Temat: pressure factor - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental and numerical study of the heat transfer and pressure drop in triangular chevron channels
Autorzy:: Dolatabadi, H.
Aghdam, A. H.
Powiązania:: https://bibliotekanauki.pl/articles/949298.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: heat transfer
pressure drop
thermal enhancement factor
phase shift
Opis:: Experimental and Numerical studies were carried out on turbulent heat transfer and friction factor loss through a triangular chevron channel. For uniform wall heat flux equal 1350 (W/m²) using air as a working fluid. Reynolds number varied from 3000 to 10000, phase shifted at the range of 0≤ϕ≤180, with variation distance between chevron surfaces (5 ≤ D ≤ 35 mm). Nu increased and TEF decreased in increasing of Re. The TEF and Nu increased with closing to channel phase shift angle 90˚, the best performance was noticed on phase shift, ϕ=90º. At the end of this paper effect of distance between chevron surfaces presented, The TEF and Nu increased with decreasing to channel distance and the best performance was noticed on closing to D=5(mm).
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 751-763
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Pomiary oporów przepływu jednofazowego w minikanałach
Measurements of single phase pressure drop in minichannels
Autorzy:: Dutkowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/156887.pdf
Data publikacji:: 2010
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: minikanały
opory przepływu
współczynnik tarcia
badania eksperymentalne
minichannels
pressure drop
friction factor
experimental investigations
Opis:: W artykule przedstawiono wyniki badań dotyczących oporów jednofazowego przepływu wody (Re = 6 414) oraz powietrza (Re = 22 865) minikanałami. Jako minikanały zastosowano rurki ze stali nierdzewnej o całkowitej długości 500 mm i 15 różnych średnicach wewnętrznych (0,21 - 2,30 mm). Wyznaczono współczynnik strat liniowych podczas ruchu laminarnego, burzliwego i granicę przejścia z zakresu laminarnego w burzliwy. Wyniki badań porównano z wielkościami teoretycznymi znanymi z mechaniki płynów kanałów konwencjonalnych.
The paper presents results of experimental investigations of pressure drop in minichannels, with use of water and air as the working fluids. The test section was made from stainless steel pipes of internal diameters equal to 0.21, 0.31, 0.45, 0.55, 0.64, 0.80, 1.05, 1.10, 1.30, 1.35, 1.40, 1.60, 1.68, 1.94 and 2.30 mm. The experiments were conducted for the Reynolds number up to Re = 6 414 and Re = 22 865 for water and air, respectively. A friction factor is presented as a function of the Reynolds number. The experimental friction factor is compared with the results obtained from theoretical equations of Hagen-Poiseuille and Blasius. There was determined the boundary of transition to the turbulent flow. The deviation of all the results of experimental investigations was not greater than š 20% related to the friction factor coefficient theoretical value. On the basis of the experimental investigations performed, one can state that: - contradictory reports concerning a sooner transition to the turbulent flow different from those occurring in conventional channels were not confirmed; - the friction factor of laminar flow can be correctly predicted by the conventional correlation λ=64/Re; - the friction factor of turbulent flow can be correctly predicted by Blasius correlation, which is valid for conventional channels; - the theory of single-phase flow in conventional channels was found to produce valid predictions for experimental results.
Źródło:: Pomiary Automatyka Kontrola; 2010, R. 56, nr 5, 5; 503-506
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Cooling of High Heat Flux Flat Surface with Nanofluid Assisted Convective Loop. Experimental Assessment
Autorzy:: Arya, A.
Shahmiry, S.
Nikkhah, V.
Sarafraz, M.M.
Powiązania:: https://bibliotekanauki.pl/articles/139852.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ZnO nanoparticle
pressure drop
heat transfer coefficient
friction factor
nanocząstki ZnO
spadek ciśnienia
współczynnik przenikania ciepła
współczynnik tarcia
Opis:: Experimental investigation was conducted on the thermal performance and pressure drop of a convective cooling loop working with ZnO aqueous nanofluids. The loop was used to cool a flat heater connected to an AC autotransformer. Influence of different operating parameters, such as fluid flow rate and mass concentration of nanofluid on surface temperature of heater, pressure drop, friction factor and overall heat transfer coefficient was investigated and briefly discussed. Results of this study showed that, despite a penalty for pressure drop, ZnO/water nanofluid was a promising coolant for cooling the micro-electronic devices and chipsets. It was also found that there is an optimum for concentration of nanofluid so that the heat transfer coefficient is maximum, which was wt. % = 0.3 for ZnO/water used in this research. In addition, presence of nanoparticles enhanced the friction factor and pressure drop as well; however, it is not very significant in comparison with those of registered for the base fluid.
Źródło:: Archive of Mechanical Engineering; 2017, LXIV, 4; 519-531
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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