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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

TWO PHASE FLOW VISUALIZATION IN EVAPORATOR TUBE BUNDLES USING EXPERIMENTAL AND NUMERICAL TECHNIQUES

Steven J. Eckels
Department of Mechanical and Nuclear Engineering, Kansas State University, Manhattan KS 66506

Jason Schlup
Kansas State University, Manhattan, KS 66506, USA

Abstract

Experimental and numerical investigations of two-phase flow patterns in a staggered tube bundle are performed. R-134a is the working fluid in both the experimental and computational fluid dynamics (CFD) analysis. Enhanced staggered tube bundles are studied experimentally using a 1.167 pitch to diameter ratio. The experimental tube bundles and CFD geometry consist of 20 tubes with five tubes per pass. High speed video is recorded during the experimental bundle boiling. Bundle conditions range in mass fluxes from 10-35 kg/(m2 s) and inlet qualities from 0-70% with a fixed heat flux. Classification of the flow patterns from these videos is performed using flow pattern definitions from literature. Examples enhanced bundle boiling high speed videos are given through individual images. The flow patterns are plotted and compared with an existing flow pattern map. Good agreement is found for the enhanced tube bundle. Adiabatic numerical simulations are performed with wall boundary conditions at the side walls. The two-phase volume of fluid method is used to construct vapor interfaces and measure vapor volume fraction. A probability density function (PDF) technique is applied to the results to determine flow patterns from the simulations using statistical parameters. Flow patterns are plotted on an adiabatic flow pattern map from literature and excellent agreement is found between the two. The agreement between simulation results and experimental data from literature suggests numerical simulations can be used for tube bundle design.

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