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    Wyświetlanie 1-7 z 7
    Tytuł:
    Influence of surface curvature on sessile droplet contact angle of nanofuids
    Autorzy:
    Cieśliński, J. T.
    Krygier, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/175339.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contact angle
    nanofluids
    substrate curvature
    Opis:
    This paper deals with the change in contact angle of droplets for three nanofluids, i.e., water- Al2O3, water-TiO2 and water-Cu. Nanoparticles were tested at the concentration of 0.01, 0.1, and 1% by weight. Although dispersants were not used to stabilize the suspension, the solutions tested exhibited satisfactory stability. Ultrasonic vibration was used in order to stabilise the dispersion of the nanoparticles. Experimental measurements were performed for horizontal stainless steel (316) tube of three diameters, i.e., 1.6, 3 and 5 mm, and flat stainless steel plates. The results obtained show that the contact angle of tested nanofluids depends strongly on nanoparticle concentration as well as the curvature of the substrate.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2013, 125; 3-12
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do combinations of insecticides and acaricides influence spray droplet formation and the interaction with citrus leaves?
    Autorzy:
    Della Vechia, J.F.
    Santos, R.T.
    Griesang, F.
    Santos, C.M.
    Ferriera, M.C.
    Andrade, D.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084816.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contact angle
    coverage efficiency
    droplet size
    surface tension
    tank mixture
    Opis:
    In agriculture, the mixing of pesticides in tanks is a common practice. However, it is necessary to previse possible physical-chemical implications of this practice, which may affect the efficiency of the treatments performed. Therefore, the objective of this study was to evaluate the effects of the addition of acaricide to insecticidal spray mixtures on the formation of spray droplets and the interaction with citrus leaves. The experimental design was totally randomized, in a (2 × 3 + 1) factorial scheme for seven treatments. Factor A corresponded to the spray mixture used (isolate or in the mixture). Factor B corresponded to the insecticides tested (lambda-cyhalothrin + thiamethoxam, phosmet, and imidacloprid) and the control consisted of a spray mixture with spirodiclofen only. Nine replications were performed for characterization of the spray droplet size spectrum and four replications for the analysis of the surface tension and the contact angle. The mixture of pesticides showed positive results in terms of application safety. The addition of acaricide to insecticide spray mixtures reduced the surface tension and contact angle of droplets on the adaxial surface of orange leaves. There was an increment in volume median diameter (VMD), a significant reduction in the volume of droplets with drift-sensitive size and improvement in the uniformity of droplet size. Therefore, the addition of acaricide to an insecticide spray mixture positively influenced spray droplet formation and the interaction with citrus leaves providing better coverage and droplet size fractions with an appropriate size for safe and efficient application.
    Źródło:
    Journal of Plant Protection Research; 2019, 59, 4; 487-493
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of chemical structure of foundry binder diluent on surface processes and sand strength
    Wpływ chemicznej struktury rozcieńczalnika w spoiwie na przebieg procesów powierzchniowych i na wytrzymałość masy
    Autorzy:
    Hutera, B.
    Drożyński, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/354126.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamika zwilżania
    rozcieńczalnik
    wytrzymałość masy
    dynamic contact angle
    diluent
    moulding sands
    Opis:
    The paper presents the results of investigations of the dynamics of wetting in a quartz-binder system. It has been proved that the two-stage process of wetting (unsteady state passing into the steady state) is important for the practice of moulding sands and depends on physico-chemical parameters of binder, especially on its viscosity. A mathematical description of the wetting phenomena was given and it was demonstrated that the course of the wetting dynamics is determined by the viscosity which depends on the chemical structure and concentration of added diluent. The wetting dynamics is characterised by the difference ?? between the values of the initial ?0 and equilibrium ?r contact angle and by the time ?r that the system needs to reach a steady state. It has been shown that the dynamics of quartz wetting by the binder with diluent of a chain structure and high concentration is higher with simultaneous reducing of time ?r. It has been verified that the resistance of moulding sands with binder and the diluent of chain structure and high concentration is higher compared to the strength of the sands with diluent of another structure.
    W pracy przedstawiono wyniki badań dynamiki zwilżania w układzie: kwarc-spoiwo. Wykazano, że dwuetapowy proces zwilżania (stan niestacjonarny przechodzący w stan stacjonarny) ma znaczenie dla praktyki mas i uwarunkowany jest parametrami fizykochemicznymi spoiwa a zwłaszcza jego lepkością. Przedstawiono matematyczny opis zjawiska zwilżania oraz wykazano, że na przebieg dynamiki zwilżania ma lepkość uwarunkowana chemiczną strukturą i stężeniem wprowadzonego rozcieńczalnika. Dynamikę zwilżania charakteryzuje różnica ?? pomiędzy wartościami początkowego ?0 i równowagowego ?r kąta zwilżania oraz czas ?r dojścia układu do stanu stacjonarnego. Wykazano, że dynamika zwilżania kwarcu przez spoiwa z rozcieńczalnikiem o strukturze łańcuchowej i wysokim stężeniu jest wyższa przy równoczesnym skróceniu czasu ?r. Zweryfikowano, że wytrzymałość mas ze spoiwem z rozcieńczalnikiem o strukturze łańcuchowej i wysokim stężeniu jest wyższa w porównaniu z wytrzymałością mas z rozcieńczalnikiem o innej strukturze.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 1; 31-36
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure characteristics and strength model of composite rock samples in contact zone under compression
    Autorzy:
    Wang, Qihu
    Wang, Jie
    Ye, Yicheng
    Jiang, Wei
    Yao, Nan
    Powiązania:
    https://bibliotekanauki.pl/articles/219633.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    materiał kompozytowy
    kąt zwilżania
    awaria
    contact zone
    composite rock sample
    contact angle
    failure characteristics
    constraint stress
    strength model
    Opis:
    Significant differences in the physical and mechanical properties exist between the rock masses on two sides of an ore-rock contact zone, which the production tunnels of an underground mine must pass through. Compared with a single rock mass, the mechanical behavior of the contact zone composite rock comprising two types of rock is more complex. In order to predict the overall strength of the composite rock with different contact angles, iron ore-marble composite rock sample uniaxial compression tests were conducted. The results showed that composite rock samples with different contact angles failed in two different modes under compression. The strengths of the composite rock samples were lower than those of both the pure iron ore samples and pure marble samples, and were also related to the contact angle. According to the stress-strain relationship of the contact surface in the composite rock sample, there were constraint stresses on the contact surface between the two types of rock medium in the composite rock samples. This stress state could reveal the effect of the constraint stress in the composite rock samples with different contact angles on their strengths. Based on the Mohr-Coulomb criterion, a strength model of the composite rock considering the constraint stress on the contact surface was constructed, which could provide a theoretical basis for stability researches and designs of contact zone tunnels.
    Źródło:
    Archives of Mining Sciences; 2020, 65, 2; 347-361
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relative wettability measurement of porous diffuser and its impact on the generated bubble size
    Autorzy:
    Al-Yaqoobi, Atheer M.G.
    Zimmerman, William B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173415.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kąt kontaktu
    dyfuzor porowaty
    metoda Washburn
    zwilżalność
    bubble size
    contact angle
    porous diffuser
    Washburn method
    wettability
    Opis:
    Controlling the bubble size is a major concern in enhancing transport performance in gas-liquid systems. The role of wettability of diffuser surface on bubble size is the subject of the current work. The study inspects the contact angle of a set of liquids on HP ceramic diffusers using the Washburn method. The results demonstrate that organic liquids like toluene, methanol–water (1:1 v/v), ethanol– water (1:1 v/v) and decane have small contact angles of 12.9, 37.5, 24.4 and 22.5 respectively. Water has a lower wettability than the organic compounds where the contact angle was about 67.4. The effect of wettability of the bubble size is investigated by measuring the size of air bubble produced using the same diffuser material. The results of bubble size measurement demonstrates that with liquids of small contact angle, i.e. good wetting properties, small bubble sizes are produced in comparison with liquids with a higher contact angle. The study demonstrates the viability of Washburn method in characterization of wettability of porous diffuser, which was verified by measuring the bubble size produced. A high reduction in bubble size can be obtained by a carefully chosen diffuser material that provides better wettability.
    Źródło:
    Chemical and Process Engineering; 2022, 43, 1; 45--55
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wettability and Surface Free Energy of Ti(C,N) Coatings on Nickel-based Casting Prosthetic Alloys
    Autorzy:
    Banaszek, K.
    Klimek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/381148.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dental alloy
    wettability
    contact angle
    surface tension
    surface free energy
    stop dentystyczny
    zwilżalność
    kąt zwilżania
    napięcie powierzchniowe
    energia powierzchniowa swobodna
    Opis:
    The production process of prosthetic restorations runs in two stages. In the first stage, the prosthetic foundation is produced of metal alloys. In the second stage, a facing material is applied on the produced element. In both stages, the wettability is significantly important, as well as the free surface energy relating to it. The quality of the obtained cast depends on the surface phenomena occurring between the metal alloy and the material of which the casting mould is made. The performed examinations also point to a relation between the ceramics joint and the base, depending on the wetting angle. The aim of the presented paper was to examine influence of the composition of a Ti(C,N)-type coating on bases made of the Ni-Cr prosthetic alloy on the wettability and the surface free energy. The test material were disks made of the Ni-Cr alloy with the diameter of 8 mm. The disks were divided into five groups, which were covered with Ti(C,N) coatings, with different amounts of C and N in the layer. In order to determine the surface free energy (γs), the wetting angle was measured. Two measure liquids were applied: distilled water and diiodomethane. The obtained results of the measurements of the water-wetting angles suggest that together with the increase of the ratio of nitrogen to carbon in the Ti(C,N) coating, the surface hydrophobicity increases as well. In all the samples, one can see a large difference between the energy values of the polar and the apolar components. The high values of the polar components and the low values of the apolar ones make it possible to conclude that these surfaces exhibit a greater affinity to the polar groups than to the apolar ones. On the basis of the analysis of the surface free energy, one can state that covering the alloy with Ti(C,N)-type coatings should not decrease the adhesion of the ceramics to the alloy, whereas TiC coatings should lead to the latter’s improvement. Due to their hydrophilicity, TiC coatings should decrease the adhesion of bacteria to the surface and hinder the formation of a bacterial biofilm.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 11-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Tension of Cu – Bi Alloys And Wettability in a Liquid Alloy – Refractory Material – Gaseous Phase System
    Napięcie powierzchniowe stopów Cu – Bi oraz zwilżalność w układzie: ciekły stop – materiał ogniotrwały – faza gazowa
    Autorzy:
    Oleksiak, B.
    Łabaj, J.
    Wieczorek, J.
    Blacha-Grzechnik, A.
    Burdzik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/354400.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface tension
    contact angle
    wettability
    sessile drop method
    high-temperature microscope
    liquid Cu-Bi alloys
    napięcie powierzchniowe
    zwilżalność
    metoda kropli leżącej
    mikroskop wysokotemperaturowy
    ciekłe stopy Cu-Bi
    Opis:
    The study involved measurements of surface tension of liquid binary copper-bismuth alloys with respect to their chemical composition and temperature as well as investigations of the liquid alloy - refractory material - gaseous phase system wettability using usual refractory materials, i.e. aluminium oxide, magnesium oxide and graphite. The experiments were performed with the use of sessile drop method and a high-temperature microscope coupled with a camera and a computer was utilised.
    W ramach pracy przeprowadzone zostały pomiary napięcia powierzchniowego ciekłych dwuskładnikowych stopów miedzi z bizmutem, w funkcji składu chemicznego i temperatury oraz badania zwilżalności w układzie: ciekły stop- materiał ogniotrwały-faza gazowa z wykorzystaniem typowych materiałów ogniotrwałych, to jest tlenku glinu, tlenku magnezu oraz grafitu. Badania wykonano metodą kropli leżącej, przy użyciu mikroskopu wysokotemperaturowego sprzężonego z kamerą i komputerem.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 281-285
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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