Temat: spadek ciśnienia - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modeling of pressure drop during refrigerant condensation in pipe minichannels
Autorzy:: Sikora, M.
Bohdal, T.
Powiązania:: https://bibliotekanauki.pl/articles/240860.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: minichannels
pressure drop
refrigerant
condensation
minikanał
spadek ciśnienia
chłodziwo
kondensacja
Opis:: Investigations of refrigerant condensation in pipe minichannels are very challenging and complicated issue. Due to the multitude of influences very important is mathematical and computer modeling. Its allows for performing calculations for many different refrigerants under different ﬂow conditions. A large number of experimental results published in the literature allows for experimental verification of correctness of the models. In this work is presented a mathematical model for calculation of ﬂow resistance during condensation of refrigerants in the pipe minichannel. The model was developed in environment based on conservation equations. The results of calculations were verified by authors own experimental investigations results.
Źródło:: Archives of Thermodynamics; 2017, 38, 4; 15--28
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Bubble boiling in flow of refrigerating media
Autorzy:: Bohdal, T.
Powiązania:: https://bibliotekanauki.pl/articles/95227.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: bubble boiling
heat transfer
pressure drop
tubular channel
wrzenie pęcherzykowe
wymiana ciepła
spadek ciśnienia
kanał rurowy
Opis:: The paper describes results of investigations of heat transfer and pressure drop during bubbly boiling of refrigerating media. In this article were presented of authors own experimental studies and were proposed new simple calculation model describing bubble boiling in the tubular channel. The author attempts to put forward a simplified description of the process of bubble boiling in a straight pipe. The two-phase one-component (liquid-vapour) system is treated as a continuum governed by the laws of conservation of energy, momentum and mass. The continuum is characterised by parameters that describe the two-phase system, such as density of the two-phase mixture, static void fraction or static equilibrium dryness fraction. In view of engineering applications, a one-dimensional model is used where physical quantities are cross-section averaged. This way the average velocity, pressure, temperature, and so on, are introduced. The results of the proposed model have been compared with the results of the experimental research with satisfactory compliance.
Źródło:: Journal of Mechanical and Energy Engineering; 2017, 1, 1; 57-64
2544-0780
2544-1671
Pojawia się w:: Journal of Mechanical and Energy Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Pressure drop during condensation of refrigerants in pipe minichannels
Autorzy:: Bohdal, T.
Charun, H.
Sikora, M.
Powiązania:: https://bibliotekanauki.pl/articles/240165.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: kompaktowy kondensator
przepływ
skraplanie
skraplaniea w minikanałach
spadek ciśnienia
compact condenser
condensation in minichannels
pressure drop during flow in condensation
Opis:: The present paper describes results of experimental investigations of pressure drop during the condensation of R134a, R404a and R407C refrigerants in pipe minichannels with internal diameter 0.31-3.30 mm. The results concern investigations of the mean and local pressure drop in single minichannels. The results of experimental investigations were compared with the calculations according to the correlations proposed by other authors. A pressure drop during the condensation of refrigerants is described in a satisfactory manner with Friedel and Garimella correlations. On the basis of the experimental investigations, the authors proposed their own correlation for calculation of local pressure drop during condensation in single minichannels.
Źródło:: Archives of Thermodynamics; 2012, 33, 1; 87-106
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: An investigation of heat transfer coefficient during refrigerants condensation in vertical pipe microchannel
Autorzy:: Bohdal, T.
Kruzel, M.
Sikora, M.
Powiązania:: https://bibliotekanauki.pl/articles/95255.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: heat transfer coefficient
pressure drop
heat flux density
microchannel
vapor quality
współczynnik przenikania ciepła
spadek ciśnienia
gęstość strumienia ciepła
mikrokanał
stopień suchości
Opis:: This article presents the results of experimental research of R404A, R407C and R410A high-pressure refrigerants condensation in vertical pipe microchannels with an internal diameter dw below 1 mm. The study determined the local and average heat transfer coefficient in the full range of vapor quality, x = 1-0. On the basis of experimental investigations, the dependence of heat transfer coefficient on the vapor quality x, the mass flux density G and the channel internal diameter dw was obtained.
Źródło:: Journal of Mechanical and Energy Engineering; 2017, 1, 2; 163-169
2544-0780
2544-1671
Pojawia się w:: Journal of Mechanical and Energy Engineering
Dostawca treści:: Biblioteka Nauki

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