Brunel University Research Archive (BURA) >
Schools >
School of Engineering and Design >
School of Engineering and Design Research papers >

Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/3206

Title: The effect of tube diameter on vertical two-phase flow regimes in small tubes
Authors: Chen, L
Tian, YS
Karayiannis, TG
Keywords: Boiling
Test facilities
Experimental study
Circular pipe
Capillary tube
Vertical pipe
Refrigerant fluid
Flow regime
Two-phase flow
Publication Date: 2006
Publisher: Elsevier
Citation: International Journal of Heat and Mass Transfer, 49(21-22): 4220-4230
Abstract: Flow boiling flow patterns in four circular tubes with internal diameters of 1.10, 2.01, 2.88 and 4.26 mm were investigated in the present project. The experiments were conducted in vertical upward two-phase flow using R134a as the working fluid. The observed flow patterns include dispersed bubble, bubbly, confined bubble, slug, churn, annular and mist flow. The flow characteristics in the 2.88 and 4.26 mm tubes are similar to those typically described in normal size tubes. The smaller diameter tubes, 1.10 and 2.01 mm, exhibit strong "small tube characteristics" as described in earlier studies. The sketched flow maps show that the transition boundaries of slug-churn and churn-annular depend strongly on diameter. On the contrary, the dispersed bubble to churn and bubbly to slug boundaries are less affected. The transition boundaries are compared with existing models for normal size tubes showing poor agreement.
URI: http://bura.brunel.ac.uk/handle/2438/3206
ISSN: 0017-9310
Appears in Collections:School of Engineering and Design Research papers
Mechanical Engineering

Files in This Item:

File Description SizeFormat
The Effect of Tube Diameter on Vertical Two-phase Flow Regimes in Small Tubes.pdf1.03 MBAdobe PDFView/Open

Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.

 


Library (c) Brunel University.    Powered By: DSpace
Send us your
Feedback. Last Updated: September 14, 2010.
Managed by:
Hassan Bhuiyan