Relevant bibliographies by topics / Thermodynamic homogeneity

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Thermodynamic homogeneity'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Thermodynamic homogeneity"

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Guseinov, G. M., D. M. Babanly, F. M. Sadygov, and M. B. Babanly. "Thermodynamic properties and homogeneity regions of Tl6SCl4 and Tl5Se2Cl." Inorganic Materials 45, no. 2 (February 2009): 129–34. http://dx.doi.org/10.1134/s0020168509020046.

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Wang, Jian Li, Bi Yang Tuo, Xun Pu Hu, and Zhu Lin Liu. "Thermodynamic Properties and Thermodynamic Assessment of Ta-Sn System." Advanced Materials Research 821-822 (September 2013): 849–53. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.849.

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For the little thermodynamic information of Ta-Sn system, the liquid mixing enthalpy of Ta-Sn system, and the formation enthalpy of Ta2Sn3 and Ta3Sn were calculated by Miedema model. The Ta-Sn phase diagram was modeled using CALPHAD technology to obtain a reliable thermodynamic description of the system. Two intermetallic compounds Ta2Sn and Ta3Sn were treated as stoichiometric compounds for the very narrow homogeneity ranges. The higher temperature phase diagram of Ta-Sn system was constructed according to Nb-Sn system for the empty information. The optimization process was carried out using the PARRAT software including in Thermo-Calc database system. The thermodynamic calculated Ta-Sn phase diagram is agreement with the evaluated phase diagram, and the calculated mixing enthalpies of molten Ta-Sn system match well with the Miedema data. The formation enthalpies of the two intermetallic compounds Ta2Sn and Ta3Sn are compared with the Miedema values.
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Kale, G. B. "Thermodynamic Diffusion Coefficients." Defect and Diffusion Forum 279 (August 2008): 39–52. http://dx.doi.org/10.4028/www.scientific.net/ddf.279.39.

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A new form of diffusion coefficient termed as thermodynamic diffusion coefficient is introduced in this paper. Conventionally, diffusion coefficients are evaluated using concentration gradient as driving force. But truly, chemical potential gradient is the actual driving force that determines the material flow in any part of the system. Thermodynamic diffusion coefficients are based on chemical potential gradient as driving force. The relation between thermodynamic diffusion coefficients and phenomenological coefficients has been established. The advantages of thermodynamic diffusion coefficients have been underlined, especially, in the cases of line compounds where concentration difference across the phase is zero or in case of intermetallic compounds with narrow homogeneity range. The intrinsic thermodynamic diffusion coefficients are equal to tracer diffusion coefficients. This helps in estimating tracer diffusivities in cases where tracers are not easily available. The advantages of thermodynamic diffusion coefficients are shown in binary and ternary systems by illustrating them in Ni-Al and Fe-Ni-Cr systems.
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IDER, Muhsin. "Thermodynamic stability and homogeneity of cuprous selenide by emf and coulometric titration." Solid State Ionics 329 (January 2019): 140–48. http://dx.doi.org/10.1016/j.ssi.2018.11.018.

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Janiš, Václav, and Lenka Zdeborová. "Replica Trick with Real Replicas: A Way to Build in Thermodynamic Homogeneity." Progress of Theoretical Physics Supplement 157 (2005): 99–102. http://dx.doi.org/10.1143/ptps.157.99.

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Tsvetkov, Dmitry S., Ivan L. Ivanov, Dmitry A. Malyshkin, Anton L. Sednev, Vladimir V. Sereda, and Andrey Yu Zuev. "Double perovskites REBaCo2−xMxO6−δ (RE=La, Pr, Nd, Eu, Gd, Y; M=Fe, Mn) as energy-related materials: an overview." Pure and Applied Chemistry 91, no. 6 (June 26, 2019): 923–40. http://dx.doi.org/10.1515/pac-2018-1103.

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Abstract This work, based on the experimental and theoretical research carried out by the authors during the last decade, presents an overview of formation, stability and defect thermodynamics, crystal structure, oxygen nonstoichiometry, chemical strain and transport properties of the double perovskites REBaCo2−xMxO6−δ (RE = La, Pr, Nd, Eu, Gd, Y; M = Fe, Mn). These mixed-conducting oxides are widely regarded as promising materials for various energy conversion and storage devices. Attention is focused on (i) thermodynamics of formation and disordering, oxygen nonstoichiometry, crystal and defect structure of the double perovskites REBaCo2−xMxO6−δ, as well as their thermodynamic stability and the homogeneity ranges of solid solutions, (ii) their overall conductivity and Seebeck coefficient as functions of temperature and oxygen partial pressure and (iii) the anisotropic chemical strain of their crystal lattice. The relationships between the peculiarities of the defect structure and related properties of the double perovskites are analysed.
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Idbenali, Mohamed, Colette Servant, and M’barek Feddaoui. "Thermodynamic assessment of Hafnium Iridium binary system." Metallurgical Research & Technology 115, no. 5 (2018): 503. http://dx.doi.org/10.1051/metal/2018001.

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The Hf–Ir system has been thermodynamically modeled by the CALPHAD approach. Hf2Ir, αHfIr, βHfIr, γHfIr (high temperature phase) and HfIr3 which have a homogeneity range, were treated as the formula (Hf,Ir)x:(Ir,Hf)1−x by a two-sublattice model with a mutual substitution of Hf and Ir in both sublattices.Hf5Ir3 has been treated as a stoichiometric compound while a solution model has been used for the description of the FCC (Ir) solid solution. Additionally, two different models describing the excess Gibbs energy for the liquid and for the solid solutions (BCC, FCC and HCP) were used and their predictions are compared. The calculations based on the thermodynamic modeling are in good agreement with the phase diagram data and experimental thermodynamic values available in the literature.
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Andryushin, Konstantin, Inna Andryshina, Lidiya Shilkina, Svetlana Dudkina, Iliya Verbenko, Larisa Reznichenko, Mihail Mazuritskiy, et al. "Thermodynamic Prehistory in the Formation of the Internal Structure of Highly Stable Ferroelectric Materials." Applied Sciences 8, no. 10 (October 12, 2018): 1897. http://dx.doi.org/10.3390/app8101897.

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We investigated and presented our results for the dependence of the characteristics of the crystalline and grain structures of the PCR-13 material (based on the lead zirconate titanate (PZT) system), which was sintered in various ways, on the regulations for its preparation. The data from the microfluorescence analysis of the surface of ceramic materials were provided, which allowed us to state that micro X-ray fluorescence spectrometry (MICRO–XRF), supplemented by mathematical statistics, allows us to trace even small changes in the chemical composition of ceramic samples, reliably characterize the degree of surface homogeneity and provide strict mathematical conclusions related to the reproducibility of the properties of manufactured piezoelectric ceramic materials. Based on the obtained data, the optimal conditions for ceramics have been selected, which ensure homogeneity, high-density structure and reproducibility of the characteristics. This allows us to reliably use the material in frequency-selective equipment.
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Bondarenko, Yu O., N. F. Voronina, and O. A. Shmatko. "Kinetic and Thermodynamic Precipitation Parameters of the Pb-Sn Solid Solutions." Defect and Diffusion Forum 277 (April 2008): 193–98. http://dx.doi.org/10.4028/www.scientific.net/ddf.277.193.

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Stages of cellular precipitation for the supersaturated Pb-Sn solid solutions were analyzed. This was done for almost the whole homogeneity interval. Literary heritage as well as the data of the present authors concerning kinetic and thermodynamic parameters of cellular precipitation for these solid solutions were compared and summarized. It was shown that the segregation factor, which characterizes the impurity atoms behavior at the grain boundary, decreases with solid solution supersaturation increase.
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Hu, Z., C. Huang, J. Tu, Y. Huang, and A. Dong. "Thermodynamic modeling of the In-Sc and In-Y systems supported by first-principles calculations." Journal of Mining and Metallurgy, Section B: Metallurgy 54, no. 2 (2018): 161–67. http://dx.doi.org/10.2298/jmmb171121004h.

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Based on an assessment of the phase equilibria and thermodynamic data in the literature, the thermodynamic modeling of the In?Sc and In?Y systems was carried out by means of the calculation of phase diagram (CALPHAD) method supported by first-principles calculations. The solution phases, i.e., liquid, (In), (?Sc), (?Sc), (?Y) and (?Y), were modeled with the substitutional regular solution model. Ten intermetallic compounds, including InSc3, InSc2, In4Sc5, InSc, In2Sc, In3Sc, InY2, InY, In5Y3, and In3Y were described as stoichiometric phases, while In3Y5 was modeled with a sublattice model with respect to its homogeneity range. The enthalpies of formation of the intermetallic compounds at 0 K were computed using firstprinciple calculations and were used as input for the thermodynamic optimization. A set of self-consistent thermodynamic parameters for both the In?Sc and In?Y systems were obtained and the calculated phase diagrams are in good agreement with the experimental data.
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Dissertations / Theses on the topic "Thermodynamic homogeneity"

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Klíč, Antonín. "Hierarchická řešení a struktura parametrů uspořádání v teroii středního pole pro spinová skla a příbuzné materiály." Doctoral thesis, 2013. http://www.nusl.cz/ntk/nusl-327199.

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We analyze the replica-symmetry-breaking (RSB) construction in the Sherrington - Kirkpatrick (SK) model and in the p-state Potts glass for p ≤ 4. We present a general scheme for deriving an asymptotic solution with an arbitrary number of discrete hierarchies of broken replica symmetry near the critical temperature for both models, and close to the de Almeida- Thouless instability line in the SK model. We show that in the SK model all solutions with finite many hierarchies are unstable and only the scheme with infinite many hierarchies becomes marginally stable in the spin-glass phase. For the Potts glass, we find, moreover, an one-step RSB solution which co- exists with the infinite RSB solution for p > p∗ ≈ 2.82. The former solution is locally stable but has lower free energy than the latter which is marginally stable and has the highest free energy. 1
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Books on the topic "Thermodynamic homogeneity"

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Rau, Jochen. Thermodynamic Limit. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780199595068.003.0005.

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When one describes systems which are homogeneous, stable, and macroscopic in size, it no longer matters whether macroscopic data are given as sharp constraints or as expectation values. This is the thermodynamic limit. The behaviour of matter in this limit is governed by four laws, pertaining respectively to the properties of equilibrium (zeroth law), energy (first law), entropy (second law), and the ground state (third law). This chapter provides the mathematical criteria for homogeneity and stability and explores their respective consequences. In particular, it discusses the distinction between extensive and intensive variables, as well as the Gibbs–Duhem relation. It introduces the three thermodynamic ensembles—microcanonical, canonical, and grand canonical—and shows their equivalence in the thermodynamic limit. Finally, this chapter shows how, in the thermodynamic limit, the four laws of thermodynamics arise naturally within the statistical framework.
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Book chapters on the topic "Thermodynamic homogeneity"

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Predel, F. "Phase homogeneity of Ni-Zn (nickel-zinc) system." In Phase Equilibria, Crystallographic and Thermodynamic Data of Binary Alloys, 132. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-24977-8_76.

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Paul, Aloke, Tomi Laurila, Vesa Vuorinen, and Sergiy V. Divinski. "Growth of Phases with Narrow Homogeneity Range and Line Compounds by Interdiffusion." In Thermodynamics, Diffusion and the Kirkendall Effect in Solids, 299–336. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07461-0_7.

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Porter, Theodore M. "Time’s Arrow and Statistical Uncertainty in Physics and Philosophy." In The Rise of Statistical Thinking, 1820-1900, 204–41. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691208428.003.0008.

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This chapter explores how German economists and statisticians of the historical school viewed the idea of social or statistical law as the product of confusion between spirit and matter or, equivalently, between history and nature. That the laws of Newtonian mechanics are fully time-symmetric and hence can be equally run backwards or forwards could not easily be reconciled with the commonplace observation that heat always flows from warmer to cooler bodies. James Clerk Maxwell, responding to the apparent threat to the doctrine of free will posed by thermodynamics and statistics, pointed out that the second law of thermodynamics was only probable, and that heat could be made to flow from a cold body to a warm one by a being sufficiently quick and perceptive. Ludwig Boltzmann resisted this incursion of probabilism into physics but in the end he was obliged, largely as a result of difficulties presented by the issue of mechanical reversibility, to admit at least the theoretical possibility of chance effects in thermodynamics. Meanwhile, the American philosopher and physicist C. S. Pierce determined that progress—the production of heterogeneity and homogeneity—could never flow from rigid mechanical laws, but demanded the existence of objective chance throughout the universe.
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Conference papers on the topic "Thermodynamic homogeneity"

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Kinkhabwala, Brijesh, Sandeep S, Ashok Raaj, Krishnan Sadagopan, and Sunil Pandey. "Feasibility of Employing Negative Valve Overlap for Enhanced Charge Homogeneity in PCCI Diesel Engine Using 1D Thermodynamic Simulation and 3D CFD Study." In Symposium on International Automotive Technology 2019. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-26-0135.

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Fischer, Stefan, David Kluß, and Franz Joos. "On the Influence of Fuel Mixing and Flue Gas Recirculation on the Emissions of a Fuel Flexible Gas Turbine Combustor." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42373.

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The main benefits of operating a combustor under flue gas recirculation conditions are the increase in efficiency of the post combustion carbon capture and storage process and the potential to reduce NOX emissions while keeping the thermal load of the gas turbine constant. The latter is primarily caused by the change in thermodynamic properties of the combustive mixture with increasing vitiation. As a result, the dominant NOX formation pathways change with increasing FGR ratio. In a partially premixed combustor, the formation of NOX emissions can also be influenced by the fuel mixing behavior. Different setups lead to combustive mixtures with different degrees of homogeneity as well as influencing the distribution of the mixture within the combustion chamber. In this paper the combined effects of the variation of mixture homogeneity and the flue gas recirculation ratio on the NOX emissions and the stability range is experimentally investigated for different fuel gases. The experiments are performed on the atmospheric laboratory test rig, which is equipped with a partially premixed combustor. The burner is equipped with modular fuel gas nozzles allowing for the variation of the fuel mixing behavior. Exhaust gas measurements are performed to evaluate the influence of the parameters on the emissions profile of the combustor and to compare the results to a theoretical study. The results of this study show that the level of nitric oxide emissions as well as the potential to decrease said emissions with FGR operation is dependent on the mixing behavior of the combustor. Furthermore, the combined effects of fuel gas nozzle and FGR operation lead to a proposal of an operational strategy for the combustor which combines the advantages of low nitric oxide emissions and a broad range of stability.
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Bajwa, Abdullah U., Mark Patterson, Taylor Linker, and Timothy J. Jacobs. "A New Single-Zone Multi-Stage Scavenging Model for Real-Time Emissions Control in Two-Stroke Engines." In ASME 2019 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/icef2019-7198.

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Abstract Gas exchange processes in two-stroke internal combustion engines, i.e. scavenging, remove exhaust gases from the combustion chamber and prepare the fuel-oxidizer mixture that undergoes combustion. A non-negligible fraction of the mixture trapped in the cylinder at the conclusion of scavenging is composed of residual gases from the previous cycle. This can cause significant changes to the combustion characteristics of the mixture by changing its composition and temperature, i.e. its thermodynamic state. Thus, it is vital to have accurate knowledge of the thermodynamic state of the post-scavenging mixture to be able to reliably predict and control engine performance, efficiency and emissions. Several simple-scavenging models can be found in the literature that — based on a variety of idealized interaction modes between incoming and cylinder gases — calculate the state of the trapped mixture. In this study, boundary conditions extracted from a validated 1-D predictive model of a single-cylinder two-stroke engine are used to gauge the performance of four simple scavenging models. It is discovered that the assumption of thermal homogeneity of the incoming and exiting gases is a major source of inaccuracy. A new non-isothermal multi-stage single-zone scavenging model is thus, proposed to address some of the shortcomings of the four models. The proposed model assumes that gas-exchange in cross-scavenged two-stroke engines takes place in three stages; an isentropic blowdown stage, followed by perfect-displacement and perfect-mixing stages. Significant improvements in the trapped mixture state estimates were observed as a result.
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Bauer, Stefan, Simon Bäßler, Balbina Hampel, Christoph Hirsch, and Thomas Sattelmayer. "Mixture Quality of a Vortex Generator Premixer and Alternative Premixer Designs in the Auto-Ignition Regime of Hydrogen Air Flames." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64154.

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The application of vortex generator premixers (VGPs) is particularly challenging for highly reactive fuels in recuperated gas turbines, because high combustor inlet temperature leads to a potential risk of premature self-ignition and flame flashback. As current knowledge does not extend to the temperature range far above the self-ignition temperature, an experimental investigation of the operational limits of VGPs is conducted at the Thermodynamics Institute of the Technical University of Munich. The study is particularly focused on highly reactive fuels and the thermodynamic conditions present in recuperated gas turbines with pressure ratios of 4–5. The present study is focuses on fuel-air mixing at the corresponding high air temperatures. A fuel-air mixing device is required to achieve sufficient mixing quality without excessive premixer length. Vortex generators are known to be effective in augmenting the distribution of fuel injected from the tube wall over the cross section of the tube. In the range of typical gas turbine combustor inlet temperatures, the performance of VGPs has already been investigated for methane as well as for hydrogen-methane blends. The limits of operating a VGP under auto-ignition relevant conditions were presented in a previous study. In this study, the VGP’s mixture quality under these conditions is experimentally investigated. For this purpose, the existing test rig has been modified to conduct high speed PIV and MixPIV measurements. Measurements at different positions inside and downstream of the injector have been performed. Two other mixer types in addition to the VGP are investigated to determine the influence of mixture quality on auto-ignition behavior in a future study and to validate MixPIV measurements. The influence of the momentum flux ratio on mixture quality is presented for the three mixer types. Comparison shows that the VGP exhibits significantly better mixture homogeneity at the mixer exit than do the two other mixer types.
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Kim, Doohyun, Angela Violi, and André Boehman. "The Effects of Injection Timing and Injected Fuel Mass on Local Charge Conditions and Emissions for Gasoline Direct Injection Engines." In ASME 2017 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icef2017-3623.

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Increased Particulate Matter (PM) emissions from Gasoline Direct Injection (GDI) engines compared to conventional Port Fuel Injection (PFI) engines have been raising concerns because of the PM’s detrimental health effects and the stringent emissions regulations. One of the widely accepted hypotheses is that local rich pockets inside the combustion chamber are the primary reason for the increased PM emissions. In this paper, we investigate the effects of injection strategies on the charge composition and local thermodynamic conditions of a light duty GDI engine, and determine their impact on PM emissions. The operation of a 1.6L GDI engine is simulated using a 3-D Computational Fluid Dynamics (CFD) code. Combustion characteristics of a 3-component gasoline surrogate (n-heptane/iso-octane/toluene) are analyzed and the effects of injection timing (300° vs 240° vs 180° BTDC) and injected fuel mass (globally stoichiometric vs fuel rich) are explored at 2000 rpm, 9.5 bar BMEP condition, focusing on the homogeneity of the charge and the formation of the gaseous species that are soot precursors. The results indicate that when the physical time for air/fuel mixing is not long enough, fuel-rich pockets are present until combustion occurs, where high concentrations of soot precursors are found, such as acetylene and pyrene. In addition, simulation results indicate that the location of wetted surface as well as the in-cylinder flow structure induced by the fuel jet hitting the piston bowl is significantly influenced by varying the injection timing, which affects subsequent air/fuel mixing. When the injected fuel mass is increased, the equivalence ratio distribution inside the combustion chamber shifts toward fuel-rich side, generating more mixtures with Φ > 1.5, where formation of acetylene and pyrene are favored.
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Dannhauer, Axel. "Investigation of Trailing Edge Cooling Concepts in a High Pressure Turbine Cascade: Analysis of the Adiabatic Film Cooling Effectiveness." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59343.

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Within a European research project experimental studies were performed concerning the determination of the film cooling efficiency on the pressure side of trailing edges of high pressure turbine blades. The experiments were carried out at the linear cascade wind tunnel (EGG) of the German Aerospace Center (DLR), Go¨ttingen. The thermodynamic investigations were performed using the same cascade geometries and trailing edge configurations as for the aerodynamic measurements. Two different trailing edge geometries with coolant ejection were investigated. The first configuration was equipped with a pressure side cutback while for the second configuration the pressure side film cooling was realized by a row of cylindrical holes. The determination of the surface temperatures was done by using a combination of IR-thermography and thermocouples. Preliminary studies showed the feasibility to use metallic surfaces of the suction side of the adjacent blade as a mirror for IR-thermography. Thus it is possible to observe the pressure side near the trailing edge of interest by means of an infrared camera. The camera was mounted outside of the cascade’s free stream ensuring no influence to the aerodynamic boundary conditions. Up to seven flush mounted thermocouples on each side of the trailing edge were used for an in-situ calibration of the infrared pictures and thermal loss calculations. The distributions and averaged values of the film cooling efficiency are in agreement with aerodynamic measurements [9]. The results for the cutback configuration with 0.5% mass flow rate ejected show an accumulation of coolant just behind the coolant slot which is caused by a vortex in the dead region of the cutback. In case of 1.0% mass flow rate a refilling of this region with coolant is indicated. For higher mass flow rates the distributions of the film cooling efficiency looses it’s homogeneity due to flow separations on some ribs of the pin fin array inside of the slot. For the configuration with pressure side bleeding the best coverage could be obtained applying 1.0% mass flow rate.
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Gorbunov, Dmitriy, Marina Gorbunova, Idosif Bulatov, and Sergey Gorbunov. "HOMOGENEITY OF PARAMETERS OF THE HUMAN NEUROMUSCULAR SYSTEM UNDER STATIC LOAD IN THE FRAMEWORK OF THE THERMODYNAMICS OF NON-EQUILIBRIUM SYSTEMS BY I.R. PRIGOGINE." In XV International interdisciplinary congress "Neuroscience for Medicine and Psychology". LLC MAKS Press, 2019. http://dx.doi.org/10.29003/m365.sudak.ns2019-15/144.

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Kastner, Johannes, Sara Fedier, Norbert Kockmann, and Peter Woias. "Reactive Precipitation in Microchannels: Impact of Convective Mixing on Particle Formation." In ASME 2007 5th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2007. http://dx.doi.org/10.1115/icnmm2007-30035.

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Reactive precipitation in micro- and minichannels currently draws attention of both, chemists and engineers in the field of micro process engineering. Due to intensified mixing and improved heat and mass transfer, fast chemical and thermodynamical processes involved in precipitation can be controlled readily in micro or mini structures. Particularly microchannels are a promising technology for particulate processes allowing continuous operation along with little or no backmixing. However, the sensitivity of microscale channels to blocking and fouling requires careful design and appropriate peripheral equipment. This study presents experimental results of barium sulfate precipitation from barium chloride solution and sulfuric acid in both, T-shaped and injection micromixers. The measured particle size distributions (PSD) are characterized by their first and second moment, reflecting the correlation between fluidic mixing and precipitation: faster mixing results in smaller mean particle sizes (1st moment of the PSD). The homogeneity of the mixing process on the other hand should have impact onto the width of the distribution (2nd moment of the PSD) due to superposition of locally formed particles to the global size distribution. The experimental particle size distributions are compared with simulations based on reduced-order modeling of the diffusive mixing process, coupled with the population balance for particle nucleation and growth. While the simulated size distributions have mean diameters between 40 nm and 68 nm, experimental data are between 90 nm and 130 nm.
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