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등온으로 가열되는 경사진 평판위를 흐르는 자연대류의 열적 불안정성
Thermal Instability of Natural Convection over Inclined Isothermally Heated Plates
HWAHAK KONGHAK, June 1991, 29(3), 381-387(7), NONE
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Abstract
등온으로 가열되는 경사진 평판위의 층류 자연대류 유동에서 2차적인 정규 와동의 바라생조건을 이론적으로 조사하였다. 본 연구를 위하여 선형 안전성 이론과 크기위수 해석을 근거로 교란량들의 주 흐름방향의 변화를 고려하는 전파이론이 적용되었다. Prandtl수가 매우 큰 극한 경우에 대하여 임계 조건을 구하여 본 결과, 그 임계 조건은 기존의 연구결과들보다 물에 대한 실험치에 보다 접근함을 보였다.
A theoretical study for analyzing onset conditions of secondary flow in the form of vortex rolls in the primary natural convection over an inclined isothermally heated plate is carried out by employing the order-of-magnitude analysis under linear stability theory. For this purpose the propagation theory consid-ering the variation of disturbances in the main flow direction is tested here. The present critical conditions for the infinite Prandtl number are found to approach the experimental data of water more closely than other theoretical results.
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