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Analysis of mixing characteristics of flow in a jet pump using a finite-difference method

Authors
Journal
The Chemical Engineering Journal
0300-9467
Publisher
Elsevier
Publication Date
Volume
39
Issue
2
Identifiers
DOI: 10.1016/0300-9467(88)80100-x
Disciplines
  • Design

Abstract

Abstract The flow analysis and design of jet pumps were until now mostly based purely on experiments and simple theories developed from energy and momentum balances. In this paper a more detailed analysis is presented, based on the Patankar—Spalding, finite-difference method which has been modified to predict two-dimensional axisymmetric jet pump flows. The solution is obtained by means of a marching-integration technique using an implicit scheme and integration over a micro-control volume. The analysis explains some details of the mixing between the two fluid streams involved, and facilitates determination of the optimum length of the mixing tube for a specified inlet condition. Predictions have been made and compared with experimental data pertaining to the centre-line velocity decay, wall static-pressure variation and axial velocity profiles for the mixing of both air and water streams, inside a constant-diameter duct. The theoretical predictions compare well with the experimental data and thus facilitate determination of the optimum mixing-tube length.

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