Wyznaczanie współczynnika przejmowania ciepła podczas wrzenia w przepływie dwutlenku węgla

• Autorzy: Mikielewicz D. , Jakubowska B.

Warianty tytułu

EN

Prediction of flow boiling heat transfer coefficient for carbon dioxide in minichannels

• Języki publikacji: PL

Abstrakty

PL

W pracy przedstawiono wyniki obliczeń uzyskane za pomocą własnego modelu półempirycznego dla wybranych danych eksperymentalnych dla wrzenia w przepływie dwutlenku węgla. Metoda obliczeniowa została zweryfikowana z danymi eksperymentalnymi Docoulombiera i innych (2011) oraz Mastrullo i innych (2009). Badania eksperymentalne dotyczą pełnego zakresu zmienności stopnia suchości oraz zakresu prędkości masowej G=2001200 kg/m2s. Rozwijany od lat w Katedrze Energetyki i Aparatury Przemysłowej Politechniki Gdańskiej model wrzenia w przepływie wykorzystuje do modelowania wymiany ciepła wyrażenie opisujące opory przepływu dwufazowego. W przedstawionych w pracy obliczeniach wykorzystano do tego celu dwa modele tj. Müllera-Steinhagena i Hecka oraz Friedela. W pracy pokazano również wpływ napięcia powierzchniowego na obliczenia oporów przepływu i wymiany ciepła oraz modyfikację naprężeń stycznych na granicy rozdziału faz.

EN

In the paper presented is the analysis of the results of calculations using a model to predict flow boiling of carbon dioxide. The model was verified with the experimental data due to Docoulombier et al. (2011) and Mastrullo et al. (2009). The experimental research was conducted for a full range of quality variation and a relatively wide range of mass velocity. The aim of present study was to test the sensitivity of development model of two-phase flow multiplier and the nonadiabatic effects. For that purpose two models have been analyzed namely due to Müller-Steinhagen and Heck correlation, Friedel correlation and introducing into the model the so called blowing parameter. Furthermore, in the paper shows the behavior of the heat transfer coefficient, when effect of bubbles generation is omitted and when the impact of flow resistance is omitted. In addition, the work shows the importance of taking into account in the calculation of the structure surface tension.

Słowa kluczowe

PL

współczynnik przejmowania ciepła; wrzenie; przepływ dwutlenku węgla

EN

heat transfer coefficient; flow boiling; carbon dioxide

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Chłodnictwo : organ Naczelnej Organizacji Technicznej
• Rocznik: 2015
• Tom: R. 50, nr 1-2
• Strony: 28--34
• Opis fizyczny: Bibliogr. 34 poz., rys., tab.

Twórcy

autor

Mikielewicz D.

• Politechnika Gdańska, Wydział Mechaniczny, Katedra Energetyki i Aparatury Przemysłowej

autor

Jakubowska B.

• Politechnika Gdańska, Wydział Mechaniczny, Katedra Energetyki i Aparatury Przemysłowej

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