A Correlation in Displacement Velocity of Liquid Film Boundary formed on a Heated Vertical Surface in Emergency Cooling

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概要

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• Intense ebullition occurs at the liquid front heading a falling sheet of water over a heated vertical surface, as in the case of emergency cooling. It has been ascertained that the displace-ment velocity of this liquid front is nearly constant for the values of specified parameters such as wall temperature before cooling, flow rate of cooling liquid, and the physical properties of heated wall and cooling liquid. Observations were conducted on the liquid front velocity using a heated wall of stainless-steel and with tap water as cooling liquid. An analysis has been made on the basis of a two-dimensional transient heat conduction model, the result of which proves to be valid for explaining the liquid front behavior when account is taken of boiling heat transfer. The liquid front velocity is given by<BR>where N denotes a reference state. The above relation is applicable in the region of flow rate from 0.245 kg/m • sec to 2.45 kg/m • sec.

• 一般社団法人 日本原子力学会の論文

著者

• Hasegawa Shu

  Department Of Neurosurgery Kumamoto Red Cross Hospital:department Of Neurosurgery Kumamoto Universit

• YOSHIOKA Keisuke

  Department of Nuclear Engineering, Kyushu University

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