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2 2008

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Effect of surface roughness on the performance of hydromagnetic squeeze film between conducting porous infinitely long rectangular plates

Vadher P. A., Deheri G. M., Patel R. M.

International Journal of Applied Mechanics and Engineering

2008

Vol. 13, no 2

473-498

An attempt has been made to study and analyze the performance of a hydromagnetic squeeze film between conducting porous rough infinitely long rectangular plates with electrically conducting lubricant in the presence of a transverse magnetic field. The bearing surfaces are assumed to be transversely rough. The random roughness is characterized by a stochastic random variable with non zero mean, variance and skewness. The associated Reynolds' equation is then stochastically averaged with respect to the random roughness parameter. This equation is solved with appropriate boundary conditions to find the pressure distribution, which is then used to obtain the load carrying capacity. Lastly, the response time is calculated. The results are presented graphically as well as in a tabular form. It is seen that the bearing system gets affected adversely owing to transverse surface roughness. But variance (-ve) tends to increase the load carrying capacity. Also, the bearing system resists an enhanced performance due to hydromagnetization. In addition, the load carrying capacity increases considerably due to conductivity while it decreases with respect to the aspect ratio The combined effect of porosity, the aspect ratio and the standard deviation associated with roughness is substantially adverse. However, this negative effect can be compensated to some extent by hydromagnetization and conductivity in the case of negatively skewed roughness. It is also observed that the bearing with magnetic field can support a load even when there is absence of flow. This investigation makes it plain and clear that roughness must be given due consideration while designing the bearing system.

Położenie belki polowej opryskiwacza a rozkład przestrzenny rozpylonej cieczy i pokrycie opryskiwanych powierzchni

Szewczyk A., Wilczok G.

Eksploatacja i Niezawodność

2008

nr 1

57-60

W opracowaniu przedstawiono wyniki prac prowadzonych od kilku lat w Instytucie Inżynierii Rolniczej Uniwersytetu Przyrodniczego we Wrocławiu. Celem tych badań było określenie położenia belki polowej opryskiwacza przy zmianie parametrów i warunków pracy. Zmiana ustawienia belki polowej w płaszczyźnie pionowej powoduje zmianę wysokości rozpylania poszczególnych rozpylaczy umieszczonych na belce jak i ich asymetryczne ustawienia w stosunku do opryskiwanych powierzchni pionowych. W związku z tym w wynikach badań przedstawiono również ocenę rozkładu poprzecznego opadu rozpylanej cieczy oraz stopień pokrycia opryskiwanych powierzchni w zależności od ustawienia belki. Wyniki badań wykazały, że każde wychylenie belki w płaszczyźnie pionowej powoduje zdecydowane pogorszenie jakości opryskiwania określanej przez wskaźnik zmienności rozkładu poprzecznego i stopień pokrycia.

The paper presents the research findings from the studies carried out for a number of years at the Institute of Agricultural Engineering of the Wroclaw University of Environmental and Life Sciences. The aim of the studies was to determine the position of the sprayer field beam when the working parameters and conditions vary. The change of the beam position in the vertical plane results in modifying the spraying height of the particular spray nozzles on the beam. This also leads to their asymmetrical arrangement in relation to the treated vertical surfaces. The research results also include the assessment of the transverse distribution of the sprayed liquid fall and the degree of coverage depending on the beam position. The results proved that each beam deflection in the vertical plane significantly reduced the spraying quality, which is measured by the variability index of the transverse distribution and the degree of coverage.