Erscheint 12 Ausgaben pro Jahr
ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684
Indexed in
ABSOLUTE AND CONVECTIVE INSTABILITY OF CYLINDRICAL LIQUID JETS IN CO-FLOWING GAS STREAMS
ABSTRAKT
This article reports the absolute and convective instability of a cylindrical liquid jet in a co-flowing inviscid gas stream. An efficient mesh-searching method is developed to determine the absolute instability and the critical Weber number which separates the region of absolute from that of convective instability. It is found that both gas velocity and density may increase or decrease the critical Weber number and may promote or suppress the absolute instability, depending on flow conditions, and that it is the absolute rather than the relative velocity that governs the absolute instability. For Weber numbers larger than the critical values, the instability of liquid jets becomes convective. The absolute gas and liquid velocity at low Weber numbers and the relative velocity between the liquid and gas at high Weber numbers control the spatial growth rate, and may enhance significantly jet breakup process at high gas velocities. Surface tension has both stabilizing ( for short waves ) and destabilizing ( for long waves ) effects on the convective growth rate whenever there exists velocity discontinuity across the liquid-gas interface. Otherwise, it always promotes the jet instability. The gas-to-liquid density ratio shows a completely opposite effect for equal and unequal gas and liquid velocities, while liquid viscosity always has a damping effect.
-
Sevilla A., Gordillo J. M., Martínez-Bazán C., Transition from bubbling to jetting in a coaxial air–water jet, Physics of Fluids, 17, 1, 2005. Crossref
-
Chen Tingbao, Li Xianguo, Liquid Jet Atomization in a Compressible Gas Stream, Journal of Propulsion and Power, 15, 3, 1999. Crossref
-
Liu Hai-Feng, Li Wei-Feng, Gong Xin, Cao Xian-Kui, Xu Jian-Liang, Chen Xue-Li, Wang Yi-Fei, Yu Guang-Suo, Wang Fu-Chen, Yu Zun-Hong, Effect of liquid jet diameter on performance of coaxial two-fluid airblast atomizers, Chemical Engineering and Processing: Process Intensification, 45, 4, 2006. Crossref
-
Yang Li-Jun, Tong Ming-Xi, Fu Qing-Fei, Linear stability analysis of a three-dimensional viscoelastic liquid jet surrounded by a swirling air stream, Journal of Non-Newtonian Fluid Mechanics, 191, 2013. Crossref
-
Li X., Bhunia A., Instability of plane compressible gas sheets, Acta Mechanica, 123, 1-4, 1997. Crossref