Transactions of the Korean Society of Mechanical Engineers (대한기계학회논문집)
- Volume 19 Issue 7
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- Pages.1731-1740
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- 1995
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- 1225-5963(pISSN)
DOI QR Code
Double-Diffusive Convection Due to Heating from Below in a Rotating Cylindrical Cavity
회전하는 원통형밀폐용기내의 아랫면가열에 의한 이중확산대류에 관한 실험적 연구
Abstract
Experimental investigations have been made to study the double-diffusive nature of convection of an initially stratified salt-water solution due to heating from below in a rotating cylindrical cavity. The objective is to examine the flow phenomena and the heat transfer characteristics according to the changes in temperature gradient, concentration gradient and rotating velocity of cavity. Thermal and solutal boundary conditions at side wall are adiabatic and impermeable, respectively. The top and bottom plate are maintained each at constant temperature and concentration. The cavity is put into a state of solid body rotation. Like the stationary case, the types of initially-formed flow pattern are classified into three regimes depending on the effective Rayleigh number and Taylor number; stagnant flow regime, single mixed-layer flow regime and successively formed multi-mixed layer flow regime. At the same effective Rayleigh number, the number of initially-formed mixed layer and its growth rate decrease as the effect of rotation increases. The temperature and concentration profiles are both uniform in each layer due to convective mixing in the layered-flow regime, but look both liner in stagnant flow regime and single mixed-layer flow regime. At the interface between adjacent layers, the temperature changes smoothly but the concentration changes rapidly.
Keywords
- Double-Diffusive Convection;
- Rotating Cylindrical Cavity;
- Heating-Form-Below;
- Effective Rayleigh Number;
- Taylor Number
- 이중확산대류;
- 회전원통용기;
- 아랫면가열;
- $Ra_{\eta}$;
- Ta 수;