Theoretical study of laminar film condensation on horizontal elliptical tubes under conditions of free and forced convection
Adams, Vance Hiro
Marto, Paul J.
Memory, Stephen B.
MetadataShow full item record
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.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Powell, Jonathan D. (Monterey, California. Naval Postgraduate School, 2005-06);This thesis presents a Computation Fluid Dynamics (CFD) analysis of the aerodynamic performance of circular and elliptical leading edges of compressor blades, with a range of leading-edge droop angles. Specifically, ...
Kaplan, Ali (Monterey, California. Naval Postgraduate School, 1980-09);Repeatable accuracy of hydrographic positioning was examined in terms of the two-dimensional normal distribution function which results in an elliptical error figure. The error ellipse was discussed, and two methods for ...
An investigation of an expanding elliptical earth escape trajectory for a low thrust space vehicle Drews, Sheldon; Goldner, Robert Reilly; Treiber, Arthur Edgar (Cambridge, Massachusetts; Massachusetts Institute of Technology, 1961-06-01);This thesis studies the advantages and disadvantages of an expanding elliptical acceleration maneuver for a space vehicle, in chic a low level acceleration is applied tangentially for small arcs of true anomaly centered ...