Wyniki wyszukiwania - BazTech

1

Hall effects on isothermal vertical plate with uniform mass diffusion in the presence of rotating fluid and chemical reaction of first order

Dhananjeya Kumaar V. S. A., Muthucumaraswamy R.

International Journal of Applied Mechanics and Engineering

|

2017

|

Vol. 22, no. 1

111--121

EN

An exact solution of the combined study of Hall effects on a vertical plate with a rotating fluid in the presence of a homogeneous chemical reaction of first order has been analysed. The dimensionless governing coupled partial differential equations are tackled using the usual Laplace transform technique. The sway of the Hall parameter, Hartmann number, Grashof number, Prandtl number, Schmidt number, chemical reaction parameter on the axial velocity and concentration of the fluid has been depicted graphically. When the non-dimensional angular velocity, Ω=2M21+m.2, the transverse velocity component vanishes, thereby the axial velocity of the fluid attains the maximum value. It is noted that with increase in the Hall parameter, thermal Grashof number and mass Grashof number, the axial velocity of the fluid increases significantly.

2

MHD two-layered unsteady fluid flow and heat transfer through a horizontal channel between

Linga Raju T., Nagavalli M.

International Journal of Applied Mechanics and Engineering

|

2014

|

Vol. 19, no. 1

97--121

EN

An unsteady magnetohydrodynamic (MHD) two-layered fluids flow and heat transfer in a horizontal channel between two parallel plates in the presence of an applied magnetic and electric field is investigated, when the whole system is rotated about an axis perpendicular to the flow. The flow is driven by a constant uniform pressure gradient in the channel bounded by two parallel insulating plates, when both fluids are considered as electrically conducting, incompressible with variable properties, viz. different viscosities, thermal and electrical conductivities. The transport properties of the two fluids are taken to be constant and the bounding plates are maintained at constant and equal temperatures. The governing partial differential equations are then reduced to the ordinary linear differential equations using two-term series. Closed form solutions for primary and secondary velocity, also temperature distributions are obtained in both the fluid regions of the channel. Profiles of these solutions are plotted to discuss the effects of the flow and heat transfer characteristics, and their dependence on the governing parameters involved, such as the Hartmann number, rotation parameter, ratios of the viscosities, heights, electrical and thermal conductivities.

3

Zastosowanie elementów hydraulicznych w projekcie tarczy korekcyjnej do układu redukcji niewyważenia w wentylatorach

Rumin R., Mikulik J.

Napędy i Sterowanie

|

2013

|

R. 15, nr 7/8

130--134

PL

W inteligentnych budynkach przemysłowych wentylatory znajdują bardzo szerokie zastosowanie w układach wentylacyjnych oraz transporcie pneumatycznym. W przypadku pracy w środowisku o wysokim zapyleniu istnieje ryzyko pojawienia się uszkodzenia wentylatora. Na skutek nierównomiernego osadzenia się pyłów na łopatach wentylatora powstaje niewyważenie, które powoduje drgania wirnika. Dla dalszego bezpiecznego działania maszyny należy zatrzymać jej pracę w celu oczyszczenia łopat. Tego typu konserwacja urządzenia pozwoli na redukcję jego drgań i uniknięcie jego uszkodzenia. Niestety jest to kosztowna i czasochłonna operacja, która z powodzeniem mogłaby być odsunięta w czasie aż do planowego serwisu urządzenia, pod warunkiem wykorzystania układu do automatycznego wyważania wentylatora. W artykule opisano układ do redukcji drgań maszyn wirujących poprzez ich automatyczne wyważanie. Przedstawiono projekt tarczy korekcyjnej, wewnątrz której znajdują się komory magazynujące płyn hydrauliczny, pełniący rolę masy korekcyjnej.

EN

Industrial fans are widely used in air-conditioning and air transport in intelligent buildings. Working in an environment with a lot of dust will bring a high risk of damage to the fan. Not symmetric deposition of dust on the fan blades can create an imbalance of the rotor that causes vibration. It is necessary to stop its work and clean the blades often to keep safe operation of the machine. This type of maintenance work will reduce the vibration and prevent damage. Unfortunately, this is a costly and time-consuming operation. We can get similar results without those disadvantages when it will be used a system for automatically balancing of the fan. This paper describes a system for reduction of vibration for rotating machinery by its automatic balancing. It was presented design of correction disc, within which there are hydraulic chamber for fluid storage as a correction mass.

4

Effect of the magnetic field and suspended particles on thermosolutal instability of a rotating Rivlin-Ericksen fluid with varying gravity field in a porous medium

Singh V., Dixit S.

International Journal of Applied Mechanics and Engineering

|

2012

|

Vol. 17, no. 2

559-570

EN

In the paper we consider thermal instability of a rotating Rivlin-Ericksen viscoelastic fluid in the presence of suspended particles in a porous medium, the effect of magnetic field with varying gravity field are also studied. It is found that for stationary convection, a Rivlin-Ericksen fluid behaves like an ordinary Newtonian fluid while the magnetic field has both stabilizing and destabilizing effect on the system. Other different aspects affecting stability are also considered.