Local condensation rates in nearly horizontal stratified countercurrent flow of steam and cold water

Journal Article · Sat Jan 01 04:00:00 EST 1983 · AIChE Symp. Ser.; (United States)

OSTI ID:5384870

Bankoff, S G; Kim, H J

Local condensation heat transfer coefficients have been measured for countercurrent stratified flow of steam and cold water at atmospheric pressure in a flat plate geometry at an inclination of 4/sup 0/ from the horizontal with aspect ratio 5/1. Pressure gradients are also measured which allow the calculation of local interfacial shear stresses. In addition, interfacial wave structures are measured locally by means of contact probes, from which wave frequencies and spectral analyses can be deduced. The data are correlated in terms of the gas and liquid Reynolds numbers and the Prandti number for the Nusselt number. A simple correlation for the interfacial shear stress and the pressure gradient has been developed and compared with the measured values, resulting in good agreement. The mean water layer thicknesses were calculated by assuming a linear shear stress distribution in the liquid layer, using the von Karman mixing length hypothesis, and compared with the experimental data. A turbulence-centered model is also modified, based upon the interfacial parameters for the turbulent velocity and length scales, giving good agreement with the data.

• Research Organization: Chemical Engineering Department, Northwestern University, Evanston, IL
• OSTI ID: 5384870
• Journal Information: AIChE Symp. Ser.; (United States), Journal Name: AIChE Symp. Ser.; (United States) Vol. 79:225; ISSN ACSSC
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ENERGY TRANSFER
FLUID FLOW
HEAT TRANSFER
HYDROGEN COMPOUNDS
KINETICS
NUSSELT NUMBER
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
PRANDTL NUMBER
PRESSURE GRADIENTS
REYNOLDS NUMBER
SHEAR
STEAM
TURBULENCE
TWO-PHASE FLOW
VAPOR CONDENSATION
WATER