Experimental study on Effects of Spacers on Natural Convection from a Horizontal Annulus

수평환상공간(水萍環狀空間)의 자연대류(自然對流)에서 격판(隔板)의 영향에 관한 실험적(實驗的) 연구(硏究)

Natural convection in a horizontal annulus with spacers has been studied on the effects of diameter ratio and Rayleigh numbers and position of spacers by experimental method. In case of vertical spacers, the local spacer Nusselt numbers show positive values on the lower spacer, but negative values on the upper spacer. In case of horizontal spacers, the local spacer Nusselt numbers show positive values on the upward surface of spacer, but negative values on the downward surface of spacer. The mean tube Nusselt numbers and mean cylinder Nusselt numbers with vertical spacer are increased 10% and 2.1%, respectively by those of horizontal spacer.