Accession Number : AD0612248

Title :   ON THE OSCILLATORY BEHAVIOR OF NATURAL CIRCULATION SYSTEMS.

Descriptive Note : Master's thesis,

Corporate Author : OKLAHOMA UNIV NORMAN

Personal Author(s) : Lauderdale,Charles George

Report Date : 1965

Pagination or Media Count : 46

Abstract : The data observed and recorded lead to the following conclusions regarding the behavior of the natural circulation loop studied. (1) With no cooling flow in the downcomer coils and for a given power input, the larger the restricting orifice in the downcomer the more stable the flow in the loop. (2) With minimum cooling flow - that required to maintain the riser fluid at a p point just below its boiling temperature - and for a given power input, the smaller the restricting orifice the more stable the flow in the loop. (3) For a given power input, the smaller the restricting orifice in the downcomer the larger the difference in temperature between inlet and outlet to the heater. (4) Injecting air in the form of bubble streams at the bottom of the riser has been shown to have a subduing effect on oscillations peculiar to a natural circulation loop, and to allow the fluid to operate in a narrower range of temperatures of inlet and outlet. (5) The luminescent effect observed in the riser immediately before boiling requires a minimum though unknown amount of light incident on the riser tube. The effect was also observed to be pressuredependent. ((Author)

Descriptors :   (*FLUID FLOW, OSCILLATION), (*MECHANICAL ENGINEERING, NUCLEATE BOILING), (*NUCLEATE BOILING, OSCILLATION), POWER, TEMPERATURE, LUMINESCENCE, HIGH SPEED PHOTOGRAPHY

Distribution Statement : APPROVED FOR PUBLIC RELEASE