Gas-Liquid Horizontal Flow

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Presentation transcript:

Gas-Liquid Horizontal Flow José L.H. Faccini and Paulo A.B. Sampaio Instituto de Engenharia Nuclear CNEN Brazil Jian Su Nuclear Engineering Program, COPPE Universidade Federal do Rio de Janeiro Brasil PASI 2007, August 2007, Mar del Plata, Argentina

Collaborators Prof. Jen-Shih Chang, McMaster Prof. Glenn Harvel, Univ Ontario Inst Tech Tatiana Masala, AECL Dr. Carlos Lamy, IEN/CNEN Jurandyr Cunha de Souza, COPPE/UFRJ

Gas-liquid two-phase stratified and intermittent horizontal flow using ultrasonic and high-speed visualization techniques

(Hewitt, Nuclear Eng. Design, 2005)

Two-Phase Flow – Steady State Operation Steady state operation of two-phase flow in pipes means that the flow rate of the fluids (gas and liquid) are constant; As a result, the conditions at any point in the pipe remains constant: the flow pattern, average void fraction, average pressure drop and average local flow rates do not vary with time; two flow seldom is a truly steady state flow and averaging values are used over a time period characteristic of the flow pattern.

Gas-Liquid Vertical Flow

Gas-Liquid Horizontal Flow

Flow Regime Map

Definition of Basic Parameters Void fraction and liquid holdup Gas and liquid superficial velocities Gas and liquid (phase) velocities Volumetric fraction or nonslip holdup

Experimental Techniques Interfering Steady State Slow transient Fast Transient Flow Regime Local Void fraction Averaged Void fraction Void fraction distribution Phase Velocity Conductance Yes No Limited Capacitance Optical techniques Gamma ray Need Strong Source X-ray Neutron Radiography Ultrasonic Masala (2004)

Gas-Liquid Horizontal Flow Rig

Experimental flow regimes

Experimental Setup

Experimental Setup

Doppler Flowmeter Doppler ultrasonic flowmeters operate on the Doppler effect, whereby the transmitted frequency is altered linearly by being reflected from particles and bubbles in the fluid. The net result is a frequency shift between transmitter and receiver frequencies that can be directly related to the flow rate.

Transit Time/Transmission Technique

Pulse-Echo Technique Chang et al. (1982) e Morala e Chang (1986).

Ultrasonic Techniques Dia:12/11/05 Hora:18:01:35 Valores Observações 3,949E-5Arquivo escoamento_ST_000.txt 3,924E-5Arquivo escoamento_ST_001.txt 3,928E-5Arquivo escoamento_ST_002.txt 7,444E-5Arquivo escoamento_ST_003.txt 3,932E-5Arquivo escoamento_ST_004.txt 3,994E-5Arquivo escoamento_ST_005.txt

Ultrasonic Techiques

Liquid level measurement calibration

Liquid thickness in stratified flow

Gas-liquid horizontal flow setup (McMaster)

Ultrasonic System for Two-Phase Flow CS12100 Card Winspect Software Motor Controller DMC 1800 Multiplexer … 1 4 2 UG 3 UL Transducers PC Masala (2004), Masala, Harvel, Su, Chang (2007)

Slug flow

Plug flow

Visualization System

Smooth Stratified Flow

Wavy Stratified Flow

Plug Flow

Slug Flow

An elongated bubble

Plug front and tail velocity – Ultrasonic measurement

Bubble nose and tail velocity - Visualization

CNPq, FAPERJ, CAPES of Brazil PASI 2007 Organizers Acknowledgement CNPq, FAPERJ, CAPES of Brazil PASI 2007 Organizers Thank you for attention.