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    Wyświetlanie 1-3 z 3
    Tytuł:
    Ceramic Mould Internal Structure Anomalies in the Lost Wax Process
    Autorzy:
    Biernacki, R.
    Grześ, J.
    Haratym, R.
    Tomasik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380913.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ceramic mould
    anisotropy properties
    fractal dimension
    heat transfer coefficient
    formy ceramiczne
    właściwości anizotropowe
    wymiar fraktalny
    współczynnik przewodnictwa cieplnego
    Opis:
    The paper analyzes the structure of the ceramic mould, which include discussion about its structure creation. The results of research relate to the strength of the ceramic mould and its thermophysical properties. Structural anisotropy was found and its influence on the mould surface morphology depending on its position with respect to the sprue in the assembly set. The paper also presents evaluation of microgeometry of patterns, ceramic mould and casts produced in a joint production process. Last part includes the results of the fractal dimension measurements of ceramic mould cross-sections. The analysis was based on the mould porosity. For the analyzed structures the percentage of pores and linear fractal dimension was determined, using the line counting dimension method (LCD), which is a modification of box counting dimension method (BCD).
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 57-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of thermal and flow characteristics of the condensation of refrigerant zeotropic mixtures in minichannels
    Autorzy:
    Bohdal, T.
    Widomska, K.
    Sikora, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240470.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    minichannels
    condensation
    zeotropic mixture
    heat transfer coefficient
    pressure drop
    minikanał
    kondensacja
    mieszanina zeotropowa
    współczynnik przewodnictwa cieplnego
    spadek ciśnienia
    Opis:
    The paper presents the results of experimental heat transfer and pressure drop during condensation of the single component refrigerant R134a and zeotropic mixtures R404A, R407C, and R410A in tube minichannels of internal diameter from the range 0.31–3.30 mm. The local values and the average of heat transfer coefficient and pressure drop in the whole range of the change in mass quality were measured. On the basis of the obtained test results there was illustrated the influence of the change of mass vapor quality, the mass flux density, and the inner diameter of channel on the studied parameters. These results were compared with the calculation results based on the relations postulated by other authors. The discrepancy range was ± 50%. On the basis of given test results own correlation was developed to calculate the heat transfer coefficient and pressure drop of tested refrigerants which presents the obtained results in a range of discrepancy of ±25%.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 2; 41-69
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of flow boiling heat transfer coefficient for carbon dioxide in minichannels and conventional channels
    Autorzy:
    Mikielewicz, D.
    Jakubowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/240733.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat transfer coefficient
    flow boiling
    carbon dioxide
    minichannels
    współczynnik przewodnictwa cieplnego
    wrzenie w przepływie
    dwutlenek węgla
    minikanał
    Opis:
    In the paper presented are the results of calculations using authors own model to predict heat transfer coefficient during flow boiling of carbon dioxide. The experimental data from various researches were collected. Calculations were conducted for a full range of quality variation and a wide range of mass velocity. The aim of the study was to test the sensitivity of the in-house model. The results show the importance of taking into account the surface tension as the parameter exhibiting its importance in case of the flow in minichannels as well as the influence of reduced pressure. The calculations were accomplished to test the sensitivity of the heat transfer model with respect to selection of the appropriate two-phase flow multiplier, which is one of the elements of the heat transfer model. For that purpose correlations due to Müller-Steinhagen and Heck as well as the one due to Friedel were considered. Obtained results show a good consistency with experimental results, however the selection of two-phase flow multiplier does not significantly influence the consistency of calculations.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 2; 89-106
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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