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    Wyświetlanie 1-7 z 7
    Tytuł:
    Experimental investigation and characteristics of multiwalled carbon nanotube aqua nanofluids from a flat plate heater surface in a pool
    Autorzy:
    Vasudevan, D.
    Senthil Kumar, D.
    Murugesan, A.
    Vijayakumar, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/201185.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluids
    critical heat flux
    heat transfer coefficient
    boiling
    heat transfer enhancement
    Opis:
    In this experimental investigation, the critical heat flux (CHF) of aqua-based multiwalled carbon nanotube (MWCNT) nanofluids at three different volumetric concentrations 0.2%, 0.6%, and 0.8% were prepared, and the test results were compared with deionized water. Different characterization techniques, including X-ray diffraction, scanning electron microscopy and Fourier transform infrared, were used to estimate the size, surface morphology, agglomeration size and chemical nature of MWCNT. The thermal conductivity and viscosity of the MWCNT at three different volumetric concentrations was measured at a different temperature, and results were compared with deionized water. Although, MWCNT-deionized water nanofluid showed superior performance in heat transfer coefficient as compared to the base fluid. However, the results proved that the critical heat flux is increased with an increase in concentrations of nanofluids.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 3; 547-554
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal stresses in the heated wall of the minichannel
    Autorzy:
    Błasiak, S.
    Musiał, T.
    Piasecka, M.
    Strąk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/114583.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    thermal stress
    distortion
    minichannel
    heat transfer
    boiling
    Opis:
    This paper deals with thermal deformations of the heating foil in a heat exchanger with a rectangular minichannel. Flow boiling heat transfer was achieved to maximize the heat transfer coefficient. As confirmed by the experiments, the deformations resulting from the thermal expansion of the heating foil led to local narrowing of the channel, and consequently distorted flow and less effective heat transfer.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 1; 22-25
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boiling in micro-channels
    Autorzy:
    Hetsroni, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/199886.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micro-channel
    boiling
    pressure drop
    heat transfer
    fluctuation
    Opis:
    Boiling heat transfer in micro-channels is a subject of intense academic and practical interest. Though many heat transfer correlations have been proposed, most were empirically formulated from experimental data. However, hydrodynamic and thermal aspects of boiling in micro-channels are not well understood. Moreover, there are only a few theoretical models that link the heat transfer mechanism with flow regimes in micro-channels. Also, there are discrepancies between different sets of published results, and heat transfer coefficients have either well exceeded, or fallen far below, those predicted for conventional channels. Here we consider these problems with regard to micro-channels with hydraulic diameters ranging roughly from 5 ěm to 500 ěm, to gain a better understanding of the distinct properties of the measurement techniques and uncertainties, the conditions under which the experimental results should be compared to analytical or numerical predictions, boiling phenomenon, as well as different types of micro-channel heat sinks. Two-phase flow maps and heat transfer prediction methods for vaporization in macro-channels are not applicable in micro-channels, because surface tension dominates the phenomena, rather than gravity forces. The models of convection boiling should correlate the frequencies, sizes and velocities of the bubbles and the coalescence processes, which control the flow pattern transitions, together with the heat flux and the mass flux. Therefore, the vapour bubble size distribution must be taken into account. The flow pattern in parallel micro-channels is quite different from that in a single micro-channel. At same values of heat and mass flux, different, time dependent, flow regimes occur in a given micro-channel. At low vapour quality, heat flux causes a sudden release of energy into the vapour bubble, which grows rapidly and occupies the entire channel cross section. The rapid bubble growth pushes the liquid-vapour interface on both caps of the vapour bubble, at the upstream and the downstream ends, and leads to a reverse flow. We term this phenomenon as explosive boiling. One of the limiting operating conditions with flow boiling is the critical heat flux (CHF). The CHF phenomenon is different from that observed in conventional size channels.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 1; 155-163
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the Specific Heat Flux During Boiling of the Dispersed Phase of the Emulsion
    Autorzy:
    Pavlenkо, Anatoliy
    Koshlak, Hanna
    Basok, Borys
    Hrabova, Tatiana
    Powiązania:
    https://bibliotekanauki.pl/articles/27315739.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    steam explosion
    homogenisation
    boiling
    intensification of heat
    mass transfer
    Opis:
    The intensity of heat exchange between the boiling emulsion and the enclosing surfaces is associated with the physical phenomena of the formation, growth, and destruction of vapour bubbles of the low-boiling component in the liquid phase. This article presents a methodology to assess the intensity of heat exchange processes. Using this technique, it is possible to predict the energy parameters of heat exchange equipment and the degree of intensification of heat transfer processes.
    Źródło:
    Rocznik Ochrona Środowiska; 2023, 25; 16--24
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental studies on the effect of the enhancemet of the heating surface on the heat transfer coefficient for boiling in closed volume
    Autorzy:
    Grabowski, M.
    Błachnio, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/95221.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    boiling
    boiling on enhanced surfaces
    heat transfer coefficient
    Intensification of heat exchange
    LabView
    wrzenie
    wrzenie na wzmocnionych powierzchniach
    współczynnik przenikania ciepła
    intensyfikacja wymiany ciepła
    Opis:
    This article presents the results of experimental research on the effect of enhancing the heating surface on the heat transfer coefficient for boiling in a closed volume of ethyl alcohol and isopropyl alcohol. The aim of the research was determination of the impact of heat surfaces enhancements by applying circular cavities on heat transfer coefficient and on vapor structures formation during boiling. The study involved three brass samples with diameters equal to 50 mm, with different enhancements of the heating surface by drilled blind cavities. The research includes investigation of sample without cavities, sample with 133 circular cavities of diameter of 2 mm and sample with 61 circular cavities of diameter of 3 mm. On the basis of the research, the influence of the investigated heat exchange surface enhancement on the intensity of heat exchange was determined. The author’s own interface in the LabView environment for controlling and acquiring measurement data was developed. The boiling process was recorded with a high-speed camera, and based on the obtained video images, the recorded images were analyzed to determine the void fraction. The heat flux density, heat transfer coefficient were calculated and comparative diagrams of the obtained measurement results were made.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2018, 2, 2; 121-130
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza metod obliczeniowych wyznaczania wartości współczynnika wnikania ciepła podczas wrzenia dwutlenku węgla w rurach poziomych
    Analysis of heat transfer coefficient calculation methods for carbon dioxide boiling inside horizontal channels
    Autorzy:
    Sroka, J.
    Witczak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2072723.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    dwutlenek węgla
    wnikanie ciepła
    metody obliczeniowe
    wrzenie
    carbon dioxide
    heat transfer
    calculation methods
    boiling
    Opis:
    Przedstawiono analizę istniejących metod obliczeniowych wyznaczania współczynnika wnikania ciepła podczas wrzenia dwutlenku węgla w rurach poziomych. Stworzono bazę danych eksperymentalnych z literatury dotyczących wrzenia dwutlenku węgla. Obliczono wartości współczynnika wnikania ciepła przy użyciu różnych istniejących metod obliczeniowych. Następnie dokonano porównania obliczonych i eksperymentalnych wartości współczynnika wnikania ciepła.
    The paper present analysis of existing heat transfer coefficient calculation methods for a case of carbon dioxide boiling inside horizontal channels. During the research a data base was prepared comprising the experimental data taken from literature and dealing with carbon dioxide boiling heat transfer coefficient. The heat transfer coefficient values were calculated employing different existing methods. A comparison between experimental and calculated heat transfer coefficient values is also shown.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2015, 6; 358--359
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of heat transfer and pressure drop during flow boiling and flow condensation in minichannels
    Autorzy:
    Mikielewicz, D.
    Andrzejczyk, R.
    Jakubowska, B.
    Mikielewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/240815.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-phase pressure drops
    heat transfer coefficient
    boiling
    condensation
    dwufazowy spadek ciśnienia
    współczynnik przenikania ciepła
    wrzenie
    kondensacja
    Opis:
    In the paper a method developed earlier by authors is applied to calculations of pressure drop and heat transfer coefficient for flow boiling and also flow condensation for some recent data collected from literature for such fluids as R404a, R600a, R290, R32,R134a, R1234yf and other. The modification of interface shear stresses between flow boiling and flow condensation in annular flow structure are considered through incorporation of the so called blowing parameter. The shear stress between vapor phase and liquid phase is generally a function of nonisothermal effects. The mechanism of modification of shear stresses at the vapor-liquid interface has been presented in detail. In case of annular flow it contributes to thickening and thinning of the liquid film, which corresponds to condensation and boiling respectively. There is also a different influence of heat flux on the modification of shear stress in the bubbly flow structure, where it affects bubble nucleation. In that case the effect of applied heat flux is considered. As a result a modified form of the two-phase flow multiplier is obtained, in which the nonadiabatic effect is clearly pronounced.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 3; 17-37
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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