CALCULATION OF PRESSURE DROP IN NARROW ROTATING ANNULAR CLEARANCES | Zendy

Celso Yukio Nakashima | Zendy; Silvio de Oliveira | Zendy; E. F. Caetano | Zendy

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CALCULATION OF PRESSURE DROP IN NARROW ROTATING ANNULAR CLEARANCES

Author(s) -

Celso Yukio Nakashima,

Silvio de Oliveira,

E. F. Caetano

Publication year - 2008

Publication title -

revista de engenharia térmica

Language(s) - English

Resource type - Journals

ISSN - 1676-1790

DOI - 10.5380/reterm.v7i2.61756

Subject(s) - backflow , mechanics , pressure drop , laminar flow , vortex , turbulence , drop (telecommunication) , rotation (mathematics) , spinning drop method , materials science , physics , mathematics , engineering , mechanical engineering , geometry , inlet

This paper presents a review of correlations used for pressure drop calculation in narrow annular clearances with rotation of inner cylinder. Based on these review, a new general correlation is proposed to calculate pressure drop through such clearances. Results are compared with experimental data for different flow regimes: laminar, laminar with Taylor vortex, smooth and rough turbulent, with good agreement. The main objective is to develop a simple and general correlation that could be used for backflow calculation in twin-screw multiphase pumps. In this kind of pump, the volumetric efficiency is defined mainly by the backflow rate which occurs in the annular clearance between screw and casing. Usually, the backflow is calculated ignoring the influence of shaft rotation over pressure drop and does not consider the several possible flow regimes. Depending on operational conditions, this simplification can lead to significant errors.

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