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    Wyświetlanie 1-11 z 11
    Tytuł:
    Unsteady natural convection in micropolar nanofluids
    Autorzy:
    Rup, K.
    Nering, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/240090.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    micropolar fluid
    nanofluid
    heat transfer enhancement
    płyn mikropolarny
    nanopłyn
    intensyfikacja wymiany ciepła
    Opis:
    This paper presents the analysis of momentum, angular momentum and heat transfer during unsteady natural convection in micropolar nanofluids. Selected nanofluids treated as single phase fluids contain small particles with diameter size 10-38.4 nm. In particular three water-based nanofluids were analyzed. Volume fraction of these solutions was 6%. The first of the analyzed nanofluids contained TiO2 nanoparticles, the second one contained Al2O3 nanoparticles, and the third one the Cu nanoparticles.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 3; 155-170
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the absorbing pervaporation technique for ammonia recovery after the haber process
    Autorzy:
    Atlaskin, A.
    Petukhov, A. N.
    Yanbikov, N. R.
    Salnikova, M.E.
    Sergeeva, M. S.
    Vorotyntsev, V. M.
    Vorotyntsev, I. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/184857.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas separation
    absorbing pervaporation
    ammonia
    process intensification
    membrane
    separacja gazów
    amoniak
    intensyfikacja procesu
    membrana
    Opis:
    A novel absorbing pervaporation hybrid technique has been evaluated experimentally for the recovery of ammonia from the gas mixture in a recycle loop of synthesis plants. This process of hybridization brings together the combination of energy-efficient membrane gas separation based on poly(dimethylsiloxane) poly(diphenylsilsesquioxane) with a high selective sorption technique where a water solution with polyethylene glycol 400 (PEG-400) was used as the liquid absorbent. Process efficiency was studied using the pure and mixed gases. The influence of PEG-400 content in aqueous solutions on process selectivity and separation efficiency was studied. The ammonia recovery efficiency evaluation of an absorbing pervaporation technique was performed and compared with the conventional membrane gas separation. It was shown that the absorbing pervaporation technique outperforms the conventional membrane method in the whole range of productivity, producing the ammonia with a purity of 99.93 vol.% using the PEG 80 wt.% solution. The proposed method may be considered as an attractive solution in the optimization of the Haber process.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 3; 323--333
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Review on hierarchically microstructured monolithic reactors for high yield continuous production of fine chemicals
    Autorzy:
    Mrowiec-Białoń, J.
    Ciemięga, A.
    Maresz, K.
    Szymańska, K.
    Pudło, W.
    Jarzębski, A. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/184990.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microreactors
    in-flow synthesis
    process intensification
    nanostructured materials
    mikroreaktory
    synteza wewnątrzpłynna
    intensyfikacja procesu
    materiały nanostrukturalne
    Opis:
    Preparation and properties of hierarchically structured porous silica monoliths have been discussed from the viewpoint of their application as continuous microreactors for liquid-phase synthesis of fine chemical in multi kilogram scales. The results of recent topical papers published by two research teams of Institute of Chemical Engineering Polish Academy of Sciences (ICE) and Department of Chemical Engineering and Process Design, Chemical Faculty, Silesian University of Technology (SUT) have been analyzed to specify the governing traits of microreactors. It was concluded that even enhancement factor of 100 in activity, seen in enzyme catalyzed reactions, can be explained by a proportional reduction of its physical constraints, i.e. huge enhancement of external mass transfer and micromixing. It is induced by very chaotic flows of liquid in tens of thousands of waving connected channels of ca. 25–50 mm in diameter, present in the skeleton. The scale of enhancement in the caseof less active catalysts was smaller, but still large enough to consider the most practical applications.
    Źródło:
    Chemical and Process Engineering; 2018, 39, 4; 367--375
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condensation enhancement by means of electrohydrodynamic techniques
    Autorzy:
    Butrymowicz, D.
    Karwacki, J.
    Trela, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/239917.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    condensation
    electrohydrodynamic technique
    heat transfer enhancement
    enhanced tubes
    kondensacja
    elektrohydrodynamika
    technika
    intensyfikacja wymiany ciepła
    rura
    wzmocnienie
    Opis:
    Short state-of-the-art on the enhancement of condensation heat transfer techniques by means of condensate drainage is presented in this paper. The electrohydrodynamic (EHD) technique is suitable for dielectric media used in refrigeration, organic Rankine cycles and heat pump devices. The electric field is commonly generated in the case of horizontal tubes by means of a rod-type electrode or mesh electrodes. Authors proposed two geometries in the presented own experimental investigations. The first one was an electrode placed just beneath the tube bottom and the second one consisted of a horizontal finned tube with a double electrode placed beneath the tube. The experimental investigations of these two configurations for condensation of refrigerant R-123 have been accomplished. The obtained results confirmed that the application of the EHD technique for the investigated tube and electrode arrangement caused significant increase in heat transfer coefficient. The condensation enhancement depends both on the geometry of the electrode system and on the applied voltage.
    Źródło:
    Archives of Thermodynamics; 2014, 35, 4; 3-27
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational Fluid Dynamics and Experimental Studies of a New Mixing Element in a Static Mixer as a Heat Exchanger
    Autorzy:
    Konopacki, M.
    Kordas, M.
    Fijałkowski, K.
    Rakoczy, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/185462.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixing
    heat transfer process
    static mixer
    CFD
    process intensification
    mieszanie
    proces przenikania ciepła
    mieszalnik statyczny
    intensyfikacja
    Opis:
    The main aim of this work is to study the thermal efficiency of a new type of a static mixer and to analyse the flow and temperature patterns and heat transfer efficiency. The measurements were carried out for the static mixer equipped with a new mixing insert. The heat transfer enhancement was determined by measuring the temperature profiles on each side of the heating pipe as well as the temperature field inside the static mixer. All experiments were carried out with varying operating parameters for four liquids: water, glycerol, transformer oil and an aqueous solution of molasses. Numerical CFD simulations were carried out using the two-equation turbulence k-ω model, provided by ANSYS Workbench 14.5 software. The proposed CFD model was validated by comparing the predicted numerical results against experimental thermal database obtained from the investigations. Local and global convective heat transfer coefficients and Nusselt numbers were detrmined. The relationship between heat transfer process and hydrodynamics in the static mixer was also presented. Moreover, a comparison of the thermal performance between the tested static mixer and a conventional empty tube was carried out. The relative enhancement of heat transfer was characterised by the rate of relative heat transfer intensification.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 1; 59-72
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Steam Reforming Catalyst Geometry on the Performance of Tubular Reformer – Simulation Calculations
    Autorzy:
    Franczyk, E.
    Gołębiowski, A.
    Borowiecki, T.
    Kowalik, P.
    Wróbel, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/184862.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tubular steam reforming
    nickel catalyst geometry
    process simulation
    catalyst coking
    process intensification
    symulacja procesu
    katalizator koksujący
    intensyfikacja
    Opis:
    A proper selection of steam reforming catalyst geometry has a direct effect on the efficiency and economy of hydrogen production from natural gas and is a very important technological and engineering issue in terms of process optimisation. This paper determines the influence of widely used seven-hole grain diameter (ranging from 11 to 21 mm), h/d (height/diameter) ratio of catalyst grain and Sh/St (hole surface/total cylinder surface in cross-section) ratio (ranging from 0.13 to 0.37) on the gas load of catalyst bed, gas flow resistance, maximum wall temperature and the risk of catalyst coking. Calculations were based on the one-dimensional pseudo-homogeneous model of a steam reforming tubular reactor, with catalyst parameters derived from our investigations. The process analysis shows that it is advantageous, along the whole reformer tube length, to apply catalyst forms of h/d = 1 ratio, relatively large dimensions, possibly high bed porosity and Sh/St ≈ 0.30-0.37 ratio. It enables a considerable process intensification and the processing of more natural gas at the same flow resistance, despite lower bed activity, without catalyst coking risk. Alternatively, plant pressure drop can be reduced maintaining the same gas load, which translates directly into diminishing the operating costs as a result of lowering power consumption for gas compression.
    Źródło:
    Chemical and Process Engineering; 2015, 36, 2; 239-250
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vapordynamic thermosyphon – heat transfer two-phase device for wide applications
    Autorzy:
    Vasiliev, L.
    Zhuravlyov, A.
    Shapovalov, A.
    Rodin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240265.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermosyphon
    vapordynamic thermosyphon
    long horizontal condenser
    porous coating
    heat transfer intensification
    termosyfon
    powłoka porowata
    intensyfikacja wymiany ciepła
    Opis:
    Vapordynamic thermosyphon (VDT) is an efficient heat transfer device. The two-phase flow generation and dynamic interaction between the liquid slugs and vapor bubbles in the annular minichannel of the VDT condenser are the main features of such thermosyphon, which allowed to increase its thermodynamic efficiency. VDT can transfer heat in horizontal position over a long distance. The condenser is nearly isothermal with the length of tens of meters. The VDT evaporators may have different forms. Some practical applications of VDT are considered.
    Źródło:
    Archives of Thermodynamics; 2015, 36, 4; 65-76
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance analyses of helical coil heat exchangers. The effect of external coil surface modification on heat exchanger effectiveness
    Autorzy:
    Andrzejczyk, R.
    Muszyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240706.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    effectiveness
    heat transfer intensification
    number of transfer unit
    helical coil
    skuteczność
    intensyfikacja wymiany ciepła
    liczba jednostek przesyłowych
    spirala
    Opis:
    The shell and coil heat exchangers are commonly used in heating, ventilation, nuclear industry, process plant, heat recovery and air conditioning systems. This type of recuperators benefits from simple construction, the low value of pressure drops and high heat transfer. In helical coil, centrifugal force is acting on the moving fluid due to the curvature of the tube results in the development. It has been long recognized that the heat transfer in the helical tube is much better than in the straight ones because of the occurrence of secondary flow in planes normal to the main flow nside the helical structure. Helical tubes show good performance in heat transfer enhancement, while the uniform curvature of spiral structure is inconvenient in pipe installation in heat exchangers. Authors have presented their own construction of shell and tube heat exchanger with intensified heat transfer. The purpose of this article is to assess the influence of the surface modification over the performance coefficient and effectiveness. The experiments have been performed for the steady-state heat transfer. Experimental data points were gathered for both laminar and turbulent flow, both for co current- and countercurrent flow arrangement. To find optimal heat transfer intensification on the shell-side authors applied the number of transfer units analysis.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 4; 137-159
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of thermal performance factor for solar air heaters with artificially roughened channels
    Autorzy:
    Siddique, Waseem
    Raheem, Aneeq
    Aqeel, Muhammad
    Qayyum, Sualeh
    Salamen, Tareq
    Waheed, Khalid
    Qureshi, Kamran
    Powiązania:
    https://bibliotekanauki.pl/articles/1845043.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    turbulence promoter
    solar air heater
    heat transfer enhancement
    thermal performance factor
    słoneczny grzejnik powietrzny
    intensyfikacja wymiany ciepła
    współczynnik wydajności cieplnej
    Opis:
    Heat transfer augmentation has become the utmost industrial desire. Turbulence promoters seems to be a better option for better heat transfer but at the expense of enormous pressure drop. In the current study, experimental optimization of heat transfer and pressure drop in various configurations of ribbed and corrugated surfaces on the bottom wall of the Solar Air Heater channel, having aspect ratio of 26:5 was performed. The results were evaluated in terms of enhancement in heat transfer (Nu/Nu s), friction factor ratio (f/f s) and thermal performance factor ( η). Three different cases and nine configurations with a pitch to rib/corrugation height ratio of 4.0 were studied. Case A consists of a smooth, continuous square rib, inline and staggered broken ribs. Case B comprises 30°, 45°, 60° and 90° trapezoidal corrugated geometries while Case C is the comparison of smooth, wavy corrugated and the best configurations of cases A and B. The results show that rectangular duct with staggered broken ribs and trapezoidal corrugation at 45° are the best configurations for case A and B, respectively. The 45° corrugated configuration is the best one amongst all, with values of 1.53, 1.5 and 1.33% for Nu/Nu s, f/f s and η respectively.
    Źródło:
    Archive of Mechanical Engineering; 2021, LXVIII, 2; 195-225
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric study of fluid flow and heat transfer over louvered fins of air heat pump evaporator
    Autorzy:
    Muszyński, T.
    Kozieł, S. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240658.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat exchangers
    heat transfer intensification
    CFD
    convection
    air source heat pump
    wymienniki ciepła
    intensyfikacja wymiany ciepła
    konwekcja
    powietrzne pompy ciepła
    Opis:
    Two-dimensional numerical investigations of the fluid flow and heat transfer have been carried out for the laminar flow of the louvered fin-plate heat exchanger, designed to work as an air-source heat pump evaporator. The transferred heat and the pressure drop predicted by simulation have been compared with the corresponding experimental data taken from the literature. Two dimensional analyses of the louvered fins with varying geometry have been conducted. Simulations have been performed for different geometries with varying louver pitch, louver angle and different louver blade number. Constant inlet air temperature and varying velocity ranging from 2 to 8 m/s was assumed in the numerical experiments. The air-side performance is evaluated by calculating the temperature and the pressure drop ratio. Efficiency curves are obtained that can be used to select optimum louver geometry for the selected inlet parameters. A total of 363 different cases of various fin geometry for 7 different air velocities were investigated. The maximum heat transfer improvement interpreted in terms of the maximum efficiency has been obtained for the louver angle of 16° and the louver pitch of 1.35 mm. The presented results indicate that varying louver geometry might be a convenient way of enhancing performance of heat exchangers.
    Źródło:
    Archives of Thermodynamics; 2016, 37, 3; 45-62
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Membrane gas separation module with pulsed retentate for low-permeable component recovery
    Autorzy:
    Battalov, Stanislav V.
    Trubyanov, Maxim M.
    Puzanov, Egor S.
    Sazanova, Tatyana S.
    Drozdov, Pavel N
    Vorotyntsev, Ilya V.
    Powiązania:
    https://bibliotekanauki.pl/articles/185429.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    membrane gas separation
    unsteady-state operation
    process intensification
    separation
    efficiency
    membrane module
    separacja gazów membranowych
    operacja niestabilna
    intensyfikacja procesu
    separacja
    wydajność
    moduł membranowy
    Opis:
    The paper presents the experimentalstudy of a novel unsteady-statemembrane gas separation approachfor recovery of a slow-permeant component in the membrane module with periodical retentate with-drawals. The case study consisted in the separation of binary test mixtures based on the fast-permeantmain component (N2O, C2H2) and the slow-permeant impurity (1% vol. of N2)using a radial counter-current membrane module. The novel semi-batch withdrawal technique was shown to intensify theseparation process and provide up to 40% increase in separation efficiency compared to a steady-stateoperation of the same productivity.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 1; 57--65
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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