Temat: marine film - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Kinetics of marine surfactant adsorption at an air-water interface. Baltic Sea studies
Autorzy:: Pogorzelski, S.J.
Kogut, A.D.
Powiązania:: https://bibliotekanauki.pl/articles/48394.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: coastal water
water interface
surface adsorption
marine film
kinetics
Baltic Sea
adsorption barrier
adsorption
Opis:: The paper contains the results of studies of natural surface film adsorption kinetics carried out in inland waters and in shallow offshore regions of the Baltic Sea during 2000–01 under calm sea conditions. The novel approach presented here for the adsorption dynamics is based on the mixed kinetic-diffusion model and analyses of the surface pressure-time plots at short (t → 0) and long (t→∞) adsorption time intervals. Values of the effective relative diffusion coefficient Deff/D (= 0.008 − 0.607) and energy barrier for adsorption Ea/RT (= 0.49 − 7.10) agree well with the data reported for model non-ionic surfactant solutions of pre-cmc concentrations. Wind speed is one of the factors affecting the adsorption barrier via the increased surface pressure of the natural film exposed to wind shear stress (∼ U10 2),a nd enters the relation Ea/RT = 1.70U10 1/3.
Źródło:: Oceanologia; 2001, 43, 4
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Static and dynamic properties of surfactant films on natural waters
Autorzy:: Pogorzelski, S.J.
Kogut, A.D.
Powiązania:: https://bibliotekanauki.pl/articles/49159.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:: natural water
Mediterranean Sea
dynamic property
water condition
surfactant
marine film
Baltic Sea
viscoelasticity
static property
Opis:: The paper contains the results of natural surface film surface pressure – area experiments carried out in inland waters and shallow offshore regions of the Baltic and Mediterranean Seas during 1990–99 under calm water conditions using the Langmuir trough – Wilhelmy filter paper plate system, which ‘cuts out’ an undisturbed film-covered sea area without any initial physico-chemical sample processing. The limiting specific area Alim (268–3157 ˚A2/molecule−1) and mean molecular mass (0.65–9.7 kDa) of microlayer surfactants were determined from the 2D virial equation of state applied to the isotherms. Film structure signatures were derived from π − A isotherm hysteresis and application of the 2D polymer scaling theory. The stress-relaxation measurements revealed a two-step relaxation process at the interface with characteristic times τ1 (1.1–2.8) and τ2 (5.6–25.6) seconds suggesting the presence of diffusion-controlled and structural organization relaxation phenomena. The results demonstrate that natural films are a complex mixture of biomolecules covering a wide range of solubilities, surface activity and molecular mass with an apparent structural organization exhibiting a spatial and temporal variability.
Źródło:: Oceanologia; 2001, 43, 2
0078-3234
Pojawia się w:: Oceanologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Assessment of possibilities of testing the high power engine piston ring-cylinder liner collaboration on a model test stand
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/243866.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine engine
piston ring
oil film
Opis:: The design of piston rings for modern engines of low and medium power guarantees long reliable operation, thanks to proper selection of materials, suitable geometry of mating surfaces as well as the use of lubricating oils of appropriate quality. At present, the efforts of constructors focus on other aspects of operation of this kinematic pair. The aim is to reduce costs of engine run as well as improvement of ecologic indices (eg. by the reduction in lube oil consumption, reduction of friction losses through the reduction in ring number, and so on). There still occur failures caused by incorrect collaboration of piston rings and cylinder liners on engines of high output, especially the marine ones. Higher mechanical and thermal loads of crank mechanism elements as well as difficulties with supply and correct distribution of lubricating oil over the liner entire surface are among the causes of these phenomena. Because of limited measurement possibilities the research on correct collaboration of piston ring and cylinder liner could be quite difficult and expensive on a real marine engine. Such research could be carried out far easier on a model simulation test rig. The presented paper will deal with the question if the test rig purposed for the investigation of kinematic pair collaboration - property of the Combustion Engine Chair - is suitable for evaluation of collaboration of marine engine piston ring with cylinder liner in the presence of lubricating oil.
Źródło:: Journal of KONES; 2008, 15, 2; 441-448
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Model investigation of piston ring-cylinder liner collaboration on a high power engine
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/245364.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine combustion engine
piston ring
oil film
model test
Opis:: Failures caused by improper collaboration between piston ring and cylinder liner still happen on engines ofhigh output, marine ones in particular. Among causes of this phenomenon one can mention higher mechanical and thermal loads of crank mechanism as well as difficulties in supply and distribution of lubricating oil over the entire surface of cylinder liner. It would be extremely difficult and because of regulations in most cases impossible to perform tests on correct collaboration between rings and liner of real running engine and on the other hand such tests on a test stand would be quite expensive. Use of mathematical models and tests on simulation model stands offers a way to reduce these costs. Basic dependences connecting piston ring geometry with oil film parameters and introductory results of computations performed with the use of analytical model of test stand will be presented in this paper. The tests are to be carried out for ring geometry corresponding to that of marine engine rings. Due to that, using presented earlier formulas and computer program constructed by the authors the phenomena accompanying operation of different versions of rings were analyzed from the point of oil film thickness and generated friction losses. These ring versions which revealed the most advantageous properties will be made and tested on a test stand.
Źródło:: Journal of KONES; 2009, 16, 4; 407-413
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Compression rings of low-speed high power engines
Autorzy:: Serdecki, W.
Krzymień, P.
Powiązania:: https://bibliotekanauki.pl/articles/247699.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: marine combustion engine
piston ring
compression ring
oil film
Opis:: The paper describes the design of compression rings used in low-speed, high power marine engines and it analyses relations between the most important operational parameters. Ring material, dimensions, geometry of sliding surfaces, distribution of circumferential pressure as well as operational conditions (thermal and mechanical loads, way of lubrication) were taken into consideration for the analysis mentioned above. Moreover, the paper points at modifications in ring geometry that have been happening for last years, comparing previous and recent designs. The effect of ring circumferential pressure against liner on the piston-cylinder assembly operation has been considered and the causes of its variability have been pointed out as well. When presenting the methods of measurement and tangential force calculations basic advantages and disadvantages have been presented as well as the evaluation of changes resulting from the ring circumferential wear. The compression ring mathematical model developed by the authors allows for a precise definition of relations between ring geometry and distribution of ring circumferential pressure. A need for a more accurate method of ring circumferential pressure evaluation has been justified in summary, giving hints necessaryfor its preparation.
Źródło:: Journal of KONES; 2010, 17, 4; 415-422
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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