Temat: przenikanie ciepła - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigations on heat and momentum transfer in CuO-water nanofluid
Autorzy:: Dzido, G.
Drzazga, M.
Lemanowicz, M.
Gierczycki, A. T.
Powiązania:: https://bibliotekanauki.pl/articles/240561.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nanofluids
fluid mechanics
heat transfer
nanopłyny
mechanika płynów
przenikanie ciepła
Opis:: This paper presents results of investigations on the application of CuO-water nanofluids for intensification of convective heat transfer. Performance of nanofluids with 2.2 and 4.0 vol.% CuO NPs (nanoparticles) content were examined with regard to heat transfer coefficient and pressure losses in case of turbulent flow in a tube. Negligible impact of examined nanofluid on heat transfer improvement was found. Moreover, measured pressure losses significantly exceeded those determined for primary base liquid. The observations showed that application of nanofluid for heat transfer intensification with a relatively high solid load in the examined flow range is rather controversial.
Źródło:: Archives of Thermodynamics; 2015, 36, 2; 49-59
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Numerical analysis of the steam flow field in shell and tube heat exchanger
Autorzy:: Bartoszewicz, J.
Bogusławski, L.
Powiązania:: https://bibliotekanauki.pl/articles/240429.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: heat transfer
heat exchanger
shell and tube heat exchanger
przenikanie ciepła
wymiennik ciepła
wymiennik płaszczowo-rurowy
Opis:: In the paper, the results of numerical simulations of the steam flow in a shell and tube heat exchanger are presented. The efficiency of different models of turbulence was tested. In numerical calculations the following turbulence models were used: k-ε, RNG k-ε, Wilcox k-ω, Chen-Kim k-ε, and Lam-Bremhorst k-ε. Numerical analysis of the steam flow was carried out assuming that the flow at the inlet section of the heat exchanger were divided into three parts. The angle of steam flow at inlet section was determined individually in order to obtain the best configuration of entry vanes and hence improve the heat exchanger construction. Results of numerical studies were verified experimentally for a real heat exchanger. The modification of the inlet flow direction according to theoretical considerations causes the increase of thermal power of a heat exchanger of about 14%.
Źródło:: Archives of Thermodynamics; 2016, 37, 2; 107-120
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Experimental determination of correlations for mean heat transfer coefficients in plate fin and tube heat exchangers
Autorzy:: Taler, D.
Powiązania:: https://bibliotekanauki.pl/articles/239992.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: model matematyczny
przenikanie ciepła
wymiennik ciepła
heat transfer correlations
mathematical model
tube and plate fin heat exchangers
Opis:: This paper presents a numerical method for determining heat transfer coefficients in cross-flow heat exchangers with extended heat exchange surfaces. Coefficients in the correlations defining heat transfer on the liquid- and air-side were determined using a nonlinear regression method. Correlation coefficients were determined from the condition that the sum of squared liquid and air temperature differences at the heat exchanger outlet, obtained by measurements and those calculated, achieved minimum. Minimum of the sum of the squares was found using the Levenberg-Marquardt method. The uncertainty in estimated parameters was determined using the error propagation rule by Gauss. The outlet temperature of the liquid and air leaving the heat exchanger was calculated using the analytical model of the heat exchanger.
Źródło:: Archives of Thermodynamics; 2012, 33, 3; 3-26
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

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