2013 1(12)

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Pages:

134 - 140

Language:

RU

Ref.:

10


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VISUALIZATION INVESTIGATION OF FLUID FLOW OF THE SUBMERGED JET IN THE NARROW SLOT

Perepelitsa B.V.

Institute of Thermophysics SB RAS, Novosibirsk, Russia


Citation:

Perepelitsa, B.V., (2013) Visualization investigation of fluid flow of the submerged jet in the narrow slot, Modern Science: Researches, Ideas, Results, Technologies, Iss. #1(12), PP. 134 - 140.


Keywords:

submerged jet; flow regim; microchannels; coherent structures; instability; receptivity; visualization


Abstracts:

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. Experimental investigation of the submerged jet in the narrow slot is necessary for correct prediction of processes of heat transfer in apparatuses. Experimental data concerning the influence of initial conditions at the nozzle exit on the structure and development characteristics of micro-jet are reported. Features in the development of laminar and turbulent round jets emanating from variously elongated nozzles at Reynolds numbers are revealed. Various flow regimes of the submerged jet in the narrow 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 observe that the liquid symmetrically extends on periphery; except for a small zone near a nozzle (the perimeter has the circle form).


References:

  1. C. Gau, C.H. Shen, and Z.B. Wang, Peculiar Phenomenon of Micro-Free-Jet Flow, Physics of Fluids, Vol. 21, No. 9, Art no. 09 2001, 2009.

  2. C.J. Chang , C.H. Shen & Chie Gau (2013) Flow and Heat Transfer of a Micro Jet Impinging on a Heated Chip: Part I - Micro Free and Impinging Jet Flow, Nanoscale and Microscale Thermophysical Engineering, 17:1, 50-68,

  3. C.J. Chang , H.T. Chen & Chie Gau (2013) Flow and Heat Transfer of a Microjet Impinging on a Heated Chip: Part II - Heat Transfer, Nanoscale and Microscale Thermophysical Engineering, 17:2, 92-111.

  4. C. Gau, C.H. Shen, and Z.B. Wang, Peculiar Phenomenon of Micro-Free-Jet Flow, Physics of Fluids, Vol. 21, No. 9, Art no. 09 2001, 2009.

  5. Koller-Milojevic D., Schneider W. Free and confined jets at low Reynolds numbers// Fluid Dynamics Research. - 1993 - 12. - pp. 307-322.

  6. Dracos, T, Giger, M, and Jirka, G (1992) Plane turbulent jets in a bounded fluid layer //Journal of Fluid Mechanics, vol. 241, pp. 587-614.

  7. V.V. Kozlov, G.R. Grek, Yu.A. Litvinenko, et al., Vestn. NGU 5 (2), 28 (2010).

  8. В.Д. Жак, В.А. Мухин, В.Е. Накоряков, С.А. Сафонов. Распространение затопленной струи в узкой щели.// ПМТФ. -1985 - Том 151. - № 3.

  9. Lemanov V.V., Terekhov V.I., Sharov K.A., and A.A. Shumeiko A.A. An Experimental Study of Submerged Jets at Low Reynolds Numbers, ISSN 1063_7850, Technical Physics Letters, 2013, Vol. 39, No. 5, pp. 421-423.

  10. Perepelitsa B.V. and Shestakov M.V. Spatial structure of the flow at round jet out flow into a narrow channel.// Thermophysics and Aeromechanics, 2009, Vol. 16, No. 1, pp. 226-229.

 

 
     

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