Abonnement à la biblothèque: Guest
Portail numérique Bibliothèque numérique eBooks Revues Références et comptes rendus Collections
Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

Volumes:
Volume 26, 2019 Volume 25, 2018 Volume 24, 2017 Volume 23, 2016 Volume 22, 2015 Volume 21, 2014 Volume 20, 2013 Volume 19, 2012 Volume 18, 2011 Volume 17, 2010 Volume 16, 2009 Volume 15, 2008 Volume 14, 2007 Volume 13, 2006 Volume 12, 2005 Volume 11, 2004 Volume 10, 2003 Volume 9, 2002 Volume 8, 2001 Volume 7, 2000 Volume 6, 1999 Volume 5, 1998 Volume 4, 1997 Volume 3, 1996 Volume 2, 1995 Volume 1, 1994

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v16.i4.20
pages 331-350

Density-Wave Flow Oscillations in a Water Boiling Horizontal Tube with Inserts

Sendogan Karagoz
Department of Mechanical Engineering, Ataturk University, TR-25240 Erzurum, Turkey
Suleyman Karsli
Department of Mechanical Engineering, Faculty of Engineering, Ataturk University, TR-25300 Erzurum, Turkey
Mehmet Yilmaz
Department of Mechanical Engineering, Faculty of Engineering, Ataturk University, Turkey
Omer Comakli
Department of Mechanical Engineering, Ataturk University, TR-25240 Erzurum, Turkey

RÉSUMÉ

Density-wave type oscillations are one of the main types of two-phase flow dynamic oscillations frequently encountered in industrial thermal-hydraulic systems. These oscillations are caused by the dynamic interaction between flow rates, density distribution, and pressure drop distribution within the system, and are high-frequency oscillations. To avoid or control density-wave oscillations is of vital importance for two-phase systems, since they can induce thermal oscillations, accelerating the thermal fatique of the tube and finally resulting in burnout damage. In this study, an experimental investigation on two-phase flow density-wave type instabilities in a horizontal pipe with inserts was conducted. Four different heat transfer surface configurations containing one bare tube and three different enhancement inserts were used. The point on the characteristic curve, where pure density-wave oscillations started, changed with the tube configurations. This point was near the middle of the characteristic curve for the smooth tube, whereas it went towards the maximum point of the characteristic curve in the tubes with inserts. The amplitudes and periods of the density-wave type oscillations were lower than those of the pressure-drop type oscillations. By comparing the bare tube and the tubes with inserts on the basis of density-wave type oscillations, it was observed that the amplitudes and periods for the tube configurations with inserts were higher than those of the bare tube. There was no important difference among the tubes with inserts on the basis of density-wave type oscillations.


Articles with similar content:

The Effect of Augmented Surfaces on Two-Phase Flow Instabilities in a Horizontal System
Journal of Enhanced Heat Transfer, Vol.2, 1995, issue 4
Omer Comakli, F. Widmann, Sadik Kakac, Y. Ding, Claudia O. Gavrilescu
INCREASE OF HEAT EXCHANGER EFFICIENCY FOR YAWED TUBE BANKS
International Heat Transfer Conference 9, Vol.5, 1990, issue
H. G. Groehn
PERFORMANCE OF ENHANCEMENT DEVICES
Performance Optimization of Internally Finned Tubes for Laminar Flow Heat Exchangers

ICHMT DIGITAL LIBRARY ONLINE, Vol.19, 1981, issue
Hassan M. Soliman, A. C. Trupp
FLOW BEHAVIOR IN A PARALLEL-TUBE HEAT TRANSPORT DEVICE ANALYZED BY USING IMAGE PROCESSING
Journal of Flow Visualization and Image Processing, Vol.17, 2010, issue 4
Akira Murata, Kaoru Iwamoto, Hiroshi Saito, Sadanari Mochizuki, Thanh-Long PHAN
HEAT TRANSFER ENHANCEMENT BY DOUBLY AUGMENTED TUBES
International Heat Transfer Conference 8, Vol.6, 1986, issue
N. Z. Azer, N. Kaushik