한국전산유체공학회지 (Journal of computational fluids engineering)

한국전산유체공학회 (Korean Society of Computational Fluids Engineering)
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일정 온도 벽면을 갖는 수평 환형공간 내의 유체의 자연 대류에서의 삼중해

TRIPLE SOLUTIONS IN NATURAL CONVECTION OF A FLUID IN A HORIZONTAL ANNULUS WITH CONSTANT TEMPERATURE WALLS

  • 유주식 (안동대학교 기계교육과)
  • Yoo, Joo-Sik (Dept. of Mechanical Engineering Education, Andong Nat'l Univ.)
  • 투고 : 2017.01.26
  • 심사 : 2017.03.13
  • 발행 : 2017.03.31
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초록

Natural convection of a fluid with the Prandtl number of 7(water) in a horizontal annulus with constant temperature walls is numerically investigated. The inner cylinder is hotter than the outer cylinder. The flows are classified by the number of eddies in a half annulus. It is found that dual or triple solutions exists above a critical Rayleigh number for an annulus with a aspect ratio $D_i/L=4$. Transitions of $3{\rightarrow}1$ and $2{\rightarrow}1$ eddy flow occur with decrease of Rayleigh number. However, reverse transitions of $1{\rightarrow}3$ and $1{\rightarrow}2$ eddy flow do not occur with increase of Rayleigh number, and no hysteresis phenomenon is observed. In the regime of triple solutions, the 3 eddy flow has the largest mean Nusselt number value and the 1 eddy flow has the smallest value.

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참고문헌

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