Filmwise Condensation of Steam on Externally-Finned Horizontal Tubes.

reportActive / Technical Report | Accession Number: ADA136967 | Open PDF

Abstract:

The film-condensation characteristics of a smooth tube and six externally-finned tubes having fins 1 mm high and 1 mm thick, and ptiches of 1.5, 2.0, 2.5, 3.0, 5.0, and 10.0 mm, were experimentally tested. A smooth copper tube with an active length of 133.5 mm, an outside diameter of 19.05 mm, and an inside diameter of 12.7 mm was first tested to correlate the inside heat-transfer coefficient using the Sieder-Tate equation. The leading coefficient for this equation was found to be 0.034 or - 0.001, and was used to derive the external condensing coefficient for all of the tubes by subtracting the inside and wall resistances from the measured overall resistance. The condensing coefficient was measured, both at atmospheric pressure and vacuum 84 mm hg, with the heat flux as a variable. Condensation data taken for the smooth tube were compared with data in the literature to check the reliability of the apparatus and the data-reduction procedures. The data for the finned tubes showed an optimum pitch of 2.5 mm. Author

Author(s):
Poole, W. M.
Author Organization(s):
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Descriptive Note:
Master's thesis,
Pagination:
0086

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NPS69-83-003
Contract/Grant Number(s):
NSF-MEA82-03567
 Subject Terms
Joint Capability Areas:
JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_1_Force Support; JCA_4.6_Engineering; JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_4.6.1_General Engineering; JCA_1.2_Force Preparation; JCA_1.2.3_Educating; JCA_4_Logistics; JCA_3.2_Engagement; JCA_3_Force Application
Modernization Areas:
Microelectronics
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*Heat transfer, *Condenser tubes, *Steam condensers, *Fins, External, Walls, Heat transfer coefficients, Internal, Steam turbines, Marine surface propulsion, Heat flux, Films, Vacuum apparatus, Condensation, Copper, Horizontal orientation, Data reduction, Computer programs, Theses
Field(s)/Group(s):
Marine Engineering, Thermodynamics
Keyword(s):
Surface ships, Filmwise condensation, Finned condenser tubes, Sieder Tate coefficient
Report Date:
1983 Dec 01