Temat: vertical channel - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Thermal performance enhancement of the mixed convection between two parallel plates by using triangular ribs
Autorzy:: Jehhef, K. A.
Badawy, F. A.
Hussein, A. A.
Powiązania:: https://bibliotekanauki.pl/articles/1839881.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: badanie numeryczne
konwekcja mieszana
równanie Naviera-Stokesa
numerical study
mixed convection
vertical channel
triangular rib
Opis:: This paper aims to investigate the mixed convection between two parallel plates of a vertical channel, in the presence of a triangular rib. The non-stationary Navier-Stokes equations were solved numerically in a two-dimensional formulation for the low Reynolds number for the laminar air flow regime. Six triangular ribs heat-generating elements were located equidistantly on the heated wall. The ratio of the ribs to the channel width is varied (h / H = 0.1, 0.2, 0.3 and 0.4) to study the effect of ribs height effects, the ratio of the channel width to the ribs height is fixed constant at (H / w = 2) and the ratio of the channel height to the ribs pitch is fixed at (W/p=10). The influence of the Reynolds number that ranged from 68 to 340 and the Grashof number that ranged from 6.6 ×103 to 2.6 ×104 as well as the Richardson number chosen (1.4, 0.7, 0.4 and 0.2) is studied. The numerical results are summarized and presented as the profile of the Nusselt number, the coefficient of friction, and the thermal enhancement factor. The contribution of forced and free convection to the total heat transfer is analyzed. Similar and distinctive features of the behavior of the local and averaged heat transfer with the variation of thermal gas dynamic and geometric parameters are investigated in this paper. The results showed that the Nusselt number and friction factor increased by using the attached triangular ribs, especially when using the downstream ribs. Also, the results revealed that the Nusselt number increased by increasing the ratio of the ribs to the channel width.
Źródło:: International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 11-30
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Theoretical studies of the ellipsoidal-shaped particles’ behaviourin the channel of pneumo-electric separator bumping into its walls
Autorzy:: Kovalyshyn, S.
Dadak, V.
Powiązania:: https://bibliotekanauki.pl/articles/410879.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:: seed mixture
ellipsoidal-shaped particle
pneumo-electric separator
vertical channel
mathematical model
adjustable settings
Opis:: It is widely known that during the post-harvest handling of a number of crops pneumatic separators are often used. It is proved that in order to improve separation process by using an air flow becomes possible through the use in the separation channels an electric field of corona discharge as additional working body. The electric field makes an additional force effect on the particles of the separated mixture. Since the seeds of cultivated plants and weeds belong to different species, their electrical properties interact with the working bodies of pneumatic separators in different ways that enables quality improvement of seed mixtures separation. We consider the ellipsoidal particles’ behaviour under the influence of gravity, electric power and air flow in pneumo-electric separator channel taking into account their bumping into the walls. We also worked out the differential equations that reflect the mathematical model of the particles under the totality of these forces. This model describes the movement of particles in the pneumo-electric separator channel and allows at any time to calculate the coordinates of trajectories. Based on their analysis we can explore the influence of the controlled process parameters on the pneumo-electric separation and determine their optimal parameters under which the separation of the investigated seed mixtures is the most effective and the components of which are of ellipsoid shape.
Źródło:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 3; 147-152
2084-5715
Pojawia się w:: ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Microclimate in cattle barns with functional attic and roof ridge gap
Mikroklimat obór z poddaszem użytkowym i szczeliną kalenicową
Autorzy:: Mazur, K.
Powiązania:: https://bibliotekanauki.pl/articles/337237.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:: microclimate
natural ventilation
air temperature
relative humidity
ammonia
animal welfare
vertical channel
ventilation channel
mikroklimat
wentylacja naturalna
temperatura powietrza
wilgotność względna
amoniak
dobrostan zwierząt
kanał pionowy
kanał wentylacyjny
Opis:: The aim of this article to present of research results of microclimate parameters in barns with different gravitational ventilation systems and comparison of efficiency of these systems. Two tied-up and three loose-housing barns for dairy cows and one for beef cattle were researched. Tied-up barns had functional attic and duct ventilation, in barns with loose housing systems there were skylights with roof ridge gap. In stalls with ventilation by vertical channels there was not sufficient area of air inflow and outflow. The negative consequence of this was overcoming of recommended internal relative humidity of air (80%) in these stalls. In non-littered barns, with roof- ridge gap ventilation, temperature of air exceeded recommended values of 25oC. The luminance of daily light in stalls with functional attic was below of minimal level, which was described by standards (100 lx).
Celem niniejszego artykułu jest przedstawienie wyników badań parametrów mikroklimatu w oborach z dwoma różnymi systemami wentylacji grawitacyjnej i porównanie skuteczności tych systemów. Zbadano po dwie obory stanowiskowe i wolnostanowiskowe dla krów mlecznych oraz jedną dla bydła mięsnego. Obory stanowiskowe posiadały poddasze użytkowe z wentylacją kanałową, natomiast w pozostałych oborach był świetlik ze szczeliną kalenicową. W oborach z wentylacją pionowymi kanałami nie była zapewniona odpowiednia powierzchnia nawiewu i wywiewu. Negatywnym tego skutkiem było przekroczenie zalecanych wartości wilgotności względnej powietrza (80%) w tych oborach. Temperatura w oborach bezściółkowych z wentylacją kalenicową przekraczała zalecane standardami wartości (25oC). Natężenie oświetlenia dziennego, w oborach z poddaszem użytkowym było poniżej minimalnego poziomu określonego standardami (100 lx).
Źródło:: Journal of Research and Applications in Agricultural Engineering; 2014, 59, 2; 61-66
1642-686X
2719-423X
Pojawia się w:: Journal of Research and Applications in Agricultural Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Investigations of Couette flow unsteady radiative convective heat transfer in a vertical channel using the generalized method of lines (MOL)
Autorzy:: Sowayan, Ahmed S.
Powiązania:: https://bibliotekanauki.pl/articles/2174210.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: promieniowanie
konwekcja naturalna
metoda Runge-Kutty
vertical channel
radiation
natural convection
method of lines (MOL)
Runge-Kutta method
Opis:: This study describes a very efficient and fast numerical solution method for the non-steady free convection flow with radiation of a viscous fluid between two infinite vertical parallel walls. The method of lines (MOL) is used together with the Runge-Kutta ODE Matlab solver to investigate this problem numerically. The presence of radiation adds more stiffness and numerical complexity to the problem. A complete derivation in dimensionless form of the governing equations for momentum and energy is also included. A constant heat flux condition is applied at the left wall and a transient numerical solution is obtained for different values of the radiation parameter (R). The results are presented for dimensionless velocity, dimensionless temperature and Nusselt number for different values of the Prandtl number (Pr), Grashof number (Gr), and the radiation parameter (R). As expected, the results show that the convection heat transfer is high when the Nusselt number is high and the radiation parameter is low. It is also shown that the solution method used is simple and efficient and could be easily adopted to solve more complex problems.
Źródło:: International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 199--211
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Effects of viscous dissipation and wall conduction on steady mixed convection Couette flow of heat generating / absorbing fluid
Autorzy:: Ajibade, A. O.
Umar, A. M.
Powiązania:: https://bibliotekanauki.pl/articles/264671.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: strumień masy
kanał pionowy
konwekcja mieszana
mixed convection
viscous dissipation
vertical channel
boundary thickness
mass constant flux
Opis:: This article theoretically investigated mixed convection flow of heat generating/absorbing fluid in the presence of viscous dissipation and wall conduction effects. The flow is considered to be steady in a vertical channel with some boundary thickness. One of the plates is heated while the other is kept at ambient temperature. The governing flow equations were solved analytically using Homotopy Perturbation Method (HPM). The influences of the governing parameters were captured in graphs, tables and a table was constructed for validation of the work. It is worthwhile to stress that, both the velocity and temperature profiles decrease near the heated plate with an increase in boundary thickness (d) while the reverse cases were observed toward the cold plate. The velocity profile increases near the heated plate with increase in mixed convection parameter (Gre) and decreases towards the cold plate. Rate of heat transfer has been observed to decrease with increase in boundary plate thickness (d) while the critical value of (Gre) increases with growing boundary plate thickness. The study therefore established the importance of boundary plate thickness in mixed convection investigation.
Źródło:: International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 12-35
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Development of 3C-SiC MOSFETs
Autorzy:: Bakowski, M.
Schöner, A.
Ericsson, P.
Strömberg, H.
Nagasawa, H.
Masayuki, A.
Powiązania:: https://bibliotekanauki.pl/articles/308791.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: vertical MOSFET
3C-SiC
channel mobility
Opis:: The paper reviews the development of the 3C-SiC MOSFETs in a unique development project combining the material and device expertise of HAST (Hoya Advanced Semiconductor Technologies) and Acreo, respectively. The motivation for the development of the 3C-SiC MOSFETs and the summary of the results from the lateral and vertical devices with varying size from single cell to 3×3 mm2 large devices are reviewed. The vertical devices had hexagonal and square unit cell designs with 2 žm and 4 žm channel length. The p-body was aluminum implanted and the source was nitrogen or phosphorus implanted. Low temperature Ti/W contacts were evaluated.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 2; 49-56
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Convective flow of hydromagnetic couple stress fluid with varying heating through vertical channel
Autorzy:: Makhalemele, C. R.
Rundora, L.
Adesanya, S. O.
Powiązania:: https://bibliotekanauki.pl/articles/1839878.pdf
Data publikacji:: 2021
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: pole magnetyczne
płyn nieściśliwy
wymiana ciepła
induced magnetic field
couple stresses
vertical channel
varying heating
Opis:: This article addresses the impact of magnetic field induction on the buoyancy-induced oscillatory flow of couple stress fluid with varying heating. Modelled equations for the incompressible fluid are coupled and nonlinear due to the inclusion of viscous heating and thermal effect on the fluid density. Approximate solutions are constructed and coded on a symbolic package to ease the computational complexity. Graphical representations of the symbolic solutions are presented with detailed explanations. Results of the present computation show that the effect of induced magnetic field on the oscillatory flow and heat transfer is significant and cannot be neglected.
Źródło:: International Journal of Applied Mechanics and Engineering; 2021, 26, 2; 107-127
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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