Condensation of saturated vapor on melting surfaces

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6482271

Taghavi-Tafreshi, K

Melting of vertical and horizontal surfaces as a result of condensation of saturated vapor was studied. For the vertical wall, employing similarity transformation, full boundary layer equations governing laminar films of melt and condensate were obtained. Depending on the magnitude of the Prandtl number, different scaling parameters are needed such that Pr appears in the momentum or energy equation. Numerical results of the heat transfer coefficient and for the meltcondensate interface temperature were obtained for a wide range of thermophysical properties of the melt and the condensate. Application of the results to condensation of UO/sub 2/ vapor on vertical surfaces of steel is discussed. However, in doing so the heat generation in UO/sub 2/ was ignored. Experiments were conducted by condensing saturated steam on vertical surfaces of slabs made of naphthalene, biphenyl, stearic acid, and Wood's metal. Shape change of an initially vertical surface undergoing simultaneous melting-condensation was studied both analytically and experimentally. It was shown that such a surface will not stay vertical and will go through a series of transient shapes before attaining a steady stare shape. Numerical solutions are obtained both for the transient shapes of the wall and the heat transfer coefficient. The steady state shape of the wall is predicted to be the one which yields a constant melting rate along the wall. The heat transfer and shape change data obtained by condensing saturated steam on vertical surfaces of slabs made of naphthalene, biphenyl, and stearic acid were compared with the predictions. For the condensation on the downward facing horizontal melting surface, analyses for the heat transfer coefficient were made by invoking an analogy with simultaneous melting-condensation on vertical surfaces.

• OSTI ID: 6482271
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ACTINIDE COMPOUNDS
ALLOYS
CHALCOGENIDES
ENERGY TRANSFER
HEAT TRANSFER
IRON ALLOYS
IRON BASE ALLOYS
MELTING
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRANDTL NUMBER
STEAM
STEELS
SURFACES
THERMODYNAMIC PROPERTIES
URANIUM COMPOUNDS
URANIUM DIOXIDE
URANIUM OXIDES
VAPOR CONDENSATION