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Wyświetlanie 1-15 z 81
Tytuł:
Determination of Heat of Biomass Pyrolysis and Particle Residence Time under Isothermal and Non-Isothermal Heating Conditions
Autorzy:
Sobamowo, M. G.
Ojolo, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/1031615.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Biomass particle
Heat of Pyrolysis
Isothermal temperature
Non- Isothermal heating
Opis:
The experimental investigations for determination of heat of pyrolysis have given quite different results due to the influence of the experimental conditions on the measured heat of pyrolysis of biomass. Consequently, a theoretical investigation into the process is required. Therefore, this paper presents analytical model for the determination of heat of biomass pyrolysis and particle residence time under isothermal and non-isothermal heating conditions. The developed analytical solutions are used to investigate the effects of heating conditions on the heat of biomass pyrolysis and particle residence time. From study, it is established that the heat of the pyrolysis first showed endothermic peaks and followed by exothermic peaks at different temperatures for the different heating rates. Also, as the heating rate increases, the particle residence time in the reactor decreases and high heating rates favoured the production of tar and gas. The length of heating and its intensity affect the rate, extent and sequence of pyrolysis reactions, and composition of the resultant products.
Źródło:
World Scientific News; 2020, 146; 60-71
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Degradation Behavior of Ag Nanowire-Coated Transparent Conductive Film
Autorzy:
Kim, Jae-Yeon
Kim, Hye-Young
Kim, Hyun-Su
Yoo, Ki-Tae
Yang, Won-Jon
Byeon, Jai-Won
Powiązania:
https://bibliotekanauki.pl/articles/354224.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silver nanowire
isothermal degradation
electrical resistance
overcoating
Opis:
For the reliable applications of silver nanowires, AgNW, which is used as a conductive transparent film in electronic devices, the isothermal degradation behaviors of AgNW films with and without overcoating were investigated. Accelerated isothermal degradation was performed as a function of temperature, time, and atmosphere. Electrical resistance and optical transmittance were measured and correlated with the microstructural damages, such as formation of oxide particles and fragmentations of AgNW, which were quantitatively determined from the scanning electron micrographs. The overcoating retarded the formation of oxide particles and subsequent fragmentations as well as resulting degradation in electrical resistance without affecting the optical transmittance.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 913-916
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Improved Approximation for DIPPR-Based Predicting Speed of Sound in Long-Chained n-Alkanes
Autorzy:
Postnikov, E. B.
Nedyalkov, Y. V.
Polishuk, I.
Powiązania:
https://bibliotekanauki.pl/articles/177788.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
n-alkanes
isothermal compressibility
speed of sound
Opis:
In this short communication, we revise a correlation for the saturated liquid isothermal compressibility based on the data available in DIPPR (Postnikov, 2016) which considers the molecular non-sphericity and addresses a problem of predicting speeds of sound in saturated long-chained alkanes. In addition, we correct a misprint appeared in the cited work and provide programming code used for the realisation of the proposed calculations.
Źródło:
Archives of Acoustics; 2018, 43, 3; 537-541
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Research of Temperature Distribution on the Surface of the Front Plate, of a Flat Plate Heat Exchanger
Badania eksperymentalne rozkładu temperatury na powierzchni płyty czołowej płaskiego, płytowego wymiennika ciepła
Autorzy:
Orłowska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1811588.pdf
Data publikacji:
2020
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
radiator
temperature
convection
isothermal
grzejnik
temperatura
konwekcja
izotermiczność
Opis:
The purpose of the work was to perform experimental tests on a plate heat exchanger. For this purpose, a laboratory test stand located in the hall of the Koszalin University of Technology was used. The experiment concerned checking the isothermal face of a flat panel radiator. Temperature distributions were checked at three board heights and in twelve finite elements. Temperature distribution fields were obtained depending on the flow rates tested.
Celem pracy było wykonanie badań eksperymentalnych na płytowym wymienniku ciepła. W tym celu wykorzystano laboratoryjne stanowisko badawcze zlokalizowane w sali Politechniki Koszalińskiej. Eksperyment dotyczył sprawdzenia izotermicznej powierzchni płaskiego grzejnika płytowego. Rozkłady temperatury sprawdzono na trzech wysokościach płyty i w dwunastu elementach skończonych. W zależności od badanych natężeń przepływu uzyskano pola rozkładu temperatury.
Źródło:
Rocznik Ochrona Środowiska; 2020, Tom 22, cz. 1; 256-264
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of Heat Damage Losses of Cooling Bodies
Autorzy:
Rochatka, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/114545.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
isothermal and refrigerating bodies
heat bridge
heat losses
Opis:
This paper presents the calculation results of heat amount increase being typical for isothermal and cooling bodies where body plating has been broken causing the open way for water penetration into the insulating material and thus deteriorating the insulating properties of the damaged body fragment. During the service of the isothermal and cooling bodies the damages of their different fragments take place. A typical damage is abrasion of the side walls, damage to the joints of walls and walls with the roof and damage to the door edges. Using the thermovision camera and the algorithm described in [1], heat loss can be calculated for a fragment of the body that includes damage - an operational heat bridge that generates a variable heat flux being difficult or even impossible to be measured with heat flux density sensors. On the example of typical damages occurring in the serviced refrigerated body, they have calculated the amount of additional heat which may lead to the disqualification of the refrigeration body from refrigerated transport of sensitive goods, such as food and medical goods, bringing losses to transport companies.
Źródło:
Measurement Automation Monitoring; 2019, 65, 2; 52-54
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Boltzmann simulation of natural convection flow around a horizontal cylinder located beneath an insulation plate
Autorzy:
Mehrizi, A. A.
Farhadi, M.
Afrouzi, H. H.
Shayamehr, S.
Lotfizadeh, H.
Powiązania:
https://bibliotekanauki.pl/articles/949135.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
free convection
isothermal cylinder
Lattice Boltzmann method (LBM)
Opis:
In this paper, two-dimensional heat transfer solution of natural convection around an isothermal cylinder located beneath an insulation wall is studied. The effects of distance ratio of the cylinder to the wall as well as the impact of the dimensionless Rayleigh number in the flow and heat transfer are taken into account. Solving the flow equations for L/D ratio with values 0.5, 0.7, and 1.5 and the Rayleigh number ranging from 1000 to 40000 is carried out. The results are compared with the experimental data which present a good agreement. The results indicate that the effect of weakened natural convection flow in the cylinder commences when decreasing L/D ratio from the value 1.5 to 0.5 leading to a decline in heat transfer and the Nusselt number. This process occurs in all values of the Rayleigh number. For the ratio number greater than 1.5, the impact of adiabatic wall is neglected, and there is no significant influence on the natural convection flow. Increasing the angle from 0◦to180◦results in a fall in the Nusselt number which is as a consequence of growth in the distances of isothermal lines.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 729-739
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the Possibilities of Using Forging Heat in Isothermal Annealing Processes for AISI 4140 Alloy
Autorzy:
Zwierzchowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/352575.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
AISI 4140 steel
isothermal annealing
forging
thermal treatment
Opis:
Production processes of hot forging most often look similar [1-3]. Forging in several operations, usually in three or four. Most often the first operation is upsetting or flattening (sometimes rolling). The last operation is finishing forging. This applies to the production of steel forgings for the automotive, agricultural and other similar industries. Typical production proceeds as follows: the forgings are cleaned (shot-blasted) and then heat treatment is performed. It can be normalization, hardening and tempering, etc. After the heat treatment, forgings are checked and subjected to strength and microscopic tests, hardness tests, impact tests. The type of tests depends on the recipient. The process described in the work takes place in three operations. The heat treatment used so far is hardening and tempering. An attempt was made to change the heat treatment technology for a selected product made of 42CrMo4 steel (1.7225) (4140). An isothermal annealing test was carried out at different temperatures and for different times. The possibility of using heat from the forging process in heat treatment processes for the described product has been confirmed.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 951-958
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-isothermal Studies on the Thermal Decomposition of C4 Explosive Using the TG/DTA Technique
Autorzy:
Pouretedal, H. R.
Damiri, S.
Ghaemi, E. F.
Powiązania:
https://bibliotekanauki.pl/articles/358520.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
C4 explosive
non-isothermal
decomposition
activation energy
Opis:
The thermal behaviour of energetic materials is very important for their safe production, storage, handling and even demilitarization. In this work, the thermal behaviour and decomposition kinetics of conventional C4 plastic explosive has been studied experimentally by a non-isothermal thermogravimetric (TG)/differential thermal analysis (DTA) technique at different heating rates (2, 4, 6 and 8 °C·min-1). The kinetic triplet of activation energy, frequency factor and model of thermal decomposition of this compound has been evaluated via model-fitting and model-free methods. The results show a single thermal decomposition process for C4, with the model of integral function (g(α)) of [(1−α)-1/3 −1]2 and differential function (f(α)) of [(1−α)2/3(3α−3)/2(1−α)1/3−2], indicating a 3-dimensional diffusion mechanism. In addition, Ea values of 207.1 ± 17.3, and 241 kJ·mol-1, by using the isoconversional model-free modified Kissinger-Akahira-Sunose (KAS) and the Kissinger method, respectively, were obtained for the conversion interval of 0.3-0.7. The C4 matrix shows a significant effect on the activation energy distribution of pure RDX.
Źródło:
Central European Journal of Energetic Materials; 2014, 11, 3; 405-416
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania wpływu temperatury i czasu suszenia na wybrane właściwości polilaktydu (PLA)
Research into time and drying temperature effect on selected properties of polylactide (PLA)
Autorzy:
Malinowski, R.
Łubkowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/2071301.pdf
Data publikacji:
2010
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
polilaktyd
izotermiczna krystalizacja
suszenie
polylactide
isothermal crystalization
drying
Opis:
W pracy przedstawiono wyniki badań wpływu temperatury i czasu suszenia na wybrane właściwości polilaktydu (PLA). Zbadano wpływ temperatury (T) (60°C, 80°C, 100°C, 120°C) oraz czasu (/) suszenia (maksymalnie do 6 godzin) na ubytek wilgoci (Am) i masowy wskaźnik szybkości płynięcia (MFR) PLA. Zbadano także proces krystalizacji PLA w warunkach izo-termicznych. Stwierdzono, że PLA korzystnie jest suszyć w temperaturze 75°C i w czasie około 4 godzin. Ponadto w zakresie temperatur od 100°C do 115°C mogą następować procesy krystalizacji izotermicznej tego polimeru.
Research results dealing with an influence of temperature and drying tir on selected properties of polylactide (PLA) are presented in the paper. Ti effect of drying temperature (7) (60°C, 80°C, 100°C, 120°C) and drying tin (0 (up to 6 hours) on humidity loss (Am) and mass flow rate (MFR) w. studied. Additionally, PLA crystallization process in isothermal conditio! was investigated. It was found that PLA can be dried advantageously temperature of 75°C and in time of about 4 hours. Moreover, at temperatun ranging from 100°C to 115°C isothermal crystallization processes of PL. may appear.
Źródło:
Inżynieria i Aparatura Chemiczna; 2010, 5; 77-78
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Method elaboration for determining heat losses within heat leakage bridges occurring in isothermal and cooling bodies
Autorzy:
Rochatka, T.
Powiązania:
https://bibliotekanauki.pl/articles/114272.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
heat leakage bridge
heat flux density
thermovision
isothermal body
Opis:
This paper presents the author’s method for the heat flux evaluation on the basis of a thermal photograph. This method is based on the comparison of surface temperatures of two areas where one of them is a thermally loaded with a known heat flux and the other control area which is not thermally loaded. With the method presented in the article analysing heat fluxes in places of high heat flux gradients occurring within heat leakage bridges, especially the service ones connected with the material humidity where heat flux density sensors can give substantial errors when the flux on the sensor surface is averaged.
Źródło:
Measurement Automation Monitoring; 2015, 61, 6; 242-244
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isothermal Stability and Selected Mechanical Properties of Zr48Cu36Al8Ag8 Bulk Metallic Glass
Autorzy:
Błyskun, P.
Latuch, J.
Kulik, T.
Powiązania:
https://bibliotekanauki.pl/articles/353937.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bulk metallic glasses
isothermal stability
mechanical properties
TTT curve
Opis:
The aim of this work was to investigate the influence of isothermal annealing on the amorphous structure stability of the Zr48 Cu36 Al8 Ag8 alloy. A series of continuous heating examinations was performed on the differential scanning calorimeter in order to determine the temperature limits for isothermal annealing series where the time to crystallization was measured. The obtained results were calculated and a time-temperature-transformation diagram was created and discussed. Static compression test as well as microhardness measurements of the as-quenched samples gave a mechanical properties results supplement. The measured properties (σc = 1800 MPa and 614 HV0.05) are comparable to the literature results for this alloy. Fractographic observations with the scanning electron microscope were also performed in order to prove some plasticity observed during the strength tests.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1749-1753
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Examining the degradation process of the heat/cold protecting insulation applied for construction of cooling bodies under the influence of water
Autorzy:
Rochatka, T.
Powiązania:
https://bibliotekanauki.pl/articles/114327.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
degradation of insulation material
heat flux
thermovision
isothermal body
Opis:
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 further destruction of the insulation properties by moisture which in the insulating material is subject to cyclic freezing and defrosting processes depending on the temperature of the transported goods. The paper presents the test results on the destruction of the insulating material under the influence of cyclic freezing and defrosting of water introduced into the insulating material. The effects of servicing the damp insulating material were examined depending on the quantity of cycles of freezing and defrosting getting much worse deterioration of insulating properties than in case of entering water into the dry insulating material.
Źródło:
Measurement Automation Monitoring; 2017, 63, 3; 119-121
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combined Influence of Silicon Content and Oxygen Concentration on the Oxidation Process of Silicon-Containing Steels
Autorzy:
Yuan, Q.
Xu, G.
Zhou, M.
He, B.
Hu, H.
Powiązania:
https://bibliotekanauki.pl/articles/352126.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silicone content
oxygen concentration
mass gain
isothermal holding time
Opis:
The combined influence of silicon content and oxygen concentration on silicon-containing steels was investigated, via a heating route similar to that applied in the industrial reheating process, using a Simultaneous Thermal Analyzer (STA). Four different oxygen concentrations and three different isothermal holding times were designed. The results show that the effect of silicon on the mass gain depends on the oxygen concentration and the oxidation time. The mass gain of low-silicon steel is greater than that of high-silicon steel at 1260°C in the oxygen concentrations of 1.0 vol.% and 2.0 vol.%, even when the isothermal holding time is 90 minutes. However, there is a critical time point for mass gain in oxygen concentrations ≥3.0 vol.%. The mass gain of lowsilicon steel is greater before and smaller after this critical point. The critical time is deferred with decreasing oxygen concentration.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 445-450
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanism and Kinetics Studies on Non-Isothermal Decomposition of Ludwigite in Inert Atmosphere
Autorzy:
Fu, X.
Chu, M.
Gao, L.
Liu, Z.
Powiązania:
https://bibliotekanauki.pl/articles/352128.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ludwigite
non-isothermal decomposition
kinetics
activation energy
model function
Opis:
Ludwigite is the main available boron-bearing resource in China. In order to enrich the theory system and optimize its utilization processes, this paper study the mechanism and kinetics on non-isothermal decomposition of ludwigite in inert atmosphere by means of thermal analysis. Results show that, the decomposition of serpentine and szajbelyite is the main cause of mass loss in the process. At the end of decomposition, hortonolite and ludwigite are the two main phases in the sample. The average E value of structural water decomposition is 277.97 kJ/mol based on FWO method (277.17 kJ/mol based on KAS method). The results is proved to be accurate and reliable. The mechanism model function of structural water decomposition is confirmed by Satava method and Popescu method. The form of the most probable model function is G(α) = (1 – α)–1– 1 (integral form) and f (α) = (1 – α)2 (differential form), and its mechanism is chemical reaction. This is verified by the criterion based on activation energy of model-free kinetics analysis.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1217-1224
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorption isotherm study of manganese removal from aqueous solutions by natural and MnO2-coated zeolite
Autorzy:
Demcak, Stefan
Kovacova, Zdenka
Balintova, Magdalena
Fazekas, Juraj
Zinicovscaia, Inga
Powiązania:
https://bibliotekanauki.pl/articles/2032858.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
adsorption
MnO2
zeolite
isothermal model
adsorpcja
zeolit
model izotermiczny
Opis:
The applicability of the natural and MnO2-coated zeolite as sorbent for the removal of Mn(II) from synthetic solutions has been investigated. Batch experiments were carried out to determine the influence of pH and Mn(II) concentration on the sorption process. A maximum removal efficiency (98.9%) was observed for modified zeolite with the concentration of 10 mg/dm3 of manganese in solution. The equilibrium data showed a very good correlation for both Langmuir and Freundlich sorption models and this suggests both monolayer adsorption and a heterogeneous surface existence. Maximum sorption capacity calculated from the Langmuir model constituted 5.57 mg/g for natural zeolite and 13.41 mg/g for modified zeolite.
Źródło:
Environment Protection Engineering; 2021, 47, 3; 17-24
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 81

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