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    Wyświetlanie 1-14 z 14
    Tytuł:
    Improper Interpretation of Dilatometric Data for Cooling Transformation in Steels
    Nieprawidłowa interpretacja dylatogramów dla przemian podczas chłodzenia stali
    Autorzy:
    Pawłowski, B.
    Bała, P.
    Dziurka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/354930.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dilatogramy
    derivative
    phase transformations during cooling
    software
    dylatogram
    pochodna
    przemiany fazowe podczas chłodzenia
    oprogramowanie
    Opis:
    Dilatometry is the most commonly method of producing CCT diagrams and analyzing phase transformations during cooling (as well as transformations during heating) and it permits the real-time monitoring of the extent of reaction in terms of dimensional changes due to phase transformation. All modern dilatometers are fitted with computerised systems which collect dimensional change signals versus temperature to plot a dilatometric curve and also to calculate and plot the derivative of the relative dimensional change with respect to temperature. Unfortunately, elaborated by dilatometers manufacturers software, in many cases could lead to wrong interpretation of phase transformations during cooling.
    Dylatometria jest najczęściej stosowana technika badawczą przy tworzeniu wykresów CTPc i analizie przemian fazowych podczas chłodzenia oraz nagrzewania. Umożliwia również śledzenie na bieżąco postępu przemiany dzięki rejestracji zmian wymiarów próbki w trakcie przemiany. Wszystkie współczesne dylatometry są wyposażone w systemy komputerowe sterowania i akwizycji danych pomiarowych umożliwiające obserwację dylatogramu w trakcie chłodzenia czy nagrzewania jak również obliczenie i narysowanie po zakończeniu eksperymentu wykresu różniczki (pierwszej pochodnej) w funkcji temperatury. Niestety, fabryczne oprogramowanie w wielu przypadkach może prowadzić do błędnej interpretacji zjawisk podczas przemian fazowych w trakcie chłodzenia.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 3; 1159-1161
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magmatic signature of the closure of the northern branch of Neo-Tethys : Upper Paleocene-Middle Eocene magmatism at the boundary of Tavşanlı-Sakarya Zone (Turkey)
    Autorzy:
    Güllü, Bahattin
    Kadiıoğlu, Yusuf Kağan
    Powiązania:
    https://bibliotekanauki.pl/articles/2135033.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    cooling age
    sub-volcanic phase
    shoshonites
    enclave
    petrological modelling
    Opis:
    Numerous plutons composed of granite, granodiorite, diorite-porphyry, monzonite, granodiorite-porphyry and diorite/microdiorite-porphyry occur at the boundary of the TavêanlÏ-Sakarya Zone, in the eastern part of the northwestern Anatolian magmatic belt, Turkey. These rocks belong to two different types: a medium-K calc-alkaline granodiorite series (with associated dykes and sub-volcanic rocks) and a shoshonitic series of granites. The rocks of the shoshonitic series have SiO2from 67.5 to 75.6 wt.% with Mg# from 35.1 to 59.5, whereas the medium-K calc-alkaline series rocks have SiO2 between 54.6 and 67.7 wt.% with Mg# from 43.5 to 60.8. There is a clear enrichment of LILE with respect to the HFSE in all magmatic units of the region. These magmatic rocks reflect properties of collision-related arc magmatism in the various geochemical discrimination diagrams. The initial Sr/86Sr and 143Nd/144Nd istopic ratios of the magmatic units range from 0.705506 to 0.710902 and 0.512178 to 0.512594, respectively. Collision-related granitoids yielded a 40Ar/39Ar cooling age age of 59.13 ±1.87 Ma, and arc-related granitoids and associated sub-volcanic units 44.3 ±0.47 and 44.11 ±0.89 Ma. The data obtained revealed that continent-continent collision in the Paleocene together with the initiation of the closure of the Neo-Tethys took place between the Anatolide-Tauride Platform and Sakarya Plate from the end of the Cretaceous. The shoshonotic granite may cooled in the Middle Paleocene, as regards the subduction-accretion zone in which subduction impacts have been observed. The medium-K calc-alkaline magmatic products in the region were formed by partial melting of the continental lithospheric mantle caused by the upwelling of asthenospheric mantle after the subducted slab was delaminated.
    Źródło:
    Geological Quarterly; 2022, 66, 2; art. no.13
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal investigations of PCM enhanced electronics cooling
    Autorzy:
    Felczak, Mariusz
    Więcek, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/114610.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    heat exchange
    phase change materials
    thermal impedance
    cooling of electronic systems
    Opis:
    The paper presents experimental results of PCM (Phase Change Material) enhanced cooling system. The investigations were focused on obtaining the best results of the cooling system during its start-up. The latent heat of phase change material was used to decrease temperature of the cooled electronic device. Comparison of a standard heat sink available on the market and the same heat sink filled with PCM applications was done. Temperature was monitored and registered during device start-up until its thermal steady state. It was done using contact and IR temperature measurement methods. PCMs usage enabled to absorb heat during electronic device start-up. The paper proves that using PCMs it is possible to delay temperature rise during electronic devices heating.
    Źródło:
    Measurement Automation Monitoring; 2019, 65, 2; 44-47
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a two-phase thermosyphon loop with minichannels and a minipump in computer cooling
    Autorzy:
    Bieliński, H.
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240132.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermosyphon loop
    two phase flow
    computer cooling
    obieg termosyfonowy
    przepływ dwufazowy
    chłodzenie komputera
    Opis:
    This paper focuses on the computer cooling capacity using the thermosyphon loop with minichannels and minipump. The one-dimensional separate model of two-phase flow and heat transfer in a closed thermosyphon loop with minichannels and minipump has been used in calculations. The latest correlations for minichannels available in literature have been applied. This model is based on mass, momentum, and energy balances in the evaporator, rising tube, condenser and the falling tube. A numerical analysis of the mass flux and heat transfer coefficient in the steady state has been presented.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 1; 3-16
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Cooling Rate after Homogenization on the Microstructure and Properties of 2017a Alloy Billets for Extrusion with Solution Heat Treatment on the Press
    Autorzy:
    Woźnicki, A.
    Leśniak, D.
    Włoch, G.
    Pałka, P.
    Leszczyńska-Madej, B.
    Wojtyna, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355500.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    2017A alloy
    cooling rate after homogenization
    θ (Al2Cu) phase particles precipitation
    Opis:
    The influence of cooling rate after homogenization on the 2017A alloy microstructure was analysed. The capability of the θ (Al2Cu) particles, precipitated during various homogenization coolings, for rapid dissolution was estimated. For this purpose, the DSC test was used to determine the effect of the cooling rate after homogenization on the course of melting during a rapid heating. Moreover, the samples after solution heat treatment (with short time annealing) and ageing, were subjected to the microstructure investigations and the microhardness of grains interiors measurements. It was found that cooling after homogenization at 160 °C/h is sufficient for precipitation of fine θ phase particles, which dissolve during the subsequent rapid heating. The cooling at 40 °C/h, causes the precipitation of θ phase in the form of large particles, incapable of further fast dissolution.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1663-1670
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of Electrospun Composite PEG/PVP Phase-Change Nanofibers and their Application in Cigarette Cooling Filters
    Autorzy:
    Chen, Chen
    Li, Liqun
    Qiao, Yuemei
    Guo, Chunsheng
    Ye, Yajun
    Du, He
    Powiązania:
    https://bibliotekanauki.pl/articles/24200970.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    electrospun nanofiber
    phase-change material
    cigarette cooling filter
    PEG
    polyethylene glycol
    PVP
    polyvinylpyrrolidone
    PCM
    Opis:
    Composite phase-change nanofibers were prepared by electrospinning with polyethylene glycol (PEG) as the phase-change material (PCM) and polyvinylpyrrolidone (PVP) as the carrier matrix. The high PEG content endowed the nanofibers with an excellent cooling effect and significantly reduced the smoke temperature. For PEG70/PVP nanofibers, the smoke temperature can be decreased 45℃ at the 8th puff, and be kept below 45℃. The cooling test proved that the electrospun PEG/PVP phase-change nanofibers exhibited a desirable cooling performance, improving the comfort of cigarette products. And the composite PEG/PVP phase-change nanofibers present great potential as the cooling cigarette filter material for HnB tobacco application.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2023, 31, 3; 9-13
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accounting for the random character of nucleation in the modelling of phase transformations in steels
    Autorzy:
    Poloczek, Łukasz
    Kuziak, Roman
    Foryś, Jakub
    Szeliga, Danuta
    Pietrzyk, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/29519774.pdf
    Data publikacji:
    2023
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    stochastic model
    grain size
    phase transformations
    dislocation density
    cooling of rods
    heterogeneity of the microstructure
    Opis:
    In our earlier work, a stochastic model of multi-stage deformation at elevated temperatures was developed. The model was applied to calculate histograms of dislocation density and grain size at the onset of phase transformation. The histograms were used as input data for the simulation of phase transitions using the traditional deterministic model. Following this approach, microstructural inhomogeneity was predicted for different cooling conditions. The results obtained, showing the effect of dislocation density and inhomogeneity of austenite grain size on the microstructural inhomogeneity of the final product, can be considered reliable as they are based on material models determined in previous publications and validated experimentally. The aim of the present work was to extend the model by taking into account the stochastic nature of nucleation during phase transitions. The analysis of existing stochastic models of nucleation was performed, and a model for ferritic transformation in steels was proposed. Simulations for constant cooling rates as well as for industrial cooling processes of steel rods were performed. In the latter case, uncertainties in defining the boundary conditions and segregation of elements were also considered. The reduction of the computing costs is an important advantage of the model, which is much faster when compared to full field models with explicit microstructure representation.
    Źródło:
    Computer Methods in Materials Science; 2023, 23, 2; 17-28
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of acoustic emission to the analysis of phase transformations in 27MnCrB5-2 steel tests during continuous cooling
    Autorzy:
    Trafarski, Andrzej
    Łazarska, Małgorzata
    Ranachowski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2090676.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    phase transformation
    ultrasonics
    acoustic emission
    continuous cooling
    mikrostruktura
    transformacja fazowa
    ultradźwięki
    emisja akustyczna
    chłodzenie ciągłe
    Opis:
    The goal of the research was to analyze the acoustic emission signal recorded during heat treatment. On a special stand, samples prepared from 27MnCrB5-2 steel were tested. The steel samples were heated to 950°C and then cooled continuously in the air. Signals from phase changes occurring during cooling were recorded using the system for registering acoustic emission. As a result of the changes, Widmanstätten ferrite and bainite structures were observed under a scanning microscope. The recorded acoustic emission signal was analyzed and assigned to the appropriate phase transformation with the use of artificial neural networks.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139389, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The results of the experimental research of the heat transfer coefficient during steam condensation in the tubes of the diesel radiator sections
    Rezultaty ehksperimenthykh issledovanijj koehfficienta teplootdanykh pri kondensacii para v trubkakh teplovoznykh radiatornykh sekcijj
    Autorzy:
    Sklifus, Y.
    Mohyla, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/792234.pdf
    Data publikacji:
    2012
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    experimental research
    heat transfer coefficient
    heat transfer ratio
    diesel locomotive
    phase transition
    cooling system
    power plant
    steam condensation
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Cooling Rate on Properties of Intermetallic Phase in a Complex Al-Si Alloy
    Autorzy:
    Tupaj, M.
    Orłowicz, A. W.
    Mróz, M.
    Trytek, A.
    Markowska, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/380384.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alloy Al-Si
    intermetallic phase
    cooling rate
    silicon crystals
    stop Al-Si
    faza międzymetaliczna
    szybkość chłodzenia
    kryształy krzemu
    Opis:
    The cooling rate is one of the main tools available to the process engineer by means of which it is possible to influence the crystallisation process. Imposing a desired microstructure on a casting as early as in the casting solidification phase widens significantly the scope of technological options at disposal in the process of aluminium-silicon alloy parts design and application. By changing the cooling rate it is possible to influence the course of the crystallisation process and thus also the material properties of individual microstructure components. In the study reported in this paper it has been found that the increase of cooling rate within the range of solidification temperatures of a complex aluminium-silicon alloy resulted in a decrease of values of the instrumented indentation hardness (HIT) and the instrumented indentation elastic modulus (EIT) characterising the intermetallic phase occurring in the form of polygons, rich in aluminium, iron, silicon, manganese, and chromium, containing also copper, nickel, and vanadium. Increased cooling rate resulted in supersaturation of the matrix with alloying elements.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 125-128
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of phenomena in solid state for the steel casting cooled by liquid
    Autorzy:
    Kulawik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381245.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat treatment
    phase transformation
    convection
    cooling process
    liquid coolant
    obróbka cieplna
    przemiana fazowa
    konwekcja
    stygnięcie odlewu
    płyn niskokrzepnący
    Opis:
    In this paper a mathematical model of cooling process for steel castings is presented. Effect of convective motion of the coolant on material structure after cooling process is investigated. Mathematical and numerical model based on Generalized Difference Method for axysimmertric elements is used. To solve the Navier-Stokes equation the characteristic based split scheme (CBS) has been applied. The solution of the heat transport equation with the convective term has been obtained by a stabilized meshless method. To determine of the phase transformation the macroscopic model built on the basis of Time Temperature Transformation diagrams for continuous cooling of medium-carbon steel has been used. The temporary temperature fields, the phase transformation, thermal and structural strains for the cooled element and the fields of temperature and velocity for the coolant have been determined.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 135-138
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analysis and PCM selection for adsorption chiller aided by energy storage supplied from the district heating system
    Autorzy:
    Karwacki, Jarosław
    Kwidziński, Roman
    Leputa, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2204066.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal sorption cooling
    phase change material
    thermal energy storage
    district heating
    adsorption
    energy management
    mathematical modelling
    load shifting
    efficiency
    Opis:
    The paper presents a theoretical analysis of thermal energy storage filled with phase change material (PCM) that is aimed at optimization of an adsorption chiller performance in an air-conditioning system. The equations describing a lumped parameter model were used to analyze internal heat transfer in the cooling installation. Those equations result from the energy balances of the chiller, PCM thermal storage unit and heat load. The influence of the control of the heat transfer fluid flow rate and heat capacity of the system components on the whole system operation was investigated. The model was used to validate the selection of Rubitherm RT62HC as a PCM for thermal storage. It also allowed us to assess the temperature levels that are likely to appear during the operation of the system before it will be constructed.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 4; 135--169
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method of high heat flux removal by usage of liquid spray cooling
    Autorzy:
    Smakulski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/239973.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    critical heat flux
    spray cooling
    two-phase heat transfer
    numerical simulation
    krytyczny strumień ciepła
    chłodzenie natryskowe
    wymiana ciepła
    symulacja numeryczna
    Opis:
    High heat flux removal are important issue in many perspective applications such as computer chips, laser diode arrays, or boilers working on supercritical parameters. Electronic microchips constructed nowadays are model example of high heat flux removal, where the cooling system have to maintain the temperature below 358 K and take heat flux up to 300 W/cm2. One of the most efficient methods of microchips cooling turns out to be the spray cooling method. Review of installations has been accomplished for removal at high heat flux with liquid sprays. In the article are shown high flux removal characteristic and dependences, boiling critical parameters, as also the numerical method of spray cooling analysis.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 3; 173-184
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of phase transformation model for the simulation of controlled cooling of bainitic steel tubes
    Identyfikacja modelu przemian fazowych dla potrzeb symulacji kontrolowanego chłodzenia rur ze stali bainitycznych
    Autorzy:
    Kuziak, R.
    Radwański, K.
    Molenda, R.
    Mazur, A.
    Broll, J.
    Pietrzyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/181466.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
    Tematy:
    phase transformations
    JMAK model
    tubes of bainitic steels
    numerical simulations of tubes cooling
    przemiany fazowe
    model JMAK
    rury ze stali bainitycznych
    modelowanie numeryczne chłodzenia rur
    Opis:
    JMAK (Johnson-Mehl-Avrami-Kolmogorov) equation was adapted to simulation of phase transformations during cooling of bainitic steel tubes. The model was identified on the basis of the results obtained from the JMatPro software. Numerical tests for various cooling schedules showed model’s capability to predict a volume fraction of microstructure constituents of the tubes. The model was implemented into FE code for the simulation of tubes cooling. For the sake of the model capabilities, three cooling methods were considered: (i) free cooling in the air, (ii) cooling with the pressurised air, (iii) cooling with the water mist. Both symmetrical and asymmetrical cooling conditions were considered. The volume fractions of the tube’s microstructure constituents were calculated for each cooling conditions.
    W artykule adaptowano model JMAK (Johnson-Mehl-Avrami-Kolmogorov) do symulacji numerycznej przemian fazowych w procesie chłodzenia rur ze stali bainitycznych. Identyfikację modelu przemian fazowych przeprowadzono na podstawie wyników obliczeń wykonanych za pomocą programu komputerowego JMatPro. Badania numeryczne, przeprowadzone dla różnych metod chłodzenia rur, pokazały możliwości obliczeniowe opracowanego modelu, które obejmują przewidywania udziałów objętościowych składników mikrostruktury stali podczas chłodzenia po austenityzacji. Opracowany model numeryczny przemian fazowych implementowano w kodzie opartym na metodzie elementów skończonych (MES), symulującym proces chłodzenia rur. Obliczenia przeprowadzono dla następujących warunków chłodzenia: (i) chłodzenie w spokojnym powietrzu, (ii) chłodzenie sprężonym powietrzem, (iii) chłodzenie mgłą wodno-powietrzną. Dla każdego sposobu chłodzenia, obliczono udziały objętościowe składników mikrostruktury rur.
    Źródło:
    Prace Instytutu Metalurgii Żelaza; 2018, T. 70, nr 4, 4; 24-33
    0137-9941
    Pojawia się w:
    Prace Instytutu Metalurgii Żelaza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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