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Wyszukujesz frazę "thermal DTM" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Thermal Digital Terrain Model of a Coal Spoil Tip – A Way of Improving Monitoring and Early Diagnostics of Potential Spontaneous Combustion Areas
Autorzy:
Lewińska, P.
Dyczko, A.
Powiązania:
https://bibliotekanauki.pl/articles/952399.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
spoil tips
infrared
spontaneous combustion
monitoring
thermal DTM
Opis:
Spoil tips are anthropomorphic terrain structures built out of leftover materials from underground or open pit mining. Usually the term spoil tips refers to those build out of unusable particles from coal exploration. As such they consist mostly of slate and various types of sandstone or mudstone. But also include some amount of coal and, what is more important, coal dust. Fires of spoil tips are dangerous to the environment and humans. They can cause degradation of air, and water qualities. Sometimes degradation to the environment can be irreversible. The presented survey was done in two stages. the first included creating a general terrain model. This was done with the use of long range laser scanner. The second step was a more detailed analysis of spatial and temperature conditions. Two measuring seasons ware performed. The first included a survey made with a short range laser scanner and a hand-held inferred camera. The obtained point cloud was supplemented with temperature value with the use of software and hardware provided by the authors. The visualization of 3D discreet thermal model was done in Bentley MicrioStation. The second included a usage of Z+F IMAGER 5010 laser scanner equipped with T-Cam Rev 1.0 thermal camera insole. A new and unique device that connects laser scanner with infrared camera. This season also provide a point cloud with attached temperature value of measured points. This article provides the description of those two methods including a comparison of their effectiveness and costs. It also describes the heat conditions occurring on spoil tip of Lubelski Węgiel „Bogdanka” S.A coal mine surveyed in December 2015.
Źródło:
Journal of Ecological Engineering; 2016, 17, 4; 170-179
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal analysis of the convective-radiative fin with a step change in thickness and temperature dependent thermal conductivity
Autorzy:
Torabi, M.
Yaghoobi, H.
Kiani, M. R.
Powiązania:
https://bibliotekanauki.pl/articles/281516.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
step straight fin
simultaneous convection and radiation
temperature dependent thermal conductivity
DTM analytical technique
Opis:
This paper provides heat transfer analysis in a straight fin with a step change in thickness and variable thermal conductivity, which is losing heat by simultaneous convection and radiation. The calculations are carried out by using the differential transformation method (DTM) that can be applied to various types of differential equations. The results obtained employing DTM are compared with an accurate numerical solution to verify the accuracy of the proposed method. Several graphs are provided to illustrate how the temperature distribution is affected by the (i) thickness parameter, (ii) dimensionless fin semi thickness, (iii) length ratio, (iv) thermal conductivity parameter, (vi) Biot’s number, and (vii) radiation-conduction parameter. This collection of graphs provides a comprehensive picture of the thermal performance of the system under steady state conditions.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 593-602
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixed convective fully developed flow in a vertical channel in the presence of thermal radiation and viscous dissipation
Autorzy:
Prasad, K. V.
Mallikarjun, P.
Vaidya, H.
Powiązania:
https://bibliotekanauki.pl/articles/265697.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mixed convection
thermal radiation
viscous dissipation
Differential Transform Method (DTM)
Perturbation Method (PM)
konwekcja mieszana
promieniowanie cieplne
metoda transformacji różnicowej
metoda zakłóceń
Opis:
The effect of thermal radiation and viscous dissipation on a combined free and forced convective flow in a vertical channel is investigated for a fully developed flow regime. Boussinesq and Roseseland approximations are considered in the modeling of the conduction radiation heat transfer with thermal boundary conditions (isothermal-thermal, isoflux-thermal, and isothermal-flux). The coupled nonlinear governing equations are also solved analytically using the Differential Transform Method (DTM) and regular perturbation method (PM). The results are analyzed graphically for various governing parameters such as the mixed convection parameter, radiation parameter, Brinkman number and perturbation parameter for equal and different wall temperatures. It is found that the viscous dissipation enhances the flow reversal in the case of a downward flow while it counters the flow in the case of an upward flow. A comparison of the Differential Transform Method (DTM) and regular perturbation method (PM) methods shows the versatility of the Differential Transform Method (DTM). The skin friction and the wall temperature gradient are presented for different values of the physical parameters and the salient features are analyzed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 123-144
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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