krainaksiazek heat and mass transfer during condensation 20124099

- znaleziono 5 produktów w 2 sklepach

Modeling Heat Mass Transfer during Deep-Fat Frying - 2849170443

259,28 zł

Modeling Heat Mass Transfer during Deep-Fat Frying



Condensation of HFC-134a and HFC-404A in a smooth and micro-fin tube - 2843902205

526,73 zł

Condensation of HFC-134a and HFC-404A in a smooth and micro-fin tube LAP Lambert Academic Publishing

Książki / Literatura obcojęzyczna

The purpose of this work was to study the condensation heat transfer and pressure drop characteristics ofHFC-134a in a micro-fined tube with an 18 degree helix angle and to compare them to those in a smooth tube for various operating conditions.The experimental test facility is designed, developed and is used to determine the condensation HTC and pressure drop in smooth and micro-fin tubes for various HFC refrigerants namely HFC-134a, R-404A, R-407C, R-507A. The experimentation covers wide range of operating parameters such as mass flux and condensing temperatures. The instrumentations used for measurements are calibrated from recognized calibration centres. The hermetically sealed compressor is used for circulating refrigerant; effect of oil present in the refrigerant during condensation is also taken into account. The condensation of HFC-134a and R-404A in smooth and micro-fin tubes are measured and obtained the values of condensation HTCs and pressure drops for different mass flux and condensing temperatures


Convective Heat and Mass Transfer - 2854300743

397,51 zł

Convective Heat and Mass Transfer Cambridge University Press

Książki / Literatura obcojęzyczna

This book was developed during Professor Ghiaasiaan's ten years of teaching a graduate-level course on convection heat and mass transfer and is further enhanced by his twenty years of teaching experience. Ideal for a graduate course dealing with the theory and practice of convection heat and mass transfer, it treats well-established theory and practice, but is also enriched by its coverage of modern areas such as flow in microchannels and computational fluid dynamics-based design and analysis methods. Convection heat transfer is the main focus, and essentials of mass transfer are also covered. The mass transfer material and problems are presented such that they can be easily skipped. The book is richly enhanced by examples and end-of-chapter exercises with solutions available for qualified instructors. It includes 18 appendices providing compilations of most essential property and mathematical information for analysis of convective heat and mass transfer processes.


Bubble Systems - 2854447178

778,62 zł

Bubble Systems Springer, Berlin

Książki / Literatura obcojęzyczna

This monograph presents a systematic analysis of§bubble system mathematics, using the mechanics of two-phase systems in§non-equilibrium as the scope of analysis. The author introduces the§thermodynamic foundations of bubble systems, ranging from the fundamental§starting points to current research challenges. This book addresses a range of§topics, including description methods of multi-phase systems, boundary and§initial conditions as well as coupling requirements at the phase boundary.§Moreover, it presents a detailed study of the basic problems of bubble dynamics§in a liquid mass: growth (dynamically and thermally controlled), collapse,§bubble pulsations, bubble rise and breakup. Special emphasis is placed on§bubble dynamics in turbulent flows. The analysis results are used to write§integral equations governing the rate of vapor generation (condensation) in§non-equilibrium flows, thus creating a basis for solving a number of practical§problems. This book is the first to present a comprehensive theory of boiling§shock with applications to problems of critical discharge and flashing under§the fast decompression conditions. Reynolds' analogy was§the key to solving a number of problems in subcooled forced-flow boiling, the§theoretical results of which led to easy-to-use design formulas. This book is§primarily aimed at graduate and post-graduate students specializing in hydrodynamics§or heat and mass transfer, as well as research experts focused on two-phase§flow. It will also serve as a comprehensive reference book for designers§working in the field of power and aerospace technology.§


Discrete particle modeling of a fluidized bed granulator - 2844166267

305,51 zł

Discrete particle modeling of a fluidized bed granulator Cuvillier Verlag

Książki / Literatura obcojęzyczna

Size-enlargement and structuration processes in fluidized beds such as granulation and agglomeration play an important role in the pharmaceutical and fine chemical industries as well as in food technology to improve the flowability and the instant properties of solid products. Dustfree and free-flowing particles can be produced in a process with favourable heat- and mass transfer conditions. Furthermore, this technology allows the formulation of particles with novel functionalities by applying coating layers or via the encapsulation of active ingredients. Several interdependent micro mechanisms including particle collisions, wetting, drying and phase transitions govern the process dynamics and complicate predictions on the effect of variable operating conditions on product properties such as structure, strength and re-dissolution behaviour. Profound knowledge on these mechanisms is needed to understand the influence of individual process parameters on the final product properties.A suitable approach to model the particle interactions in fluidized beds is the Discrete Element Method (DEM) coupled with Computational Fluid Dynamics (CFD). Information on gas and particle velocities, particle rotation and collision dynamics, which are very complicated to measure in fluidized beds, can be studied in detail with this technique.This thesis presents DEM-CFD simulation results for three different granulator configurations (top-spray, Wurster-coater, spouted bed) in comparison to experimental results, regarding the agglomeration of amorphous maltodextrin (DE 21). In simulation and experiment the identical geometry of the equipment was used. Mechanical material properties, such as the coefficient of restitution and the Young's modulus, which are required for the DEM model and which are frequently used as fitting parameters, were measured via static and dynamic deformation tests using maltodextrin agglomerates, beads and bars. The strength of the experimentally produced agglomerates was characterized with a compression tester. Their flow behaviour was assessed with the help of a shear cell.Very promising results were obtained showing that the homogeneity of particle wetting can well be approximated with the residence time distribution of the particles inside the spray zone.Homogeneous wetting allows achieving a narrow product size distribution (Fries et al., 2011a).Furthermore, the growth rate of the agglomerates can well be correlated with the simulated wetting intensity, the collision frequency and the collision velocity distribution inside the spray zone. The agglomerate strength shows a strong correlation with the particle-wall collision frequency and velocity distribution found in the simulations. Good agreement was found between the simulation results for the maximum particle deformation and for the energy dissipation during collisions and the measured deformation at the breakage point and the breakage energy.Due to the high numerical effort, DEM is only suitable for small scale applications. However, the obtained information on the kinetics of particle-particle interactions can be applied as input for macroscopic process models in the framework of a multi scale modeling scheme (Fries et al., 2011b; Werther et al., 2011).It can be concluded that DEM is a powerful tool for the detailed characterization of fluidized bed granulators. Highly relevant practical answers can be obtained from the model such as the choice of the optimal equipment geometry depending on material properties and product requirements. The model can point out where to position the spray nozzles in order to achieve homogeneous particle wetting and if a draft tube is helpful to maintain stable particle circulation. Based on such findings the model shows potential to increase the throughput of a fluidized bed granulator, while avoiding a bed collapse.


Sklepy zlokalizowane w miastach: Warszawa, Kraków, Łódź, Wrocław, Poznań, Gdańsk, Szczecin, Bydgoszcz, Lublin, Katowice

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