Pressure Loss across Tube Bundles in Two-phase Flow

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 40, Issue 3, 2016, pp.181-189
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.3795/KSME-B.2016.40.3.181

Title & Authors

Pressure Loss across Tube Bundles in Two-phase Flow

Sim, Woo Gun; Banzragch, Dagdan;

Sim, Woo Gun; Banzragch, Dagdan;

Abstract

An analytical model was developed by Sim to estimate the two-phase damping ratio for upward two-phase flow perpendicular to horizontal tube bundles. The parameters of two-phase flow, such as void fraction and pressure loss evaluated in the model, were calculated based on existing experimental formulations. However, it is necessary to implement a few improvements in the formulations for the case of tube bundles. For the purpose of the improved formulation, we need more information about the two-phase parameters, which can be found through experimental test. An experiment is performed with a typical normal square array of cylinders subjected to the two-phase flow of air-water in the tube bundles, to calculate the two-phase Euler number and the two-phase friction multiplier. The pitch-to-diameter ratio is 1.35 and the diameter of cylinder is 18mm. Pressure loss along the flow direction in the tube bundles is measured with a pressure transducer and data acquisition system to calculate the two-phase Euler number and the two-phase friction multiplier. The void fraction model by Feenstra et al. is used to estimate the void fraction of the two-phase flow in tube bundles. The experimental results of the two phase friction multiplier and two-phase Euler number for homogeneous and non-homogeneous two-phase flows are compared and evaluated against the analytical results given by Sim`s model.

Keywords

Two-phase Flow;Two-phase Friction Multiplier;Euler number;

Language

Korean

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