Theoretical study of laminar film condensation on horizontal elliptical tubes under conditions of free and forced convection
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Authors
Adams, Vance Hiro
Subjects
Laminar film condensation
Horizontal elliptical tube
Free and forced convection
Horizontal elliptical tube
Free and forced convection
Advisors
Marto, Paul J.
Memory, Stephen B.
Date of Issue
1993-03
Date
March 1993
Publisher
Monterey, California: Naval Postgraduate School
Language
en_US
Abstract
Analytical studies have been made of laminar film condensation on a horizontal elliptical cylinder in a pure saturated vapor under conditions of free and forced convection. Estimation of interfacial shear stress was made in two ways: the first involving an asymptotic value of the shear stress under condition of infinite condensation rate and the second based on simultaneously solving the two-phase vapor boundary layer and condensate equations. the latter approach enables the determination of the vapor boundary layer separation point. For the assumption of asymptotic shear stress, effects of surface tension and pressure gradient in the condensate film have also been included. At the extremes of eccentricity, corresponding to a circular tube and a vertical flat plate, the results are compared with theoretical and experimental work of others. Improvement in the condensation heat transfer coefficient was found for elliptical tubes under both free and forced convection conditions when comparec to circular tubes of the same surface area. In the latter case, this improvement was due mainly to the reduced drag of the elliptical tube providing a higher vapor velocity for the same pressure drop as that across a circular tube.
Type
Thesis
Description
Series/Report No
Department
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
111 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.