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一、热对流的影响以及向蒸发面的贴附水平吹出的平面射流(见图1),当其下方受到由热对流而产生的上升气流作用时,射流轴线呈圆弧形弯曲。其曲率半径用式(1)计算(符号见图1)。 R/A_0=u_0~2/9.8h((t_0+273)/Δt+1) (1) 式中 R——曲率半径,米; h——从液面到吹出口的高度,米; t_0——室温,℃; Δt——热气流温度与室温的差值,℃; A_0——射流吹出口的厚度。当离吹出口距离为L处的射流的弯曲程度取为x_h时,Z=L/R及x=x_h/R的关系可由式(1)求出,并如图2所示。
First, the effect of heat convection and the plane jet blown to the evaporating surface (see Figure 1), when the lower surface is subjected to the upward flow caused by heat convection, the axis of the jet bends in a circular arc. Its radius of curvature is calculated using equation (1) (symbols are shown in Figure 1). R/A_0=u_0~2/9.8h((t_0+273)/Δt+1) (1) where R is the radius of curvature, m; h is the height from the liquid surface to the blowout outlet, and t_0— - Room temperature, °C; Δt - difference between the temperature of the hot gas stream and room temperature, °C; A_0 - the thickness of the jet outlet. When the bending degree of the jet at a distance L from the blowout outlet is taken as x_h, the relationship of Z=L/R and x=x_h/R can be obtained from the equation (1), and as shown in FIG. 2 .