An experimental research on surface oscillation of buoyant-thermocapillary convection in open cylindrical annuli  

作　　者：Li Zhang Li Duan Qi Kang 

机构地区：[1]National Microgravity Laboratory,Institute of Mechanics Chinese Academy of Sciences

出　　处：《Acta Mechanica Sinica》2014年第5期681-686,共6页力学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(11032011 and 10972224);Knowledge Innovation Program of Chinese Academy of Sciences(KJCX2-YW-L08)

摘　　要：An experiment is carried out on the surface oscillation of buoyant-thermocapillary convection in an open cylindrical annulus. When the radial temperature difference AT reaches a critical value △Tc, a regular oscillation appears and soon disappears on the open surface, which varies when the liquid layer＇s thickness h and temperature difference △T are varied. With growth of △T, dominant frequency of the visible oscillation will grow too but is found within certain frequencies. Driving forces, buoyance and thermocapillarity, are responsible for this phenomanon and the ＂balance＂ point is considered to exist when h is between 4.5-5.0 mm. Surface oscillation region is also found restricted within a narrow gap when Bo is smaller than 3.7.An experiment is carried out on the surface oscillation of buoyant-thermocapillary convection in an open cylindrical annulus. When the radial temperature difference AT reaches a critical value △Tc, a regular oscillation appears and soon disappears on the open surface, which varies when the liquid layer＇s thickness h and temperature difference △T are varied. With growth of △T, dominant frequency of the visible oscillation will grow too but is found within certain frequencies. Driving forces, buoyance and thermocapillarity, are responsible for this phenomanon and the ＂balance＂ point is considered to exist when h is between 4.5-5.0 mm. Surface oscillation region is also found restricted within a narrow gap when Bo is smaller than 3.7.

关 键 词：Cylindrical annulus Buoyant-thermocapillary convection Surface oscillation Critical temperature differ- ence 

分 类 号：O363.2[理学—流体力学]