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Uwagi o bilansie masy i pędu w gradientowej termomechanice

Kubik J.

Roczniki Inżynierii Budowlanej

2015

z. 15

97--101

In the work energy of mechanical and diffusive transformations is analysed in terms of the gradient thermomechanics and calculus of variations. As a result of the considerations new forms of the partial diffusing mass and momentum balances of the thermomechanical process are derived in comparison with the classical theory.

Pneumatic actuators with "bouncing" air-jet - part 2: Flow field in the cascade

Tesar V., Peszyński K.

International Journal of Applied Mechanics and Engineering

2010

Vol. 15, no 3

867-874

Unusual actuators generating a fluid force action on a small body by issuing an air jet "reflecting" or "bounding back" from an impact on a wall were described in previous publication (Tesar and Peszynski, 2010). The seemingly impossible return from the wall is based on the unusual effect of the wall provided with perforations that allow a part of the jet to pass through. Upon the impingement, the jet is split in two parts, both having to change their directions. It is the part that remains above the wall, the "reflected" jet, that is of interest for the actuation. In particular, the phenomenon was used in shuttle-less loom to prevent the inserted weft from contact with the reed. The details of the flowfield inside the reed - or cascade of foils with passages between them play a critical role in the phenomenon. This was investigated by flow visualisation discussed in the second part of the paper.

Pneumatic actuators with "bouncing" air-jet - part 1: Numerical solutions

Tesar V., Peszyński K.

International Journal of Applied Mechanics and Engineering

2010

Vol. 15, no 3

855-865

An actuator generating a force action on a small body by an issuing air jet is based on the unusual, little known and seemingly impossible mechanism of the jet "reflecting" or "bouncing back" from an impact on a solid wall. Under usual conditions the bouncing back from the wall is not possible - the trick is the wall is provided with perforations that allow a part of the jet to pass through. On doing so it has to change its direction and this has to be compensated by the remaining part changing its direction too, into the opposite side as seen from the jet axis. This part forms the "reflected" jet. The phenomenon is investigated by flow visualisation and detailed flowfield computations presented in this paper - the first part of which discusses the computed results.