Abo Bibliothek: Guest

ISSN Online: 2377-424X

International Heat Transfer Conference 3
August, 7-12, 1966, Chicago, USA

DIFFERENTIAL EQUATIONS FOR THE LOCAL INTERFACIAL AND WALL SHEAR STRESSES FOR ONE-DIMENSIONAL ANNULAR TWO-PHASE FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC3.460
pages 167-177

Abstrakt

The analytical determination of the local flow mechanics of a high velocity vapor condensing on the inside wall of a straight tube requires knowledge of the magnitude of the local interfacial shear stress, and also the wall shear stress. In this paper the differential equations of momentum, for high speed, steady, one-dimensional, annular, condensing flow in a straight tube, have been derived. These one-dimensional, non-linear, ordinary differential equations are written so as to give an explicit representation of the local interfacial vapor shear stress and also the local shear stress of the annular liquid layer at the tube wall. Local interfacial and wall friction factors are defined and both functions are evaluated by use of experimental data on the local flow properties of condensing steam. The variation of both friction factors over the length of a condensing tube is shown, for steam condensing at very high velocities-up to 1,800 feet per second.