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Wyszukujesz frazę "wall temperature" wg kryterium: Temat

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Effect of viscous dissipation and thermal radiation on heat transfer over a non-linearly stretching sheet through porous medium
    Autorzy:
    Nandeppanavar, M. M.
    Siddalingappa, M. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/264505.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    materiały porowate
    metoda Runge-Kutty
    promieniowanie cieplne
    porous media
    viscous dissipation
    Runge-Kutta method
    thermal radiation
    wall temperature gradient
    wall temperature
    Opis:
    In this present paper, we have discussed the effects of viscous dissipation and thermal radiation on heat transfer over a non-linear stretching sheet through a porous medium. Usual similarity transformations are considered to convert the non-linear partial differential equation of motion and heat transfer into ODE’s. Solutions of motion and heat transfer are obtained by the Runge-Kutta integration scheme with most efficient shooting technique. The graphical results are presented to interpret various physical parameters of interest. It is found that the velocity profile decreases with an increase of the porous parameter asymptotically. The temperature field decreases with an increase in the parametric values of the Prandtl number and thermal radiation while with an increase in parameters of the Eckert number and porous parameter, the temperature field increases in both PST (power law surface temperature) and PHF (power law heat flux) cases. The numerical values of the non-dimensional wall temperature gradient and wall temperature are tabulated and discussed.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 461-474
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation effects on MHD boundary layer flow and heat transfer over a nonlinear stretching surface with variable wall temperature in the presence of non-uniform heat source/sink
    Autorzy:
    Devi, S. P. A.
    Agneeshwari, M.
    Raj, J. W. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/947377.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    magnetohydrodynamika
    promieniowanie
    źródło ciepła
    MHD
    radiation
    non-uniform heat source/sink
    variable wall temperature
    Opis:
    In this paper, an investigation is made to analyze the effects of radiation on an MHD boundary layer flow and heat transfer over a nonlinear stretching surface with variable wall temperature and non-uniform heat source/sink. A suitable similarity transformation is used to transform the governing nonlinear partial differential equations into a system of nonlinear ordinary differential equations by using the Nachtsheim Swigert shooting iteration technique together with the fourth order Runge Kutta method. The effects of various physical parameters over a dimensionless velocity and dimensionless temperature are presented graphically. The numerical results for the skin friction co-efficient and non-dimensional rate of heat transfer are presented and discussed for several sets of values of the parameters. Comparisons of numerical results are made with the earlier published results under limiting cases.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 289-305
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation and control of nanoparticle size distribution in a high temperature reactor
    Autorzy:
    Agboola, O.S.
    Kolesnikov, A.
    Sadiku, E.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778301.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    regulator temperatury
    nanocząstki
    wielkość cząstek
    średnia średnica cząstek i ścian
    controller
    nanoparticles
    particle size
    average particle diameter and wall temperature
    Opis:
    This work focuses on the modeling, simulation and control of particle size distribution (PSD) during nanoparticle growth with the simultaneous chemical reaction, nucleation, condensation, coagulation and convective transport in a high temperature reactor. Firstly, a model known as population balance model was derived. This model describes the formation of particles via nucleation and growth. Mass and energy balances in the reactor were presented in order to study the effect of particle size distribution for each reaction mechanisms on the reactor dynamics, as well as the evolution of the concentrations of species and temperature of the continuous phase. The models were simulated to see whether the reduced population balance can be used to control the particle size distribution in the high temperature reactor. The simulation results from the above model demonstrated that the reduced population balance can be effectively used to control the PSD. The proposed method "which is the application of reduced population balance model" shows that there is some dependence of the average particle diameter on the wall temperature and the model can thus be used as a basis to synthesize a feedback controller where the manipulated variable is the wall temperature of the reactor and the control variable is the average particle diameter at the outlet of the reactor. The influence of disturbances on the average particle diameter was investigated and controlled to its new desired set point which is 1400nm using the proportional-integral-derivative controllers (PID controllers). The proposed model was used to control nanoparticle size distribution at the outlet of the reactor.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 1; 5-13
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simple method to estimate cell wall extensibility coefficient by using only two cardinal numbers
    Autorzy:
    Pietruszka, M
    Powiązania:
    https://bibliotekanauki.pl/articles/58740.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    cell wall
    plant cell
    growing plant
    temperature
    extensibility coefficient
    Opis:
    In this short communication we consider the extensibility properties of the cell wall. This is accomplished by a heuristically motivated equation for the expanding volume of the cell. The experimentally determined characteristic time t0 and temperature T0 are the only numbers required for evaluating the effective yielding coefficient Ф(t, T) in the respective time and temperature domains.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2009, 78, 4; 269-270
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    System of heat supply ’ad hoc’ with solar wall
    Autorzy:
    Shapoval, S.
    Zhelykh, V.
    Kapalo, P.
    Venhryn, I.
    Dacko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/104281.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    solar wall
    temperature
    specific heat capacity
    coefficient of performance system
    Opis:
    For the implementation of solar thermal installations it is necessary to optimize energy-efficient external enclosures due to the correct installation and design of these units at different orientations of external walls. Investigated the effectiveness of using solar energy in the conditions of shortage of energy in Ukraine. Ad hoc solar wall look at two modes of its operation. Given a variety of graphical, analytical expressions for understanding the operation of the proposed design. Given these changes of the heat carrier temperature solar wall income the amount of the specific instantaneous heat output through time. The article considers the possibility of using experimental models, solar wall under the influence of her unfavourable ad hoc factors. It is established that the proposed model is solar wall is quite effective and can be used in solar heating systems.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 4; 49-56
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the triticale grain moisture content on the spontaneous heating of grain and on the pressure against the silo wall
    Autorzy:
    Kusinska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/24586.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    grain quality
    silo wall
    heating
    temperature
    pressure
    grain
    Triticale
    moisture content
    storage
    Źródło:
    International Agrophysics; 2001, 15, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of temperature on guaiacol peroxidase of Pyrus communis
    Autorzy:
    Saeidian, S.
    Ghasemifar, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/10793.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    temperature effect
    guaiacol
    Peroxidase
    Pyrus communis
    enzyme
    plant growth
    plant development
    cell wall
    Opis:
    Peroxidase (EC 1.11.1.7; donor: hydrogen-peroxide oxidoreductase, POD) is one of the key enzymes controlling plant growth, differentiation and development. The enzyme participates in construction, rigidification and eventual lignification of cell walls, biosynthesis of ethylene from 1-aminocyclopropane-1-carboxylic acid and H2O2, regulation of auxin level through auxin catabolism, protection of tissue from damage and infection by pathogenic microorganisms, the oxidation of indoleacetic acid. For peroxidase activity in wild pears extract one pH optimum was observed at 6.5 that probably belong to atleast one isoenzyme. Activity of peroxidase in presence of guaiacol and H2O2 was optimum after incubation at 40 °C. Maximum activity of peroxidase is 300 % .Activity increased to 240 %, 300 %, 70 % and 10 % after 60 minute incubation at 30, 40, 45 and 60 °C for peroxidase. Incubation at high temperature (70 °C) was accompanied with decrease of activity to 10 % peroxidase activity.
    Źródło:
    International Letters of Natural Sciences; 2013, 05
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mass exchange in adjacent layers of grain material stored in silo
    Autorzy:
    Grochowicz, J.
    Kusinska, E.
    Bilanski, W.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/24068.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    moisture
    wall load
    temperature
    diffusion
    grain
    absorptive property
    moisture migration
    barley
    hygroscopic property
    mass exchange
    cereal
    storage
    Źródło:
    International Agrophysics; 1998, 12, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of temperature-field and stress-field of steel plate concrete composite shear wall in early stage of construction
    Autorzy:
    Sun, Yun
    Guo, Yaojie
    Powiązania:
    https://bibliotekanauki.pl/articles/1853643.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ściana betonowa z blachą stalową
    ściana usztywniająca kompozytowa
    pole temperatury
    pole naprężeń
    analiza termiczna
    pękanie
    faza wczesna
    steel plate concrete wall
    composite shear wall
    temperature field
    stress field
    thermal analysis
    cracking
    early stage
    Opis:
    To study the influence of temperature field and stress field on the cracking of the small thickness steel plate concrete composite shear wall (SPCW) in the early stage of construction. The temperature field and stress field of a 400 mm thickness SPCW was monitored and simulated through experimental research and numerical simulation. Moreover, a series of parameter analyses were carried out by using ANSYS to investigate the distribution of temperature field and stress field of SPCW. Based on the analysis results, some suggestions are put forward for controlling the cracking of SPCW in the early stage of construction. The results show that the temperature stress of 400 mm thickness SPCW in the early stage of construction is small, and there is no crack on the wall surface. For SPCW with thickness less than 800mm, the temperature stress caused by hydration heat in the early stage of construction is small, and the wall will not crack. The parameters such as wall thickness, steel plate thickness, boundary condition and stud space significantly influence the temperature field and stress field distribution of the small thickness SPCW in the early stage of construction, and reasonable maintenance measures can avoid cracking.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 1; 351-366
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Wall Thickness and Mould Temperature on Structure and Properties of Thin Wall Ductile Iron Castings
    Autorzy:
    Górny, M.
    Kawalec, M.
    Witek, G.
    Rejek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382589.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    mechanical properties
    ductile iron
    austenitic ductile iron
    high Ni alloying
    mould temperature
    thin wall casting
    metalografia
    właściwości mechaniczne
    metal ciągliwy
    żeliwo sferoidalne
    Opis:
    The excellent property combination of thin wall ductile iron castings (TWDI), including thin wall alloyed cast iron (e.g. austenitic TWDI) has opened new horizons for cast iron to replace steel castings and forgings in many engineering applications with considerable cost benefits. TWDI is considered as a potential material for the preparation of light castings with good mechanical and utility properties, the cost of which is relatively low. In this study, unalloyed and high Ni-alloyed (25% Ni) spheroidal graphite cast iron, with an austenitic metallic matrix were investigated. The research was conducted for thin-walled iron castings with 2, 3 and 5mm wall thickness, using different mould temperature (20°C, and 160°C) to achieve various cooling rates. The metallographic examinations i.e. characteristic of graphite nodules, metallic matrix, and primary grains of austenite dendrites (in high-nickel NTWDI) and mechanical properties were investigated. The study shows that homogeneity of the casting structure of thin-walled castings varies when changing the wall thickness and mould temperature. Finally, mechanical properties of thin-walled ductile iron castings with ferritic-pearlitic and austenitic metallic matrix have been shown.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 55-59
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the heat insulation layer on the thermally stressed condition of the facade wall
    Autorzy:
    Basok, Borys
    Davydenko, Borys
    Koshlak, Hanna
    Lysenko, Oksana
    Powiązania:
    https://bibliotekanauki.pl/articles/26079345.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    stres temperaturowy
    betonowa ściana elewacyjna
    system grzewczy
    modelowanie numeryczne
    warstwa termoizolacyjna
    temperature stress
    concrete facade wall
    heating system
    numerical modelling
    heat-insulating layer
    Opis:
    The temperature-stress state of the concrete facade wall with a window opening, which is the external enclosing structure of the room with a steel heating device, was investigated by the method of numerical modeling. Estimated studies were performed for winter period when the heating system of the building is functioning. According to the results of solving the system of equations of thermal stress and equation of thermal conductivity, the temperature distribution over the wall volume and distribution of normal and tangential stresses were determined. Areas of the wall where these stresses are maximum were identified. The research was performed for cases of both, absence and presence of a heat-insulating layer on the outer surface of the facade wall. From comparison of the results obtained for these two options, it follows that the external thermal insulation coating not only helps to reduce dissipative heat loss through the facade wall, but also reduces the absolute values of stresses in the concrete wall arising resulting from temperature deformations. In some cases, the sign of stresses changes from stretching (wall without external insulation) to compressive (wall with insulation).
    Źródło:
    Production Engineering Archives; 2022, 28, 2; 123--131
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of the stress state of an erosion-worn tee of the main gas pipeline
    Autorzy:
    Doroshenko, Ya.
    Zapukhliak, V.
    Grudz, Ya.
    Poberezhny, L.
    Hrytsanchuk, A.
    Popovych, P.
    Shevchuk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818501.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    multiphase flow
    gas-dynamic process
    erosion wear
    residual life
    temperature difference
    erosion defect
    allowable wall thickness
    przepływ wielofazowy
    proces gazodynamiczny
    zużycie erozyjne
    trwałość resztkowa
    różnica temperatur
    wada erozji
    Opis:
    Purpose: To investigate the strength of tees with regard to their erosion wear, it is necessary to consider the complex three-dimensional geometric shape of the erosion worn inner surface of the tee. In addition, the study of the strength of the erosion worn tees of the main gas pipelines is complicated by the occurrence of additional stresses caused by changes in the direction of movement of the gas stream, resulting in an uneven pressure distribution in the inner cavity of the tee, and the temperature difference in its walls. Design/methodology/approach: Methodology for complex numerical three-dimensional simulation of the stressed state of tees of the main gas pipelines, taking into account the gas-dynamic processes that occur in the places of these defects, erosion wear of the tee wall, temperature difference in the tee walls. Findings: The acceptable parameters of erosion defects of tees of gas pipelines, and residual life of tees with erosion defects of the wall should be determined. Research limitations/implications: The developed model does not take into account internal corrosion and corrosion products as an additional erosion factor. Further studies plan to develop a model of corrosion-erosion wear of pipeline elements. Practical implications: The developed technique allows determining the location of erosion defects, estimating the strength and determining the residual life of tees with erosion wear of the wall in order to ensure their reliability, to rank such defects according to the degree of danger, to determine which of them are critical and need an immediate repair. Originality/value: Based on the gas-dynamic processes occurring in the internal cavity of the main gas pipelines’ tees, the complex three-dimensional geometric form of wall erosion defects, and temperature difference, the technique of three-dimensional simulation of stress state of the main gas pipelines’ tees is developed
    Źródło:
    Archives of Materials Science and Engineering; 2020, 101, 2; 63--78
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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