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Numerical Solution For Turbulent Film Condensation From Vapor Gas Mixtures In Vertical Tubes
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Book Synopsis Numerical Solution for Turbulent Film Condensation from Vapor-gas Mixtures in Vertical Tubes by : Meghan K. Groff
Download or read book Numerical Solution for Turbulent Film Condensation from Vapor-gas Mixtures in Vertical Tubes written by Meghan K. Groff and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Modeling of Condensation from Vapor-gas Mixtures for Forced Down Flow Inside a Tube by :
Download or read book Numerical Modeling of Condensation from Vapor-gas Mixtures for Forced Down Flow Inside a Tube written by and published by . This book was released on 1995 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Laminar film condensation is the dominant heat transfer mode inside tubes. In the present paper direct numerical simulation of the detailed transport process within the steam-gas core flow and in the condensate film is carried out. The problem was posed as an axisymmetric two dimensional (r, z) gas phase inside an annular condensate film flow with an assumed smooth interface. The fundamental conservation equations were written for mass, momentum, species concentration and energy in the gaseous phase with effective diffusion parameters characterizing the turbulent region. The low Reynolds number two equation [kappa]-[epsilon] model was employed to determine the eddy diffusion coefficients. The liquid film was described by similar formulation without the gas species equation. An empirical correlation was employed to correct for the effect of film waviness on the interfacial shear. A computer code named COAPIT (Condensation Analysis Program Inside Tube) was developed to implement numerical solution of the fundamental equations. The equations were solved by a marching technique working downstream from the entrance of the condensing section. COAPIT was benchmarked against experimental data and overall reasonable agreement was found for the key parameters such as heat transfer coefficient and tube inner wall temperature. The predicted axial development of radial profiles of velocity, composition and temperature and occurrence of metastable vapor add insight to the physical phenomena.
Book Synopsis Physically Based Closed-form Solutions for Film Condensation of Pure Vapors in Vertical Tubes by : Quang Tan Le
Download or read book Physically Based Closed-form Solutions for Film Condensation of Pure Vapors in Vertical Tubes written by Quang Tan Le and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Methods in Multiphase Flow VI by : Andrea Alberto Mammoli
Download or read book Computational Methods in Multiphase Flow VI written by Andrea Alberto Mammoli and published by WIT Press. This book was released on 2011 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiphase flows, which can involve compressible or incompressible linear or nonlinear, fluids, Are found in all areas of technology, at all length scales and flow regimes. In spite of their ubiquitousness, however multiphase flow continues to be one of the most challenging areas of computational mechanics and experimental methods, with numerous problems remaining unsolved to date. Because the multiphase flow problems are so complex, advanced computational and experimental methods are often required to solve the equations that describe them. The many hhallenges include modelling nonlinear fluids, modelling and tracking interfaces, dealing with multiple length scales, characterizing phase structures, and treating drop breakup and coalescence. Models must be validated, which requires the use of expensive and difficult experimental techniquess. This book presents contributions on the latest research in these techniques, presented at the sixth in a biennial series of conferences on the subject that begain in 2001. Featured topics include: Bubble and drop dynamics, Flow in porous media, Turbulent flow, Multiphase flow simulation, Image processing, Heat transfer, Interaction of gases, liquids and solids, Interface behaviour, Small scale phenomena, Atomization processes, and Liquid film behaviour.
Book Synopsis Condensation from Vapor-gas Mixture for Forced Downflow Inside a Tube by : Ruey Yng Yuann
Download or read book Condensation from Vapor-gas Mixture for Forced Downflow Inside a Tube written by Ruey Yng Yuann and published by . This book was released on 1993 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Solution of a Two-phase Model for Laminar Film Condensation of Vapour-gas Mixtures in Channels by :
Download or read book Numerical Solution of a Two-phase Model for Laminar Film Condensation of Vapour-gas Mixtures in Channels written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present analysis deals with steady-state, internal-flow, laminar film condensation of vapour-gas mixtures in horizontal and downward-inclined parallel-plate channels. The cooled lower plate is maintained at a uniform temperature, while the upper plate is insulated. Saturated vapour mixed with a non-condensable gas enters the channel at prescribed pressure, velocity, and gas mass fraction. As a result of condensation on the lower plate, distinct regions of liquid condensate and vapour-gas mixture are formed inside the channel. Each phase is described with a set of complete boundary layer equations governing the conservation of mass, momentum, and energy. These two phases are related at the interface with the continuity of velocity, temperature, mass flux, shear stress, and heat flux. The focus of this thesis is on developing a robust numerical solution for the above model and assessing the effect of each independent parameter on the condensation process. The numerical approach utilized a variable-properties finite-volume method with a marching technique. (Abstract shortened by UMI.).
Book Synopsis Numerical Solution of a Two-phase Model for Laminar Film Condensation of Vapour-gas Mixtures in Channels by :
Download or read book Numerical Solution of a Two-phase Model for Laminar Film Condensation of Vapour-gas Mixtures in Channels written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory of Laminar Film Condensation by : Tetsu Fujii
Download or read book Theory of Laminar Film Condensation written by Tetsu Fujii and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the petroleum crisis in the 1970s, a lot of effort to save energy was made in industry, and remarkable achievements have been made. In the research and development concerning thermal energy, however, it was clar ified that one of the most important problems was manufacturing con densing systems with smaller size and higher performance. To solve this problem we need a method which synthesizes selections_ of the type of con denser, cooling tube and its arrangement, assessment of fouling on the cooling surfaces, consideration of transient characteristics of a condenser, etc. The majority of effort, however, has been to devise a surface element which enhances the heat transfer coefficient in condensation of a single or multicomponent vapor. Condensation phenomena are complexly affected by a lot of physical property values, and accordingly the results of theo retical research are expressed with several dimensionless parameters. On the other hand, the experimental research is limited to those with some specified cooling surfaces and some specified working fluids. Hence, the basic research of condensation is necessary for criticizing the enhancement effect as well as for an academic interest.
Book Synopsis Vapor Liquid Two Phase Flow and Phase Change by : Sarit Kumar Das
Download or read book Vapor Liquid Two Phase Flow and Phase Change written by Sarit Kumar Das and published by Springer Nature. This book was released on 2023-01-28 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive textbook highlights features of two phase flows and introduces the readers to flow patterns and flow maps. It covers a wide range of fundamental and complex subjects focusing on phase change processes like boiling, condensation or cavitation, and boiling phenomenon starting from pool boiling curves to heat transfer under nucleate boiling, film, and flow boiling. It also discusses themes such as numerical techniques for solving boiling and condensation as well as equipment used in industry for evaporation, boiling, and condensation. It includes pedagogical aspects such as end-of-chapter problems and worked examples to augment learning and self-testing. This book is a valuable addition for students, researchers, and practicing engineers.
Book Synopsis Film Condensation with and Without Body Force in Boundary-layer Flow of Vapor Over a Flat Plate by : Paul M. Chung
Download or read book Film Condensation with and Without Body Force in Boundary-layer Flow of Vapor Over a Flat Plate written by Paul M. Chung and published by . This book was released on 1961 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Detailed Two-phase Modelling of Film Condensation on a Horizontal Tube by : Esam Saleh
Download or read book Detailed Two-phase Modelling of Film Condensation on a Horizontal Tube written by Esam Saleh and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A complete two-phase numerical model of film condensation from a mixture of a vapour and a non-condensing gas that is based on the two-dimensional elliptic governing equations with variable physical properties is presented. The model predicts the full viscous flow and heat and mass transfer for the mixture around the tube and in the entire liquid film from the top of the tube to the falling film below the tube. A finite volume method is used with a segregated solution approach and a dynamically moving computational grid that tracks the phase interface sharply. Fundamental balances of mass, energy, and force are enforced accurately at the phase interface. The model was developed in steps and validated against various experimental and theoretical works in the literature for different two-phase flows. The validation tests included stratified flow of liquid and gas in a horizontal channel, falling liquid film over a vertical wall, and condensation of steam from a steam-air mixture in a vertical channel. The model was used to simulate laminar film condensation from a downward flowing steam-air mixture over an isothermal horizontal tube. The validity of this new model is demonstrated by comparisons with previous theoretical and experimental studies. New results are presented on the effects of free-stream-to-tube temperature difference, upstream Reynolds number, free-stream gas mass fraction, and free-stream pressure on the condensate film development, the local and average heat transfer coefficients, and the total condensate mass flow rate. It was found that the temperature difference had the greatest effect on the condensation rate and film thickness. The presence of non-condensing gas in the vapour has a strong negative impact on the condensation process. For the pure steam case, moderate changes in the upstream Reynolds number showed slight increases in condensate mass flow rate with increased Reynolds number. For the mixture case, however, moderate increase in upstream Reynolds number increases significantly the condensate mass flow rate and film thickness. This trend becomes more noticeable as the free-steam gas mass fraction increases. Changing the free-stream pressure demonstrated that property variation had a relatively smaller effect than temperature difference and gas mass fraction changes.
Book Synopsis Modeling of Mixed-convection Laminar Film Condensation from Mixtures of a Vapor and a Lighter Noncondensable Gas by : Vlajko Srzić
Download or read book Modeling of Mixed-convection Laminar Film Condensation from Mixtures of a Vapor and a Lighter Noncondensable Gas written by Vlajko Srzić and published by . This book was released on 1997 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vertical Downflow Condensation Heat Transfer in Gas-steam Mixtures by : Daniel Grant Ogg
Download or read book Vertical Downflow Condensation Heat Transfer in Gas-steam Mixtures written by Daniel Grant Ogg and published by . This book was released on 1991 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling of Mixed-convection Laminar Film Condensation from Mixtures of a Vapor and a Lighter Noncondensable Gas by :
Download or read book Modeling of Mixed-convection Laminar Film Condensation from Mixtures of a Vapor and a Lighter Noncondensable Gas written by and published by . This book was released on 1907 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of a lighter noncondensable gas on laminar film condensation from moving vapor-gas mixtures was investigated. Condensation occurred on the top of an isothermal flat plate with an arbitrary inclination. The liquid film and the mixture boundary layers were described with the conservation equations for mass, momentum, energy, and gas species (for the mixture boundary layer only). A finite volume method was applied on a staggered grid in the numerical solution domain. The properties for both liquid and mixture were evaluated at the local temperature. The solution procedure was terminated either when the separation criteria were met or when the flow reached the transition to turbulence. The main objectives of the study were to investigate the mixture boundary layer separation distance and the reduction in heat transfer to the wall due to the presence of a lighter noncondensable gas. Three vapor-gas combinations were studied: steam-hydrogen, Freon12-air, and mercury-air. Applying two simple collapsing procedures, a set of graphs is presented for each vapor-gas combination which can be used to estimate the separation length for a given set of input parameters. For each mixture and for a given free stream temperature, the variation of Nusselt number (normalized by the square root of the local Reynolds number) along the plate is also presented for different values of gas concentration and wall temperature. (Abstract shortened by UMI.).
Book Synopsis Buoyancy-Thermocapillary Convection of Volatile Fluids in Confined and Sealed Geometries by : Tongran Qin
Download or read book Buoyancy-Thermocapillary Convection of Volatile Fluids in Confined and Sealed Geometries written by Tongran Qin and published by Springer. This book was released on 2017-07-25 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis represents the first systematic description of the two-phase flow problem. Two-phase flows of volatile fluids in confined geometries driven by an applied temperature gradient play an important role in a range of applications, including thermal management, such as heat pipes, thermosyphons, capillary pumped loops and other evaporative cooling devices. Previously, this problem has been addressed using a piecemeal approach that relied heavily on correlations and unproven assumptions, and the science and technology behind heat pipes have barely evolved in recent decades. The model introduced in this thesis, however, presents a comprehensive physically based description of both the liquid and the gas phase. The model has been implemented numerically and successfully validated against the available experimental data, and the numerical results are used to determine the key physical processes that control the heat and mass flow and describe the flow stability. One of the key contributions of this thesis work is the description of the role of noncondensables, such as air, on transport. In particular, it is shown that many of the assumptions used by current engineering models of evaporative cooling devices are based on experiments conducted at atmospheric pressures, and these assumptions break down partially or completely when most of the noncondensables are removed, requiring a new modeling approach presented in the thesis. Moreover, Numerical solutions are used to motivate and justify a simplified analytical description of transport in both the liquid and the gas layer, which can be used to describe flow stability and determine the critical Marangoni number and wavelength describing the onset of the convective pattern. As a result, the results presented in the thesis should be of interest both to engineers working in heat transfer and researchers interested in fluid dynamics and pattern formation.
Book Synopsis Computational Study of Liquid Film Condensation with the Presence of Non-Condensable Gas in a Vertical Tube by : Adil Charef
Download or read book Computational Study of Liquid Film Condensation with the Presence of Non-Condensable Gas in a Vertical Tube written by Adil Charef and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this chapter is to study the liquid film condensation in a thermal desalination process, which is based on the phase change phenomenon. The external tube wall is subjected to a constant temperature. The set of the non-linear and coupled equations expressing the conservation of mass, momentum and energy in the liquid and gas mixtures is solved numerically. An implicit finite difference method is employed to solve the coupled governing equations for liquid film and gas flow together with the interfacial matching conditions. Results include radial direction profiles of axial velocity, temperature and vapour mass fraction, as well as axial variation of the liquid film thickness. Additionally, the effects of varying the inlet conditions on the phase change phenomena are examined. It was found that increasing the inlet-to-wall temperature difference improves the condensate film thickness. Decreasing the radius of the tube increased the condensation process. Additionally, non-condensable gas is a decisive factor in reducing the efficiency of the heat and mass exchanges. Overall, these parameters are relevant factors to improve the effectiveness of the thermal desalination units.
Book Synopsis Investigation of heat transfer from condensing steam-gas mixtures and turbulent films downward inside a vertical tube : a dissertation by : Shine-Zen Kuhn
Download or read book Investigation of heat transfer from condensing steam-gas mixtures and turbulent films downward inside a vertical tube : a dissertation written by Shine-Zen Kuhn and published by . This book was released on 1975 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
