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Journal of Theoretical and Applied Mechanics
PL Termodynamiczny model ośrodka porowatego nasyconego cieczą. Zaproponowano prosty model termodynamicznego ośrodka porowatego nasyconego cieczą. Dla opisu izotropowej struktury porów stałego szkieletu nasyconego cieczą zostały wprowadzone dwie skalarne zmienne stanu: objętościowa porowatość... i param[...]
EN In order to describe isotropic pore structure of a solid skeleton satureted with a fluid, two internal state variables are introduced: a volume porosity... and a structural parameter... . The internal friction in the skeleton material is incorporated by a tensor-valued internal state variable... . T[...]
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Archivum Combustionis
2010 Vol. 30 nr 3 275-284
EN The variety of biomass fuels and their constantly increasing content in the coal/biomass co-combustion requires further and more sophisticated on-line diagnostic methods, which can help in the properties characterization and fuels selection in terms of the impact on slagging and fouling of the heat [...]
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Zeszyty Naukowe. Mechanika / Politechnika Opolska
4
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Chłodnictwo : organ Naczelnej Organizacji Technicznej
PL Przedstawiono propozycję matematycznego opisu krytycznego strumienia ciepła w niskotemperaturowym termosyfonie. Za podstawę przyjęto analizę kondensacji pary czynnika ziębniczego powracającego do sekcji parowacza termosyfonu. Jako wyjściowe kryterium do zamodelowania i oceny procesu transportu ciepł[...]
EN A mathematical model of the critical heat flux in the low temperature heat pipe had been presented. This model bases on the analysis of refrigerant's condensation on the vertical wall of the heat pipe. The first criterion for the model was interfacial shear stress.
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Measurement Automation Monitoring
2017 Vol. 63, No. 3 119--121
EN Contemporary transport of perishable food and other cargoes sensitive for temperature changes is carried out basing on specialist isothermal and cooling bodies. The reason of the deterioration of the body insulation condition is the penetration of water into the heat/cold protecting material and the[...]
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Archives of Metallurgy and Materials
2016 Vol. 61, iss. 4 2021--2026
EN In this study, a method of determining the heat flux, which reaches the surface of a charge, has been presented with the use of an inverse analysis. The research on the heating process of a square 15HM steel charge was conducted in a natural gas-fired laboratory furnace. The inverse solution was bas[...]
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Inżynieria i Aparatura Chemiczna
2004 Nr 3s 143-145
EN The results of poligon experiments with crude oil tank fires are presented in the paper. The analysis of obtained results allows us to explain the temperature stratification and heat wave performance that are the main parameters determining the boil-over phenomenon. The possibilities of estimation o[...]
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Archivum Combustionis
EN The aim of the furnace chamber calculation is to determine the heat flux distribution transferred to water-walls tubes versus a furnace chamber height and the exhaust gas temperature at the furnace chamber outlet. In this paper a new construction of heat flux tubes for determining heat flux absorbed[...]
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AGH Drilling, Oil, Gas
2017 Vol. 34, no. 4 843--853
EN Use of low-temperature energy accumulated in the ground for heating buildings requires the borehole heat exchangers. The amount of heat exchanged (by the heat exchanger with the urethane) depends on the construction material parameters used to make the exchanger. One of the problems with the efficie[...]
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Journal of Theoretical and Applied Mechanics
2014 Vol. 52 nr 3 617--628
EN Two upper collinear cracks are placed parallel to a lower crack in an infinite orthotropic plane under uniform heat flux perpendicular to the cracks. The surfaces of the cracks are assumed to be thermally insulated. The mixed boundary value conditions with respect to the temperature field and those [...]
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Journal of KONES
EN Measurements were made during downward propagation of a flat flame in a lean limit methane/air mixture. It was observed that the limit flames are very thick and that heat losses to the walls caused extensive cooling of the product gases within 0.05 m behind the propagating flame. Analysis of all dat[...]
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Optica Applicata
EN Nitride laser diodes (LDs), as compared with arsenide ones, are known to exhibit poor thermal properties, mostly because of a very intense heat generation within their volumes. Therefore, to enable their useful operation, they should be designed in a way enhancing efficiency of heat-flux extraction [...]
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Archives of Metallurgy and Materials
2017 Vol. 62, iss. 4 2193--2198
EN This paper deals with influencing the crystallisation of Al alloys by a direct squeeze casting method. The effects of changed cooling rates of the casting is evaluated using a heat transfer coefficient at different casting conditions. The experimental results obtained by temperature measurement of t[...]
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Technical Sciences / University of Warmia and Mazury in Olsztyn
2019 nr 22(1) 45--59
EN The present paper discusses steady MHD second order slip flow and heat transfer for a slightly rarefied gas due to an impermeable stretching sheet with heat flux and internal heat generation. By using the Lie group analysis, new similarity transformations are obtained. Employing these transformation[...]
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Journal of Theoretical and Applied Mechanics
2018 Vol. 56 nr 1 147--156
EN The technique of integral Hankel transform to find the solution of heat conduction in half-space coated by a multilayered package of homogenous laminae is applied. The half-space is heated by the given heat flux on the boundary surface. The temperature and heat flux distribution in the radial direct[...]
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Journal of Theoretical and Applied Mechanics
2019 Vol. 57 nr 2 461--473
EN A mathematical model to analyse the influence of change of the friction power over time on temperature of a pad-disc tribosystem has been proposed. For this purpose, a boundary- -value problem of heat conduction for two semi-infinite bodies with taking into account heat generation due to friction on[...]
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Systems : journal of transdisciplinary systems science
EN The variety of biomass fuels and their constantly increasing content in the coal/biomass co-combustion requires further and more sophisticated on-line diagnostic methods, which can help in the fuels properties characterization and selection in terms of slagging and fouling problems of the heat excha[...]
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Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
2001 z. 17 65-70
PL W pracy przedstawiono rezultaty wielowariantowych obliczeń numerycznych zrealizowanych dla poziomego, gruntowego wymiennika ciepła zespołu pompy grzejnej. Celem obliczeń było wyznaczenie rozkładów temperatury w powtarzalnym fragmencie gruntu w sąsiedztwie rury, a następnie jednostkowych strumieni ci[...]
EN In the paper the results of multivariant numerical calculations for horizontal underground heat exchanger of heat pump system are presented. Determination of temperature distributions in the repetitive fragment of the domain neighbouring pipe, as well as heat flux densities transferred from the grou[...]
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Rynek Energii
2010 nr 1 108-114
PL W pracy przedstawiono uproszczoną metodę wyznaczania gęstości strumienia ciepła przejmowanego przez powierzchnię ogrzewalną parownika kotła energetycznego. Omówiona została konstrukcja wstawki termometrycznej służącej do pomiaru gęstości strumienia ciepła. Gęstość strumienia ciepła przejmowanego prz[...]
EN This paper presents a method, which allows determining of the heat flux in combustion chambers of power steam boilers. The design of a thermometric insert used for measuring the heat flux has been described. The heat flux absorbed by the water-walls of the boiler has been determined on the basis of [...]
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Zeszyty Naukowe Politechniki Świętokrzyskiej. Nauki Techniczne
2007 Z. 4 134-137
PL W celu zmniejszenia zużycia na powierzchniach roboczych układów hamulcowych nanoszone są warstwy ochronne. Powstające w nich podczas tarcia wysokie gradienty temperaturowe, a w następstwie wysokie naprężenia termiczne, powodują w pewnych warunkach inicjację mikroszczelin, co może przyczynić się do n[...]
EN We analyse the distribution of thermal stresses of a piecewise homogeneous body formed by a homogeneous matrix and a layer which is heated up on a free surface by a frictional thermal flow. We find normal stresses induced by the temperature field in the layer according to the formulas of temperature[...]
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