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Wyszukujesz frazę "Cieślinski, J.T." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Effect of nanofluid concentration on two-phase thermosyphon heat exchanger performance
    Autorzy:
    Cieśliński, J. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240904.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-phase thermosyphon
    heat exchanger
    nanofluid
    Wilson method
    termosyfon dwufazowy
    wymiennik ciepła
    metoda Wilsona
    Opis:
    An approach – relaying on application of nanofluid as a working fluid, to improve performance of the two-phase thermosyphon heat exchanger (TPTHEx) has been proposed. The prototype heat exchanger consists of two horizontal cylindrical vessels connected by two risers and a downcomer. Tube bundles placed in the lower and upper cylinders work as an evaporator and a condenser, respectively. Distilled water and nanofluid water-Al2O3 solution were used as working fluids. Nanoparticles were tested at the concentration of 0.01% and 0.1% by weight. A modified Peclet equation and Wilson method were used to estimate the overall heat transfer coefficient of the tested TPTHEx. The obtained results indicate better performance of the TPTHEx with nanofluids as working fluid compared to distilled water, independent of nanoparticle concentration tested. However, increase in nanoparticle concentration results in overall heat transfer coefficient decrease of the TPTHEx examined. It has been observed that, independent of nanoparticle concentration tested, decrease in operating pressure results in evaporation heat transfer coefficient increase.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 2; 23-40
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Thermal energy storage using stearic acid as PCM material
    Autorzy:
    Cieśliński, J. T.
    Fabrykiewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/95177.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    PCM
    phase change materials
    stearic acid
    helical coil
    thermal energy storage
    materiał zmiennofazowy
    kwas stearynowy
    cewka spiralna
    magazynowanie energii cieplnej
    Opis:
    This work presents an experimental study of thermal energy storage by the use of PCM. The aim of the study was to establish the influence of the different inlet temperature of heat transfer fluid (HTF) and the different Reynolds number of HTF on the intensity of the charging and discharging processes. The PCM used in this study was stearic acid and water was used as HTF. A copper helical coil mounted in a cylindrical container served as a heat transfer surface.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2018, 2, 3; 217-223
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania przejmowania ciepła podczas wrzenia na pęku rur ogrzewanych elektrycznie
    Investigation of boiling heat transfer in an electrically heated tube bundle
    Autorzy:
    Krasowski, K.
    Cieśliński, J. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/396908.pdf
    Data publikacji:
    2010
    Wydawca:
    ENERGA
    Tematy:
    wymiana ciepła
    badania eksperymentalne
    heat transfer
    experimental test
    Opis:
    The paper presents the results of experimental research on water, methanol and R141b refrigerant boiling in a horizontal bundle of smooth tubes supposed to represent part of a flooded evaporator. Experiments were carried out for a bundle of 19 tubes in triangular layout for two spacing-to-diameter ratio values -1.7 and 2.0 - in atmospheric and subatmospheric pressure conditions. Heat transfer coefficient values - both local, tube-specific, and general, for the entire bundle - were determined. The boiling process at the bundle was visualized with a CCD camera and laser sheet technique. A correlation equation allowing the calculation of the average heat transfer coefficient for boiling in smooth tube bundles has been proposed.
    Źródło:
    Acta Energetica; 2010, 3; 31-40
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    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
    Tytuł:
    Measurement of temperature-dependent viscosity and thermal conductivity of alumina and titania thermal oil nanofluids
    Autorzy:
    Cieśliński, J. T.
    Ronewicz, K.
    Smoleń, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/240372.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluids
    dynamic viscosity
    thermal conductivity
    electrical conductivity
    nanopłyny
    lepkość dynamiczna
    przewodnictwo cieplne
    przewodnictwo elektryczne
    Opis:
    In this study the results of simultaneous measurements of dynamic viscosity, thermal conductivity, electrical conductivity and pH of two nanofluids, i.e., thermal oil/Al2O3 and thermal oil/TiO2 are presented. Thermal oil is selected as a base liquid because of possible application in ORC systems as an intermediate heating agent. Nanoparticles were tested at the concentration of 0.1%, 1%, and 5% by weight within temperature range from 20°C to 60°C. Measurement devices were carefully calibrated by comparison obtained results for pure base liquid (thermal oil) with manufacturer’s data. The results obtained for tested nanofluids were compared with predictions made by use of existing models for liquid/solid particles mixtures.
    Źródło:
    Archives of Thermodynamics; 2015, 36, 4; 35-47
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic characteristics of the proton exchange membrane fuel cell module
    Autorzy:
    Cieśliński, J. T.
    Kaczmarczyk, T. Z.
    Dawidowicz, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/240068.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PEM fuel cell
    hydrogen
    dynamic characteristics
    ogniwo paliwowe PEM
    wodór
    charakterystyka dynamiczna
    Opis:
    The paper describes a fuel cell based system and its performance. The system is based on two fuel cell units, DC/DC converter, DC/AC inverter, microprocessor control unit, load unit, bottled hydrogen supply system and a set of measurement instruments. In the study presented in the paper a dynamic response of the proton exchange membrane (PEM) fuel cell system to unit step change load as well as to periodical load changing cycles in the form of semi-sinusoidal and trapezoidal signals was investigated. The load was provided with the aid of an in-house-developed electronic load unit, which was fully PC controlled. The apparatus was commissioned by testing the steady-state operation of the module. The obtained efficiency of the fuel cell shows that the test apparatus used in the study provides data in substantial agreement with the manufacturer’s data.
    Źródło:
    Archives of Thermodynamics; 2018, 39, 4; 125--140
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat transfer in plate heat exchanger channels: Experimental validation of selected correlation equations
    Autorzy:
    Cieśliński, J. T.
    Fiuk, A.
    Typiński, K.
    Siemieńczuk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/240555.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PHEx
    Wilson method
    correlations
    metoda Wilsona
    korelacje
    Opis:
    This study is focused on experimental investigation of selected type of brazed plate heat exchanger (PHEx). The Wilson plot approach was applied in order to estimate heat transfer coefficients for the PHEx passages. The main aim of the paper was to experimentally check ability of several correlations published in the literature to predict heat transfer coefficients by comparison experimentally obtained data with appropriate predictions. The results obtained revealed that Hausen and Dittus-Boelter correlations underestimated heat transfer coefficient for the tested PHEx by an order of magnitude. The Aspen Plate code overestimated heat transfer coefficient by about 50%, while Muley-Manglik correlation overestimated it from 1% to 25%, dependent on the value of Reynolds number and hot or cold liquid side.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 3; 19-29
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the possibilities of using of DME fuel in motor boat drive systems
    Autorzy:
    Kropiwnicki, J.
    Dominiczak, P.
    Kneba, Z.
    Makowski, S.
    Cieśliński, J. T.
    Ziółkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/133565.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    internal combustion engines
    dimethyl ether
    DME
    alternative fuel
    emission reduction
    fuel storage on board small vessels
    silnik spalinowy
    eter dimetylowy
    paliwo alternatywne
    redukcja emisji
    przechowywanie paliwa
    Opis:
    The characteristics of alternative fuel for diesel: dimethyl ether (DME) and an analysis of the potential to reduce emissions of toxic compounds by the engines when running on this fuel have been presented in this work. Basic types of design solutions of gas supply and control systems, possible for use in internal combustion engines with DME supply have been also presented. The paper presents a study of the legislation and an analysis of the feasibility of the system storage and fueling DME on board small vessels.
    Źródło:
    Combustion Engines; 2017, 56, 4; 74-80
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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