Università degli Studi di Udine OpenUniud - Archivio istituzionale delle tesi di dottorato

OpenUniud - Archivio istituzionale delle tesi di dottorato >
Udine Thesis Repository >
01 - Tesi di dottorato >

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10990/623

Autori: Pitton, Enrico
Supervisore afferente all'Università: SOLDATI, ALFREDO
Titolo: The tracer method and conductance probes to study stratified-dispersed flows in near horizontal pipes
Abstract (in inglese): The tracer method has been adopted to study stratified-dispersed flow in a horizontal pipe, 80 mm in diameter and 50 m long, operating at 5 Bar with nitrogen-water mixtures. The use of the tracer method in a horizontal pipe required the development of a specially designed test section, the related electronics and a data acquisition system. The test section consists of a short pipe made of a non-conducting material installed in a flow rig designed to operate at an appreciable pressure (40 Bar). The flow loop is made of metallic pipes connected to the electrical ground. The conductance probes are made of three parallel, rigid wires spaced along the flow direction and have been used to measure the height or the electrical conductivity of the liquid layer. The three-electrode geometry is aimed at minimizing current losses toward ground. The simultaneous operation of all the probes of the array, without multiplexing, allows a substantial reduction of current dispersion and a good circumferential resolution of film thickness or conductivity measurements. The probe geometry may generate an appreciable disturbance to the gas-liquid interface. This aspect of the proposed method has been studied with an experimental and numerical investigation relative to free falling liquid layers. It has also been necessary to develop a tracer injection system, which has been designed in order to obtain uniform tracer concentration in the liquid film immediately after its injection. The main flow parameters which can be measured with the present experimental set-up are the circumferential distribution of the film height, flow rate and tracer concentration, the rates of droplet entrainment and deposition and the split of the liquid phase between the wall layer and the entrained droplets. The average tracer concentration data have been interpreted with a new three-field model of the liquid phase in the stratified-dispersed flow pattern. In the present formulation, the model holds for steady, fully developed flow conditions and is based on a one-dimensional description of the flow system. The data cover a limited number of flow conditions
Parole chiave: Multiphase flow; Wet gas; Conductance probe; Stratified-dispersed flow; Horizontal pipe; Tracer method
MIUR : Settore ING-IND/06 - Fluidodinamica
Lingua: eng
Data: 10-apr-2015
Corso di dottorato: Dottorato di ricerca in Tecnologie chimiche ed energetiche
Ciclo di dottorato: 26
Università di conseguimento titolo: Università degli Studi di Udine
Luogo di discussione: Udine
Altre informazioni: Co-supervisor: Marina Campolo - Struttura di aggregazione: TEA Sistemi spa (spin-off of the University of Pisa)
Citazione: Pitton, E. The tracer method and conductance probes to study stratified-dispersed flows in near horizontal pipes. (Doctoral Thesis, Università degli Studi di Udine, 2015).
In01 - Tesi di dottorato

Full text:

File Descrizione DimensioniFormatoConsultabilità
PittonPhdThesis.pdfPhD Thesis10,46 MBAdobe PDFVisualizza/apri

Tutti i documenti archiviati in DSPACE sono protetti da copyright. Tutti i diritti riservati.

Segnala questo record su




Stumble it!



  ICT Support, development & maintenance are provided by CINECA. Powered on DSpace SoftwareFeedback CINECA