2013 1(12)

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Perepelitsa B.V., Ovchinnikov V.V.

Institute of Thermophysics SB RAS, Novosibirsk, Russia


Perepelitsa, B.V. and Ovchinnikov, V.V., (2013) Effect of the microstructure of the wall on the flow of the submerged jet in the narrow slot, Modern Science: Researches, Ideas, Results, Technologies, Iss. #1(12), PP. 141 - 146.


submerged jet; flow regim; sinusoidal instability; vortex structures; microchannels; microtexture of wall


Hydrodynamics research in mini and micro channels is very important for development of various new compact devices. The special attention last years is given to the structured solid surfaces with various micro channels which provide heat and mass transfer intensification. The flows in narrow channels are especially difficult for theory and numerical simulation. Presence of horizontally oriented micro texture of the solid wall leads to occurrence of more complex structure of flow. Experimental investigation of the submerged jet in the narrow slot is necessary for correct prediction of processes of heat transfer in apparatuses with micro textured wall surface. Various flow regimes of the submerged jet in the slot channel have been investigated. The following flow regimes were revealed: the laminar, the laminar with two-dimensional vortex structures, transient regime and a turbulent regime. It is shown, that different instabilities appear above Reynolds number 450. Development of sinusoidal instability leads to formation of vortex structures. Feature of a flow of a jet in the narrow slot is the long laminar initial sector. With increase of number of Reynolds the length of a laminar sector of a jet decreases and of a jet breakup point come nearer to a nozzle. It is shown that micro textured presence on a wall of slot leads to anisotropy of a flow concerning an axis of jet. It is observe that the liquid symmetrically extends on periphery; except for a small zone near a nozzle (the perimeter has the circle form).


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