Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7053836 | International Journal of Heat and Mass Transfer | 2018 | 8 Pages |
Abstract
The linear stability analysis of thermocapillary flow in an annular pool heated from inner wall was performed by using spectral element method. The physical instability mechanisms for different Prandtl numbers (Pr) ranging from 0.001 to 1.4 were studied by energy analysis under critical mode. We observed three instability types: (i) the Hopf (oscillatory) bifurcation with wavenumber kâ¯=â¯18 for Prâ¯<â¯0.02, and the corresponding neutral mode is amplified due to the basic shear flow; (ii) the stationary instability with kâ¯=â¯3 or kâ¯=â¯2 for 0.02â¯<â¯Prâ¯<â¯0.6; (iii) the Hopf bifurcation again with kâ¯=â¯3 for 0.6â¯<â¯Prâ¯<â¯1.4. In both Prandtl number ranges of 0.02â¯<â¯Prâ¯<â¯0.6 and 0.6â¯<â¯Prâ¯<â¯1.4, thermocapillary force induced by the disturbance temperature field drives primarily the flow instability.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Hao Liu, Zhong Zeng, Linmao Yin, Long Qiao, Liangqi Zhang,