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    Wyświetlanie 1-14 z 14
    Tytuł:
    Experimental study of thermal effects in cooling a circular cylinder in lock-on conditions
    Autorzy:
    Gnatowski, Adam
    Sosnowski, Marcin
    Pajdak, Anna
    Sobczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/103023.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    thermal effects
    circular cylinder
    efekty termiczne
    okrągły cylinder
    Opis:
    The paper presents a simple method for determining the phenomenon of unsteady thermal effects in cooling a circular cylinder. The research has been undertaken in order to explain the thermoaerodynamic processes, which are characterized by the turbulent structure of the flow around a stationary rigid heated cylinder cooled by the oscillating flow. The forced convection of heat occurs in the presence of not only random velocity fluctuation but also in the conditions of periodical forms of motion caused mainly by the process of vortex going down and externally formed oscillations of the inflow. The Nusselt number was evaluated at various frequencies of disturbances of the inlet velocity field, especially in lock-on conditions, on the surface of the circular cylinder versus angular location Θ = 0 180°. The subject of the study focuses on the analysis of current state of the problem and development of the method to measure and calculate basic values that characterize unsteady processes of thermal effects on the circular cylinder surface and indication of the directions of further work.
    Źródło:
    Advances in Science and Technology. Research Journal; 2018, 12, 2; 42-51
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Random vortex method in numerical analysis of 2D flow around circular cylinder
    Autorzy:
    Kostecki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/178682.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    vorticity
    vortex method
    flow instability
    circular cylinder
    boundary element method
    Opis:
    A combination of the vortex method and the boundary element method is used here to predict the two-dimensional flow field around a circular cylinder. Cylindrical structures experience strong hydrodynamic loading, due to vortex detachment from the both sides of cylinder during the flow. Thus, the practical meaning of such calculation is significant particularly in offshore oil and gas engineering as well as in the bridge and hydraulic structure engineering. This paper presents the mathematical formulation of the vortex method for the velocity and vorticity field calculation. The calculated velocity and vorticity fields are then used to predict the pressure distribution on the cylinder surface by the boundary element method. The resulting pressure on the cylinder, the Strouhal number and the length of the base recirculation zone are compared with solutions of other numerical methods and experiments, and a good agreement is achieved.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 4; 57-63
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulations of linearly stratified flow past submerged bodies
    Autorzy:
    Ma, W.
    Li, Y.
    Ding, Y.
    Hu, K.
    Lan, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/259150.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    stratified flow
    circular cylinder
    internal wave
    Suboff
    equation of state
    Opis:
    In this study, a methodology was presented to predict density stratified flows in the near-field of submerged bodies. The energy equation in temperature form was solved coupled with momentum and mass conservation equations. Linear stratification was achieved by the definition of the density as a function of temperature. At first, verifications were performed for the stratified flows passing a submerged horizontal circular cylinder, showing excellent agreement with available experimental data. The ability of the method to cope with variable density was demonstrated. Different turbulence models were used for different Re numbers and flow states. Based on the numerical methods proposed in this paper, the stratified flow was studied for the real scale benchmark DAPRA Suboff submarine. The approach used the VOF method for tracing the free surface. Turbulence was implemented with a k − ω based Detached Eddy Simulation (DES) approach. The effects of submarine speed, depth and density gradient on the free surface wave pattern were quantitatively analyzed. It was shown that, with the increasing of the speed of the submarine, the wavelength and wave height of the free surface wave were gradually increasing. The wave height of the free surface wave was gradually reduced as the submarine’s depth increased. Relative to the speed and submarine depth, the changes of the gradient density gradient have negligible effects on the free surface wave field.
    Źródło:
    Polish Maritime Research; 2018, S 3; 68-77
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unconfined laminar nanofluid flow and heat transfer around a rotating circular cylinder in the steady regime
    Autorzy:
    Bouakkaz, R.
    Salhi, F.
    Khelili, Y.
    Quazzazi, M.
    Talbi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/240108.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluid
    rotating circular cylinder
    forced convection
    steady regime
    obracanie
    cylinder okrągły
    konwekcja wymuszona
    Opis:
    In this work, steady flow-field and heat transfer through a copper-water nanofluid around a rotating circular cylinder with a constant nondimensional rotation rate α varying from 0 to 5 was investigated for Reynolds numbers of 5–40. Furthermore, the range of nanoparticle volume fractions considered is 0–5%. The effect of volume fraction of nanoparticles on the fluid flow and heat transfer characteristics are carried out by using a finite-volume method based commercial computational fluid dynamics solver. The variation of the local and the average Nusselt numbers with Reynolds number, volume fractions, and rotation rate are presented for the range of conditions. The average Nusselt number is found to decrease with increasing value of the rotation rate for the fixed value of the Reynolds number and volume fraction of nanoparticles. In addition, rotation can be used as a drag reduction technique.
    Źródło:
    Archives of Thermodynamics; 2017, 38, 2; 3-20
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unconfined laminar nanofluid flow and heat transfer around a rotating circular cylinder dissipating uniform heat flux in the steady regime
    Autorzy:
    Bouakkaz, Rafik
    Ouali, Abded El Ouahed
    Khelili, Yacine
    Faouzi, Salhi
    Tiauiri, Ilyes
    Powiązania:
    https://bibliotekanauki.pl/articles/240386.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper nanoparticles
    rotating circular cylinder
    dissipating uniform heat flux
    steady regime
    Opis:
    In this work, steady flow-field and heat transfer through a copper-water nanofluid around a rotating circular cylinder, dissipating uniform heat flux, with a constant non-dimensional rotation rate varying from 0 to 5 was investigated numerically using a finite-volume method for Reynolds numbers from the range 10–40. Furthermore, the range of nanoparticle volume fractions considered is 0–5%. The variation of the local and the average Nusselt numbers with Reynolds number, volume fractions, and rotation rate are presented for the range of conditions. The average Nusselt number is found to increase with increasing the nanoparticle volume fractions and decrease with increasing value of the rotation rate.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 4; 3-20
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical analysis of oscillating flow around a cylinder
    Autorzy:
    Gnatowska, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/122556.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    mathematical modelling
    unsteady flow phenomena
    circular cylinder
    modelowanie matematyczne
    niestacjonarne zjawiska przepływowe
    cylinder kołowy
    Opis:
    This paper presents the numerical model of the measuring stand - the wind tunnel, in which there is fixed a cylinder with a turbulent inlet oscillating stream. The aim of this work is the juxtaposition and comparison of characteristic values concerning the oscillating turbulent flow around the cylinder, obtained from the experiment conducted in the wind tunnel at the Institute of Thermal Machinery with the data obtained as a result of numerical modelling of unsteady phenomena. The model discussed in this paper was created using a commercial program ANSYS FLUENT that is used for mathematical modelling of flow and heat transfer processes. The expected outcome of this study is possibility of the numerical modelling of the stand concerning the analogous unsteady flows without significant investment of time. Comparison of longitudinal and transverse velocity profiles in aerodynamic wake and the pressure coefficient distributions on the cylinder surface show similarities between experimental and numerical studies.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 3; 59-66
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of wind structure and aspect ratio of circular cylinders on mean wind pressure coefficient
    Autorzy:
    Lipecki, T
    Jamińska, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933975.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Gdańska
    Tematy:
    wind tunnel
    mean wind pressure coefficient
    circular cylinder
    wind structure
    aspect ratio
    Opis:
    The paper presents analyses of the mean wind pressure coefficient distribution on the surfaces of circular cylinders. The experiment was performed in a boundary layer wind tunnel in the Wind Engineering Laboratory in Cracow, Poland. Three models were examined in the wind tunnel. The influence of the aspect ratio and wind parameters (mean wind speed profile, turbulence intensity profile, power spectral density functions) on the mean wind pressure coefficient distribution and its standard deviation was considered during the tests.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2012, 16, 3-4; 203-218
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-simple elastic materials with double porosity structure
    Autorzy:
    De Cicco, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/38695685.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    strain-gradient theory
    porous solids
    chiral materials
    torsion of a circular cylinder
    Opis:
    This paper is concerned with a strain gradient theory of elastic materials that have a double porosity structure. Firstly, we present the basic equations and the boundary conditions of the nonlinear theory. Then, we derive the equations of the linear theory and present the constitutive equations for chiral materials. The theory is applied to study the deformation of a chiral cylinder. The materials with a double porosity are of interest in geophysics and in mechanics of bone.
    Źródło:
    Archives of Mechanics; 2022, 74, 2-3; 127-142
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of forced convection of nanofluid around a circular cylinder
    Autorzy:
    Korib, Kamel
    Ihaddadene, Nabila
    Bouakkaz, Rafik
    Khelili, Yacine
    Powiązania:
    https://bibliotekanauki.pl/articles/240282.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    copper nanoparticles
    heat transfer
    circular cylinder
    steady regime
    walec kołowy
    wymiana ciepła
    nanocząstki miedzi
    Opis:
    In this study a steady flow-field and heat transfer through a copper-water nanofluid around a circular cylinder, under the influence of both the standard thermal boundary conditions, i.e., uniform heat flux and constant wall temperature) was investigated numerically by using a finitevolume method for Reynolds numbers from the range 10–40. Furthermore, the range of nanoparticle volume fractions considered is 0–5%. The variation of the local and the average Nusselt numbers with Reynolds number, and volume fractions are presented for the range of conditions. The average Nusselt number is found to increase with increasing the nanoparticle volume fractions.
    Źródło:
    Archives of Thermodynamics; 2019, 40, 2; 3-16
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical computation of low Reynolds number viscous flow past bluff bodies
    Autorzy:
    Tarafder, Md. Shahjada
    Mursaline, Miad Al
    Powiązania:
    https://bibliotekanauki.pl/articles/1839825.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    przepływ
    płyn lepki
    liczba Reynoldsa
    współczynnik oporu
    viscous flow
    low Reynolds number
    SIMPLE algorithm
    circular cylinder
    square cylinder
    drag coefficient
    Opis:
    This article presents a two-dimensional steady viscous flow simulation past circular and square cylinders at low Reynolds numbers (based on the diameter) by the finite volume method with a non-orthogonal body-fitted grid. Diffusive fluxes are discretized using central differencing scheme, and for convective fluxes upwind and central differencing schemes are blended using a ‘deferred correction’ approach. A simplified pressure correction equation is derived, and proper under-relaxation factors are used so that computational cost is reduced without adversely affecting the convergence rate. The governing equations are expressed in Cartesian velocity components and solution is carried out using the SIMPLE algorithm for collocated arrangement of variables. The mesh yielding grid-independent solution is then utilized to study, for the very first time, the effect of the Reynolds number on the separation bubble length, separation angle, and drag coefficients for both circular and square cylinders. Finally, functional relationships between the computed quantities and Reynolds number (Re) are proposed up to Re = 40. It is found that circular cylinder separation commences between Re= 6.5-6.6, and the bubble length, separation angle, total drag vary as Re, Re-0.5, Re-0.5 respectively. Extrapolated results obtained from the empirical relations for the circular cylinder show an excellent agreement with established data from the literature. For a square cylinder, the bubble length and total drag are found to vary as Re and Re-0.666, and are greater than these for a circular cylinder at a given Reynolds number. The numerical results substantiate that a square shaped cylinder is more bluff than a circular one.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 133-157
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MHD free convection-radiation interaction in a porous medium - part II: soret/dufour effects
    Autorzy:
    Vasu, B.
    Gorla, Rama Subba Reddy
    Murthy, P. V. S. N.
    Prasad, V. R.
    Beg, O. A.
    Siddiqa, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/266156.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    materiały porowate
    pole magnetyczne
    magnetohydrodynamika
    non-Darcy porous media transport
    magnetic field
    horizontal circular cylinder
    Soret number
    Dufour number
    Opis:
    This paper is focused on the study of two dimensional steady magnetohydrodynamics heat and mass transfer by laminar free convection from a radiative horizontal circular cylinder in a non-Darcy porous medium by taking into account of the Soret/Dufour effects. The boundary layer equations, which are parabolic in nature, are normalized into non-similar form and then solved numerically with the well-tested, efficient, implicit, stable Keller–Box finite-difference scheme. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the local skin friction, Nusselt number and Sherwood number for several values of the parameters, namely the buoyancy ratio parameter, Prandtl number, Forchheimer number, magnetohydrodynamic body force parameter, Soret and Dufour numbers. The dependency of the thermophysical properties has been discussed on the parameters and shown graphically. Increasing the Forchheimer inertial drag parameter reduces velocity but elevates temperature and concentration. Increasing the Soret number and simultaneously reducing the Dufour number greatly boosts the local heat transfer rate at the cylinder surface. A comparative study of the previously published and present results in a limiting sense is made and an excellent agreement is found between the results.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 157-175
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MHD free convection-radiation interaction in a porous medium - part I: numerical investigation
    Autorzy:
    Vasu, B.
    Gorla, R. S. R.
    Murthy, P. V. S. N.
    Prasad, V. R.
    Bég, O. Anwar
    Siddiqa, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/266199.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    pole magnetyczne
    metoda Keller-Box
    nośnik porowaty
    implicit finite difference scheme
    Keller-Box method
    magnetic field
    horizontal circular cylinder
    Opis:
    A numerical investigation of two dimensional steady magnetohydrodynamics heat and mass transfer by laminar free convection from a radiative horizontal circular cylinder in a non-Darcy porous medium is presented by taking into account the Soret/Dufour effects. The boundary layer conservation equations, which are parabolic in nature, are normalized into non-similar form and then solved numerically with the well-tested, efficient, implicit, stable Keller–Box finite-difference scheme. We use simple central difference derivatives and averages at the mid points of net rectangles to get finite difference equations with a second order truncation error. We have conducted a grid sensitivity and time calculation of the solution execution. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the local skin friction, Nusselt number and Sherwood number for several values of the parameters. The dependency of the thermophysical properties has been discussed on the parameters and shown graphically. The Darcy number accelerates the flow due to a corresponding rise in permeability of the regime and concomitant decrease in Darcian impedance. A comparative study between the previously published and present results in a limiting sense is found in an excellent agreement.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 198-218
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Semi-analytical solution of functionally graded circular short hollow cylinder subject to transient thermal loading
    Półanalityczne rozwiązanie dla krótkiego, wydrążonego, kolistego cylindra gradientowego poddanego przejściowemu obciążeniu termicznemu
    Autorzy:
    Eskandari-Jam, J.
    Rahmati-Nezhad, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/139735.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    functionally graded circular hollow cylinder
    finite length
    thermal stresses
    multi-layered approach
    kolisty wydrążony cylinder gradientowy
    skończona długość
    obciążenia termiczne
    podejście wielowarstwowe
    Opis:
    In this paper, by using a semi-analytical solution based on multi-layered approach, the authors present the solutions of temperature, displacements, and transient thermal stresses in functionally graded circular hollow cylinders subjected to transient thermal boundary conditions. The cylinder has finite length and is subjected to axisymmetric thermal loads. It is assumed that the functionally graded circular hollow cylinder is composed of N fictitious layers and the properties of each layer are assumed to be homogeneous and isotropic. Time variations of the temperature, displacements, and stresses are obtained by employing series solving method for ordinary differential equation, Laplace transform techniques and a numerical Laplace inversion.
    W artykule zaprezentowano rozwiązanie dla temperatury, przemieszczeń i naprężeń w stanie nieustalonym w krótkich, wydrążonych, kolistych cylindrach gradientowych przy warunkach brzegowych odpowiadających przejściowemu obciążeniu termicznemu. Rozwiązanie uzyskano metodą półanalityczną opartą na podejściu wielowarstwowym. Rozważany cylinder ma skończoną długość i jest poddany obciążeniom termicznym o symetrii osiowej. Zakłada się, że wydrążony, kolisty cylinder gradientowy składa się z N fikcyjnych warstw, a właściwości każdej z warstw są izotropowe i jednorodne. Zmiany w czasie temperatury, przemieszczeń i naprężeń uzyskano wykorzystując metodę rozwinięcia na szereg dla zwyczajnych równań różniczkowych, metody transformacji Laplace’a i metodę cyfrową odwrotnego przekształcania Laplace’a.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 3; 409-432
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of the spatial characteristics technique with the view of estimating the explosion wave impact on the stuck drilling string zone
    Wykorzystanie techniki charakterystyk przestrzennych do określania wpływu fali uderzeniowej na przychwyconą kolumnę przewodów wiertniczych
    Autorzy:
    Moisyshyn, V.
    Yacyshyn, V.
    Vytyaz, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/219826.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metoda charakterystyk przestrzennych
    asymetria
    sprężystość dynamiczna
    odkształcenie
    walec grubościenny
    przekrój kołowy
    naprężenie
    fala uderzeniowa
    asymmetric problem of dynamic elasticity
    spatial characteristics technique
    stress caused deformation state of a thick walled circular cylinder
    explosion wave
    Opis:
    Studied here are the results of the asymmetric problem solution of the thick walled circular cylinder elasticity using the spatial characteristics technique. The practical implementation of the solution of the problem is based on the calculation of the stress-caused deformation state of the stuck drilling string zone affected by the explosion wave action upon the inner wall of the pipe. Suggested here is the technique for determining axual and circular stress on the drill pipe wall as well as the radial displacements of the stuck drill pipe outer surface under the action of the explosion shock wave. The above technique enables to make a sound selection of the cylindrical explosive charge weight in order to avoid the residual strain during the drilling string shaping off and uncoupling the threaded joints or to prevent them from exceeding the admissible level.
    W artykule przedstawiono wyniki uzyskane przy pomocy asymetrycznego rozwiązania zagadnienia związanego z elastycznością grubościennego walca o przekroju kołowym, w oparciu o metodę charakterystyk przestrzennych. Praktyczne zastosowanie tego rozwiązania opiera się na obliczeniu stanu odkształcenia strefy przy przychwyconej w otworze kolumnie przewodów wiertniczych spowodowanego naprężeniami wskutek oddziaływania fali uderzeniowej na wewnętrzne ściany przewodów. W pracy zaproponowano metodę określenia naprężenia osiowego i obwodowego działającego na ściany przewodów wiertniczych oraz przemieszczenia promieniowego u umocowanego przewodu pod wpływem oddziaływania fali uderzeniowej po wybuchu. Technika powyższa umożliwia dokonanie właściwego doboru wielkości ładunku wybuchowego w kształcie walca w celu uniknięcia naprężeń resztkowych w kolumnie przewodów wiertniczych, które mogłyby doprowadzić do jego odkształcenia lub poluzowania połączeń gwintowanych lub dla utrzymania wielkości tych naprężeń w dopuszczalnych normach.
    Źródło:
    Archives of Mining Sciences; 2012, 57, 3; 601-618
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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