Accession Number : ADA119338

Title :   Effects of Condensate Inundation and Vapor Velocity on Heat Transfer in a Condenser Tube Bundle.

Descriptive Note : Master's thesis,


Personal Author(s) : Noftz,Paul Jeffrey

Full Text :

Report Date : Jun 1982

Pagination or Media Count : 190

Abstract : A five-tube column test condenser was modified to facilitate easier tube removal and installation and to allow for the simulation of larger depth tube bundles. Heat transfer coefficients were then determined for sixty-two runs conducted at steam supply pressures of 35, 40, 45, and 50 psig with the system operated at test condenser pressures of approximately 2 and 15 psia. Each run was five minutes long with temperature, pressure, and flow rate data taken at one minute intervals. The results revealed that the average tube wall temperature and the heat transfer coefficients for a given tube of a tube bundle increased as the mean vapor velocity increased, but decreased as the amount of condensate inundation increased. The experimentally obtained values for the heat transfer coefficients were compatible with the Nusselt predictions for the runs conducted at 15 psia, but greatly exceeded the Nusselt predictions for the runs conducted at 2 psia. However, for the 2 psia runs, the heat transfer coefficients for the top tubes agreed closely with an experimental correlation proposed by Fujii. The simulation of a tube bundle of more than five active tubes per column at the 2 psia test condenser pressure demonstrated heat transfer coefficients closer to the Nusselt theory than when only five active tubes were considered.

Descriptors :   *Heat transfer , *Condenser tubes , *Condensation , Heat transfer coefficients , Flow rate , Simulation , Test equipment , Pressure , Steam , Theses , Vapors , Velocity , Mean

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE