Accession Number : ADP008937

Title :   Investigation of Interfacial Drag with Pulsed Laser Velocimetry,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION

Personal Author(s) : Hassan, Yassin A. ; Blanchat, Thomas K.

Report Date : 23 JUL 1992

Pagination or Media Count : 5

Abstract : Experimental investigation of a two-phase, horizontal stratified, flow regime was performed using Pulsed laser Velocimetry (PLV) techniques to determine the interface drag force, and correspondingly, the drag coefficient. A horizontal, stratified flow test facility using water and air was constructed to measure the interface shear with PLV techniques. A dynamic, binary, spatial, cross correlation tracking method, requiring only two sequential camera images, was used to analyze the PLV data. The experimentally obtained local drag measurements were compared with theoretical results given by conventional interfacial drag theory. Close agreement was shown when local conditions near the interface were similar to space averaged conditions. However, theory based on macroscopic, space-averaged flow behaviour was shown to give incorrect results if the local gas velocity near the interface was unstable, transient, and dissimilar from the average gas velocity through the test facility. (Author)

Descriptors :   *LASER VELOCIMETERS, *TWO PHASE FLOW, BOUNDARY LAYER FLOW, AERODYNAMIC DRAG, CROSS CORRELATION, STRATIFICATION, SHEAR STRESSES, OPTICAL TRACKING, INTERFACES.

Subject Categories : Optical Detection and Detectors
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE