wetting fluids. The analytical expressions are general in terms of contact angle, but do not account for variations in contact angle between the various surfaces within the system. Such conditions may be desirable for capillary containment or to compute the behavior of capillary corner flows in containers consisting of different materials with widely varying wetting characteristics. A simple coordinate rotation is employed to recast the governing system of equations for flows in containers with interior corners with differing contact angles on the faces of the corner. The result is that a large number of capillary driven corner flows may be predicted with only slightly modified geometric functions dependent on corner angle and the two (or more) contact angles of the system. A numerical solution is employed to verify the new problem formulation. The benchmarked computations support the use of the existing theoretical approach to geometries with variable wettability. Simple experiments to confirm the theoretical findings are recommended. Favorable agreement between such experiments and the present theory may argue well for the extension of the analytic results to predict fluid performance in future large length scale capillary fluid systems for spacecraft as well as for small scale capillary systems on Earth.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720413301
Total Pages : 32 pages
Book Rating : 4.4/5 (133 download)
Download or read book Capillary Driven Flows Along Differentially Wetted Interior Corners written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closed-form analytic solutions useful for the design of capillary flows in a variety of containers possessing interior corners were recently collected and reviewed. Low-g drop tower and aircraft experiments performed at NASA to date show excellent agreement between theory and experiment for perfectly wetting fluids. The analytical expressions are general in terms of contact angle, but do not account for variations in contact angle between the various surfaces within the system. Such conditions may be desirable for capillary containment or to compute the behavior of capillary corner flows in containers consisting of different materials with widely varying wetting characteristics. A simple coordinate rotation is employed to recast the governing system of equations for flows in containers with interior corners with differing contact angles on the faces of the corner. The result is that a large number of capillary driven corner flows may be predicted with only slightly modified geometric functions dependent on corner angle and the two (or more) contact angles of the system. A numerical solution is employed to verify the new problem formulation. The benchmarked computations support the use of the existing theoretical approach to geometries with variable wettability. Simple experiments to confirm the theoretical findings are recommended. Favorable agreement between such experiments and the present theory may argue well for the extension of the analytic results to predict fluid performance in future large length scale capillary fluid systems for spacecraft as well as for small scale capillary systems on Earth.Golliher, Eric L. (Technical Monitor) and Nardin, C. L. and Weislogel, M. M.Glenn Research CenterCAPILLARY FLOW; CORNERS; MICROGRAVITY; WETTING; FLUID DYNAMICS; ROTATION; DROP TOWERS; CROSS FLOW; LAMINAR FLOW
Author : Thierry Ondarçuhu
Publisher : CRC Press
ISBN 13 : 9814316458
Total Pages : 782 pages
Book Rating : 4.8/5 (143 download)
Download or read book Nanoscale Liquid Interfaces written by Thierry Ondarçuhu and published by CRC Press. This book was released on 2013-04-17 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the recent developments in the investigation and manipulation of liquids at the nanoscale. This new field has shown important breakthroughs on the basic understanding of physical mechanisms involving liquid interfaces, which led to applications in nanopatterning. It has also consequences in force microscopy imaging in liquid environment. The book proposes is a timely review of these various aspects. It is co-authored by 25 among the most prominent scientists in the field.
Author : Rui Wu
Publisher : CRC Press
ISBN 13 : 1000763404
Total Pages : 213 pages
Book Rating : 4.0/5 (7 download)
Download or read book Mass Transfer Driven Evaporation From Capillary Porous Media written by Rui Wu and published by CRC Press. This book was released on 2022-11-09 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mass Transfer–Driven Evaporation from Capillary Porous Media offers a comprehensive review of mass transfer–driven drying processes in capillary porous media, including pore-scale and macro-scale experiments and models. It covers kinetics of drying of a single pore, pore-scale experiments and models, macro-scale experiments and models, and understanding of the continuum model from pore-scale studies. The book: Explains the detailed transport processes in porous media during drying. Introduces cutting-edge visualization experiments of drying in porous media. Describes the pore network models of drying in porous media. Discusses the continuum models of drying in porous media based on pore-scale studies. Points out future research opportunities. Aimed at researchers, students and practicing engineers, this work provides vital fundamental and applied information to those working in drying technology, food processes, applied energy, and mechanical and chemical engineering.
Author : Yulii D. Shikhmurzaev
Publisher : CRC Press
ISBN 13 : 1584887494
Total Pages : 478 pages
Book Rating : 4.5/5 (848 download)
Download or read book Capillary Flows with Forming Interfaces written by Yulii D. Shikhmurzaev and published by CRC Press. This book was released on 2007-09-14 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Capillary Flows with Forming Interfaces explores numerous theoretical problems that arise in the mathematical description of capillary flows. It focuses on developing a unified approach to a variety of seemingly very different capillary flows of practical importance where classical fluid mechanics leads to nonphysical results. The book begin
Author : Girma Biresaw
Publisher : CRC Press
ISBN 13 : 1000022447
Total Pages : 245 pages
Book Rating : 4.0/5 ( download)
Download or read book Surfactants in Tribology, Volume 6 written by Girma Biresaw and published by CRC Press. This book was released on 2019-07-11 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surfactants play a critical role in Tribology controlling friction, wear, and lubricant properties such as emulsification, demulsification, bioresistance, oxidation resistance, rust prevention and corrosion resistance. This is a critical topic for new materials and devices particularly those built at the nanoscale. This newest volume will address important advances, methods, and the use of novel materials to reduce friction and wear. Scientists from industrial research and development (R&D) organizations and academic research teams in Asia, Europe, the Middle East and North America will participate in the work.
Author : Jean Berthier
Publisher : John Wiley & Sons
ISBN 13 : 1118720865
Total Pages : 331 pages
Book Rating : 4.1/5 (187 download)
Download or read book Open Microfluidics written by Jean Berthier and published by John Wiley & Sons. This book was released on 2016-07-11 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: Open microfluidics or open-surface is becoming fundamental in scientific domains such as biotechnology, biology and space. First, such systems and devices based on open microfluidics make use of capillary forces to move fluids, without any need for external energy. Second, the "openness" of the flow facilitates the accessibility to the liquid in biotechnology and biology, and reduces the weight in space applications. This book has been conceived to give the reader the fundamental basis of open microfluidics. It covers successively The theory of spontaneous capillary flow, with the general conditions for spontaneous capillary flow, and the dynamic aspects of such flows. The formation of capillary filaments which are associated to small contact angles and sharp grooves. The study of capillary flow in open rectangular, pseudo-rectangular and trapezoidal open microchannels. The dynamics of open capillary flows in grooves with a focus on capillary resistors. The case of very viscous liquids is analyzed. An analysis of suspended capillary flows: such flows move in suspended channels devoid of top cover and bottom plate. Their accessibility is reinforced, and such systems are becoming fundamental in biology. An analysis of “rails” microfluidics, which are flows that move in channels devoid of side walls. This geometry has the advantage to be compatible with capillary networks, which are now of great interest in biotechnology, for molecular detection for example. Paper-based microfluidics where liquids wick flat paper matrix. Applications concern bioassays such as point of care devices (POC). Thread-based microfluidics is a new domain of investigation. It is seeing presently many new developments in the domain of separation and filtration, and opens the way to smart bandages and tissue engineering. The book is intended to cover the theoretical aspects of open microfluidics, experimental approaches, and examples of application.
Author : D. Langbein
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (317 download)
Download or read book Dynamics of Liquids in Edges and Corners (DYLCO): IML-2 Experiment for the BDPU written by D. Langbein and published by . This book was released on 1998 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jörg Klatte
Publisher : Cuvillier Verlag
ISBN 13 : 3736939930
Total Pages : 164 pages
Book Rating : 4.7/5 (369 download)
Download or read book Capillary Flow and Collapse in Wedge-Shaped Channels written by Jörg Klatte and published by Cuvillier Verlag. This book was released on 2012-01-16 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The forced, isothermal, and incompressible capillary channel flow has been studied theoretically, experimentally, and numerically in this work using the example of an open wedge-shaped channel with a finite length. The curvature of the interface at the open side of the channel is coupled to the pressure difference between the surrounding gas pressure and liquid pressure along the flow path, and thus, a flow rate limit exists, above which the interface collapses. This work investigates this collapse phenomenon as a function of the channel geometry. The derivation of a one-dimensional differential flow equation is based on the streamline theory. The local pressure loss and both principal mean radii of curvature at the free surface are considered. To approximate the local pressure loss, the fully-developed flow profiles were compared to the three-dimensional numerical flow profiles. The physical understanding of the collapse behavior is generalized with the detection of a second characteristic collapse phenomena. In the inertial limit, the interface chokes at the smallest cross-section. In the viscous limit, the interface collapses at the outlet. A dimensionless number has been introduced, which classifies the inertial and viscous regime. Three numerical methods are presented to solve the capillary flow problems. The first method is a fast numerical tool for design and parametric studies of steady capillary flows. The second numerical approach solves the complete three-dimensional equation system for validation of the theoretical assumptions and time-dependent flows. The third method is specialist and solves the governing one-dimensional equations within seconds. Unique experimental data for inertia dominated flow has been recorded using the microgravity environment of a drop tower. The steady flow configuration, the transient reorientation behavior of the interface, and the collapse behavior have been observed. Additional terrestrial experiments study the hydrostatic influence. The experimental results validate the theoretical work and benchmark the numerical codes. The evaluation of a three-dimensional numerical parametric study reveals the desired velocity scale for the critical flow rate in the inertial and viscous regime. The study improves the physical understanding of such capillary corner flows, which is beneficial for liquid management in space as well as for the development of microfluidic applications on the ground.
