| 摘要 |
PURPOSE:To enable the reaction of a stock material in a condensed and uniformized state and to improve the utilization efficiency of the stock material and the yield of a reaction product, by constituting a reaction apparatus by forming a reaction area in a contraction and expansion nozzle. CONSTITUTION:A stock material is supplied to an upstream chamber 3 from a supply port while air in a downstream chamber 4 is exhausted from an exhaust port 7 by a vacuum pump. Whereupon, pressure difference is generated between the upstream chamber 3 and the downstream chamber 4. Therefore, the supplied stock material flows through a contraction and expansion nozzle 1 from the upstream chamber 3 to be flowed into the downstream chamber 4. The contraction and expansion nozzle 1 can increase the flow speed of the stock material by regulating the pressure difference between the pressure Po of the upstream chamber 3 and the pressure P of the downstream chamber 4 and the ratio of the open are A' of a throat part 2 and the open area A of an outflow port 1b. If P/Po is larger than a critical pressure ratio, the outlet flow speed of the contraction and expansion nozzle comes to a subsonic speed and the stock material is ejected at a reduced speed. |
