THE TRANSIENT BOILING HEAT TRANSFER PROCESS FROM NATURAL CONVECTION OR NUCLEATE BOILING TO FILM BOILING CAUSED BY A RAPID PRESSURE REDUCTION
作者单位：Department of Nuclear Engineering Kobe University of Mercantile Marine Kobe Institute of Advanced Energy Kyoto University Uji Department of Energy Science and Technology Kyoto University Uji Professor Emeritus of Kyoto University Kyoto University
会议名称：《CSPE-JSME-ASME International Conference on Power Engineering》
会议日期：2001年
学科分类：080701[工学-工程热物理] 08[工学] 0807[工学-动力工程及工程热物理]
摘 要：Transient boiling process caused by exponentially decreasing system pressure from an initial high pressare toatmospheric on a horizontal test cylinder in a pool of water with the temperature of 373 K with an initial heat flux in naturalconvection or in nucleate boiling in a pool of water with the temperature of 373 K was measured for the independent valuablessuch as initial pressures of 1.08 and 1 .57 MPa, for initial heat fluxes ranging from 0.2 to 0.8 MW/m, exponential reductionperiods ranging from 1 to 25 ms, and the cylinder diameters of 1.2 and 3 mm. The finally reaching boiling regimes after thepressure reduction were nucleate boiling regime for initial low heat nux and film boiling for initial intermediate and high hcafluxes;though before reaching stable film boiling, the heating DC current was cut off to avoid real burnout of the test *** was found tha there exist different characteristics of transient boiling processes Which finally reached in nuclcate boiling orfilm boiling regime depending on the low, intermediate and high subcoolings caused by rapid system pressure *** of initial heat fluxes, initial pressures and test cylinder diameter on the transient boiling process are investigated for thedatabase of the safety assessment for the design of heat exchanger in the cooling system of high heat flux components.