Tipo di tesi
Tesi di laurea magistrale
Titolo
VOID FRACTION DETECTION WITH A MICRO OPTICAL PROBE INSIDE CAPILLARY CHANNELS FOR THERMAL MANAGEMENT IN SPACE
Dipartimento
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA AEROSPAZIALE
Parole chiave
- camera
- capillary
- circulator
- cocurrent
- flow
- high
- labview
- laser
- matlab
- optic
- optical
- phase
- photodiode
- probe
- speed
- Two
- upward
Data inizio appello
23/11/2021
Consultabilità
Non consultabile
Data di rilascio
23/11/2091
Riassunto (Italiano)
This study examines the results of void fraction measurements in a two-phase flow inside a capillary channel by means of an optical probe. The purpose of such research is to assess the reliability of the optical measurement technique for two different fiber shapes, a conical lens and a 90° lens.
The optic probes are tested in a vertical pipe in which an upward co-current gas-liquid flow was stimulated through a pump and a syringe. The probe signal was detected by a photodiode and implemented by a control hardware, Crio. The output signal was analysed and post-processed with a Matlab script. A high-speed camera, Ximea xiQ, was used to compare the fiber signal output with a digital camera signal, obtained by the post-process of the photo-sequences.
Excellent results were obtained regarding the probe capability to detect the local void fraction and its accuracy, still it was not possible to evaluate any analytic velocity relationship.
