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Wyszukujesz frazę "pool" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
The effect of pressure on heat transfer during pool boiling of water-A1[2]0[3] and water-Cu nanofluids on stainless steel smooth tube
Autorzy:
Cieślinski, J.T.
Kaczmarczyk, T.Z.
Powiązania:
https://bibliotekanauki.pl/articles/185613.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanofluid
ciśnienie robocze
pool boiling
operating pressure
Opis:
Experimental investigation of heat transfer during pool boiling of two nanofluids, i.e. water-Al203 and water-Cu has been carried out. Nanoparticles were tested at the concentration of 0.01%, 0.1%, and 1% by weight. The horizontal smooth stainless steel tubes having 10 mm OD and 0.6 mm wall thickness formed the test heater. The experiments have been performed to establish the influence of nanofluids concentration on heat transfer characteristics during boiling at different absolute operating pressure values, i.e. 200 kPa, ca. 100 kPa (atmospheric pressure) and 10 kPa. It was established that independent of nanoparticle materials (A1203 and Cu) and their concentration, an increase of operating pressure enhances heat transfer. Generally, independent of operating pressure, sub- and atmospheric pressure, and overpressure, an increase of nanoparticle concentration caused heat transfer augmentation.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 321-332
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of pool nucleate boiling in nanofluid with lattice Boltzmann method
Autorzy:
Rostamzadeh, A.
Jafarpur, K.
Rad, E. G.
Powiązania:
https://bibliotekanauki.pl/articles/949317.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
pool boiling
nanofluid
lattice Boltzmann method
heat transfer
Opis:
Due to significant improvement of thermal performance and other properties of nanofluids, this group of liquids is in high demand. According to the literature, the effect of nanoparticles on boiling heat transfer enhancement or degradation is not the same among different investigations. In the present article, the pseudo-potential multiphase lattice Boltzmann method is used to simulate nucleate pool boiling with two different fluids: a pure liquid and a nanofluid. The current results indicate that the contact angle is the same for both the fluid and nanofluid when the vapor bubble detachment occurs. Also, bubble departure diameter is greater in the base liquid while bubble release frequency is higher in the nanofluid. In brief, the present results demonstrate that using a nanofluid instead of its base fluid will increase the boiling heat transfer coefficient.
Źródło:
Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 811-825
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of heat transfer during pool boiling on minifins surface coated with carbon nanotubes
Autorzy:
Strąk, E.
Pastuszko, R.
Kłosowiak, R.
Urbaniak, R.
Powiązania:
https://bibliotekanauki.pl/articles/175588.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pool boiling
carbon nanotube
heat transfer coefficient
power
electronic cooling
Opis:
The article describes the study of heat transfer during pool boiling on minifins surface coated with nanostructure. This is a molecular level technology used in engineering or mechanical factory. A surface with carbon nanotubes (CNTs) is highly effective in reducing the superheat incipience and enhancing both the heat flux and heat transfer coefficient. The paper focuses on the comparison of the surfaces, on which pool boiling heat transfer occurs, i.e., on minifins coated with carbon nanotubes (MF+N) with surfaces formed by sintering the woven copper wire mesh to the minifins tips (MF+M) and with plain minifins surface (MF). The experiments were carried out for two boiling fluids: water and ethyl alcohol. The purpose of the presented study was to find out which of those tested surfaces and fluids could be the best alternative for use in the cooling of electronic devices and which surfaces could be used as thermosyphon or heat pipe evaporator.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 128; 59-72
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of the pool boiling heat transfer coefficient using the gas injection into the water
Autorzy:
Sarafraz, M.M.
Peyghambarzadeh, S.M.
Alavi Fazel, S.A.
Powiązania:
https://bibliotekanauki.pl/articles/778947.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
heat transfer
pool boiling
Gas-liquid solution
Nucleation site density
SO2
water
Opis:
In this paper, a new method for enhancing the pool boiling heat transfer coefficient of pure liquid, based on the gas injection through the liquids has been introduced. Hence, the effect of gas dissolved in a stagnant liquid on pool boiling heat transfer coefficient, nucleation site density, and bubble departure diameter has experimentally been investigated for different mole fractions of SO2 and various heat fluxes up to 114 kW/ m2. The presence of SO2 in captured vapor inside the bubbles, particularly around the heat transfer surface increases the pool boiling heat transfer coefficient. The available predicted correlations are unable to obtain the reasonable values for pool boiling heat transfer coefficient in this particular case. Therefore, to predict the pool boiling heat transfer coefficient accurately, a new modified correlation based on Stephan-Körner relation has been proposed. Also, during the experiments, it is found that nucleation site density is a strictly exponential function of heat flux. Accordingly, a new correlation has been obtained to predict the nucleation site density. The major application of the nucleation site density is in the estimating of mean bubble diameters as well as local agitation due to the rate of bubble frequency.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 4; 100-109
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fenomenologiczna ocena tworzenia się struktur wodno-olejowych podczas wrzenia w objętości
Phenomenological assessment of water-oil patterns formed during pool boiling
Autorzy:
Troniewski, L.
Filipczak, G.
Witczak, S.
Powiązania:
https://bibliotekanauki.pl/articles/2070619.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wrzenie w objętości
struktury wrzenia
wnikanie ciepła
pool boiling
boiling patterns
heat transfer
Opis:
W pracy przedstawiono wyniki badań i analiz dotyczących warunków wnikania ciepła podczas wrzenia mieszaniny cieczy wzajemnie nierozpuszczalnych. Eksperymenty przeprowadzono w dużej objętości i pod ciśnieniem atmosferycznym, wykorzystując jako czynniki robocze wodę oraz oleje o różnych właściwościach. Scharakteryzowano warunki wnikania ciepła przy różnej zawartości obu składników mieszaniny.
Experimental results of heat transfer during pool boiling of two immiscible liquids are presented. The experiments were carried out under atmospheric pressure. Water and various oil mixtures were used as working liquids. The conditions of heat transfer for a different content of both liquids in the mixture were characterized.
Źródło:
Inżynieria i Aparatura Chemiczna; 2009, 6; 188-189
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pool boiling of nanofluids on rough and porous coated tubes: experimental and correlation
Autorzy:
Cieśliński, J. T.
Kaczmarczyk, T. Z.
Powiązania:
https://bibliotekanauki.pl/articles/240179.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pool boiling
nanofluids
correlation equation
rough and porous coated tubes
wrzenie w objętości
nanopłyny
równanie korelacyjne
rury z powłoką porowatą
Opis:
The paper deals with pool boiling of water-Al2O3 and water-Cu nanofluids on rough and porous coated horizontal tubes. Commercially available stainless steel tubes having 10 mm outside diameter and 0.6 mm wall thickness were used to fabricate the test heater. The tube surface was roughed with emery paper 360 or polished with abrasive compound. Aluminium porous coatings of 0.15 mm thick with porosity of about 40% were produced by plasma spraying. The experiments were conducted under different absolute operating pressures, i.e., 200, 100, and 10 kPa. Nanoparticles were tested at the concentration of 0.01, 0.1, and 1% by weight. Ultrasonic vibration was used in order to stabilize the dispersion of the nanoparticles. It was observed that independent of operating pressure and roughness of the stainless steel tubes addition of even small amount of nanoparticles augments heat transfer in comparison to boiling of distilled water. Contrary to rough tubes boiling heat transfer coefficient of tested nanofluids on porous coated tubes was lower compared to that for distilled water while boiling on porous coated tubes. A correlation equation for prediction of the average heat transfer coefficient during boiling of nanofluids on smooth, rough and porous coated tubes is proposed. The correlation includes all tested variables in dimensionless form and is valid for low heat flux, i.e., below 100 kW/m2.
Źródło:
Archives of Thermodynamics; 2014, 35, 2; 3-20
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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