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Wyszukujesz frazę "internal heating" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
The effect of modulation on heat transport by a weakly nonlinear thermal instability in the presence of applied magnetic field and internal heating
Autorzy:
Manjula, S. H.
Kiran, Palle
Narsimlu, G.
Roslan, R.
Powiązania:
https://bibliotekanauki.pl/articles/1839705.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
modulacja
pole magnetyczne
ogrzewanie
Ginzburg-Landau equation
temperature modulation
applied magnetic field
internal heating
Opis:
The present paper deals with a weakly nonlinear stability problem under an imposed time-periodic thermal modulation. The temperature has two parts: a constant part and an externally imposed time-dependent part. We focus on stationary convection using the slow time scale and quantify convective amplitude through the real Ginzburg-Landau equation (GLE). We have used the classical fourth order Runge-Kutta method to solve the real Ginzburg-Landau equation. The effect of various parameters on heat transport is discussed through GLE. It is found that heat transport analysis is controlled by suitably adjusting the frequency and amplitude of modulation. The applied magnetic field (effect of Ha) is to diminish the heat transfer in the system. Three different types of modulations thermal, gravity, and magnetic field have been compared. It is concluded that thermal modulation is more effective than gravity and magnetic modulation. The magnetic modulation stabilizes more and gravity modulation stabilizes partially than thermal modulation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 96-115
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis and internal heating effect on oscillatory convection in a viscoelastic fluid saturated porous medium under gravity modulation
Autorzy:
Bhadauria, B. S.
Singh, M. K.
Singh, A.
Singh, B. K.
Kiran, P.
Powiązania:
https://bibliotekanauki.pl/articles/265014.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza stabilności
grawitacja
ciecz lepkosprężysta
nonlinear stability analysis
complex Ginzburg-Landau equation
gravity modulation
internal heating
bifurcation
Opis:
In this paper, we investigate the combined effect of internal heating and time periodic gravity modulation in a viscoelastic fluid saturated porous medium by reducing the problem into a complex non-autonomous Ginzgburg-Landau equation. Weak nonlinear stability analysis has been performed by using power series expansion in terms of the amplitude of gravity modulation, which is assumed to be small. The Nusselt number is obtained in terms of the amplitude for oscillatory mode of convection. The influence of viscoelastic parameters on heat transfer has been discussed. Gravity modulation is found to have a destabilizing effect at low frequencies and a stabilizing effect at high frequencies. Finally, it is found that overstability advances the onset of convection, more with internal heating. The conditions for which the complex Ginzgburg-Landau equation undergoes Hopf bifurcation and the amplitude equation undergoes supercritical pitchfork bifurcation are studied.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 4; 785-803
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of thermal modulation on double diffusive convection in the presence of applied magnetic field and internal heat source
Autorzy:
Manjula, S. H.
Suresh, P.
Rao, M. G.
Powiązania:
https://bibliotekanauki.pl/articles/1839901.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
analiza nieliniowa
płyn newtonowski
konwekcja
thermal modulation
weak nonlinear analysis
internal heating
newtonian fluid
double diffusive convection
Opis:
The investigation of thermal modulation on double-diffusive stationary convection in the presence of an applied magnetic field and internal heating is carried out. A weakly nonlinear stability analysis has been performed using the finite-amplitude Ginzburg-Landau model. This finite amplitude of convection is obtained at the third order of the system. The study considers three different forms of temperature modulations. OPM-out of phase modulation, LBMO-lower boundary modulation, IPM-in phase modulation. The finite-amplitude is a function of amplitude ,Tδ frequency ω and the phase differenceθ . The effects of Tδ and ω on heat/mass transports have been analyzed and depicted graphically. The study shows that heat/mass transports can be controlled effectively by thermal modulation. Further, it is found that the internal Rayleigh number iR enhances heat transfer and reduces the mass transfer in the system.
Źródło:
International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 135-155
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Heating System Local Control on Energy Consumption in Apartment Buildings
Autorzy:
Deshko, Valerii
Bilous, Inna
Maksymenko, Oleksandra
Powiązania:
https://bibliotekanauki.pl/articles/27315745.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
energy saving
internal temperature
energy control
consumption energy for heating
residential buildings
modelling
Opis:
Improving the energy efficiency of residential buildings is ensured by improving the thermal protection characteristics and the wider introduction of control tools. In order to take into account the influence of individualisation of operating conditions, the study of the regulation of heating distribution of a single-pipe system with bypassed heating devices of a 5-storey typical for Ukraine mass building of the 80s after thermos-modernisation for conditions in Kyiv and Warsaw (Poland) was carried out. On the basis of the simulation model created in the Mathcad software environment for design/rated and average climatic conditions, the influence of internal heat flows into adjacent rooms on the distribution of energy consumption, changes in internal air temperature under the influence of local changes in the heating device flow coefficients were studied. The developed approaches, and the results obtained on the influence of local regulation of devices of vertical single-pipe heating systems can be used to clarify the distribution of energy consumption for heating between individual zones of apartment buildings.
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 77--85
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Klimat wewnętrzny w hali lodowiska krytego, sztucznie mrożonego
Interior climate in the hall of the indoor, artificially frozen ice rink
Autorzy:
Kosieniak, M.
Powiązania:
https://bibliotekanauki.pl/articles/163176.pdf
Data publikacji:
2018
Wydawca:
Polski Związek Inżynierów i Techników Budownictwa
Tematy:
Bydgoszcz
lodowisko sztuczne
rozwiązanie techniczne
klimat wewnętrzny
system grzewczy
system wentylacyjny
ice rink
technical solution
internal climate
heating system
ventilation system
Opis:
W artykule wskazano nowoczesny sposób utrzymania klimatu wewnątrz krytej hali lodowiska w Bydgoszczy. Zaprezentowano technikę wentylacji, ogrzewania i osuszania, jaką zastosowano w obiekcie wraz z podaniem parametrów obliczeniowych i parametrów technologicznych wytworzenia sztucznego lodu. Wskazano na ważne aspekty, jakie należy spełnić przy projektowaniu klimatu w takich pomieszczeniach oraz opisano rozwiązania dla oszczędności energii w tym obiekcie.
The article describes the modern of maintaining climate inside the covered ice rink hall in Bydgoszcz. The technique of ventilating, heating and dehumidification applied in this building as well as calculating methodes and technological parameters for making artificial ice are presented. Aspects essential in designing climate in such buildings together with applied energy saving methodes are discussed in article as well.
Źródło:
Przegląd Budowlany; 2018, 89, 4; 36-38
0033-2038
Pojawia się w:
Przegląd Budowlany
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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