Experimental investigations of the interface between steam and water two phase flows

Hydrodynamic instabilities play an important role in the design of those systems operated at high temperature and pressure. The creation and propagation of Kelvin–Helmholtz (KH) instabilities has been experimentally investigated here for the first time in condensable fluids i.e. steam and water. G...

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Main Authors:	Afrasyab, Khan, Noaman, Ul Haq, Imran Rafiq, Chughtai, Ajmal, Shah, K., Sanaullah
Format:	Article
Language:	English
Published:	Elsevier Ltd. 2014
Subjects:	TC Hydraulic engineering. Ocean engineering
Online Access:	http://ir.unimas.my/9171/ http://ir.unimas.my/9171/ http://ir.unimas.my/9171/ http://ir.unimas.my/9171/1/1-s2.0-S0017931014001525-main%20-%20cutted.pdf

id	unimas-9171
recordtype	eprints
spelling	unimas-91712017-03-01T01:25:14Z http://ir.unimas.my/9171/ Experimental investigations of the interface between steam and water two phase flows Afrasyab, Khan Noaman, Ul Haq Imran Rafiq, Chughtai Ajmal, Shah K., Sanaullah TC Hydraulic engineering. Ocean engineering Hydrodynamic instabilities play an important role in the design of those systems operated at high temperature and pressure. The creation and propagation of Kelvin–Helmholtz (KH) instabilities has been experimentally investigated here for the first time in condensable fluids i.e. steam and water. Generally, in case of these condensable fluids the instabilities are so much short lived that it’s very difficult to record them. Here the instabilities occurred in the close vicinity of the steam–water interface, were attributed mainly to the temperature fluctuations of micro scale or less. Supersonic steam was injected inside the subcooled water at inlet pressure varying from 1.5 bar to 3.0 bar by using a specially designed supersonic nozzle, whereas temperature of water inside the vessel was raised from 30 �C to 60 �C at an increment of 50 each. Kelvin–Helmholtz instabilities in the form of minor as well as amplified transient temperature fluctuations were recorded using a specially designed apparatus that uses LM35 sensors and data acquisition system. This system is capable to record temperatures at a rate of one millisecond and was also capable to record the temperatures anywhere inside the vessel. It was also found out that the instabilities created at the interface propagated towards the axis of the geometry as well as these instabilities were strongly affected by change in tank water temperature and inlet pressure Elsevier Ltd. 2014 Article NonPeerReviewed text en http://ir.unimas.my/9171/1/1-s2.0-S0017931014001525-main%20-%20cutted.pdf Afrasyab, Khan and Noaman, Ul Haq and Imran Rafiq, Chughtai and Ajmal, Shah and K., Sanaullah (2014) Experimental investigations of the interface between steam and water two phase flows. International Journal of Heat and Mass Transfer, 73. pp. 521-532. ISSN 0017-9310 http://ac.els-cdn.com/S0017931014001525/1-s2.0-S0017931014001525-main.pdf?_tid=60daf3a4-fe1d-11e6-9 http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.02.035
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Sarawak
building	UNIMAS Institutional Repository
collection	Online Access
language	English
topic	TC Hydraulic engineering. Ocean engineering
spellingShingle	TC Hydraulic engineering. Ocean engineering Afrasyab, Khan Noaman, Ul Haq Imran Rafiq, Chughtai Ajmal, Shah K., Sanaullah Experimental investigations of the interface between steam and water two phase flows
description	Hydrodynamic instabilities play an important role in the design of those systems operated at high temperature and pressure. The creation and propagation of Kelvin–Helmholtz (KH) instabilities has been experimentally investigated here for the first time in condensable fluids i.e. steam and water. Generally, in case of these condensable fluids the instabilities are so much short lived that it’s very difficult to record them. Here the instabilities occurred in the close vicinity of the steam–water interface, were attributed mainly to the temperature fluctuations of micro scale or less. Supersonic steam was injected inside the subcooled water at inlet pressure varying from 1.5 bar to 3.0 bar by using a specially designed supersonic nozzle, whereas temperature of water inside the vessel was raised from 30 �C to 60 �C at an increment of 50 each. Kelvin–Helmholtz instabilities in the form of minor as well as amplified transient temperature fluctuations were recorded using a specially designed apparatus that uses LM35 sensors and data acquisition system. This system is capable to record temperatures at a rate of one millisecond and was also capable to record the temperatures anywhere inside the vessel. It was also found out that the instabilities created at the interface propagated towards the axis of the geometry as well as these instabilities were strongly affected by change in tank water temperature and inlet pressure
format	Article
author	Afrasyab, Khan Noaman, Ul Haq Imran Rafiq, Chughtai Ajmal, Shah K., Sanaullah
author_facet	Afrasyab, Khan Noaman, Ul Haq Imran Rafiq, Chughtai Ajmal, Shah K., Sanaullah
author_sort	Afrasyab, Khan
title	Experimental investigations of the interface between steam and water two phase flows
title_short	Experimental investigations of the interface between steam and water two phase flows
title_full	Experimental investigations of the interface between steam and water two phase flows
title_fullStr	Experimental investigations of the interface between steam and water two phase flows
title_full_unstemmed	Experimental investigations of the interface between steam and water two phase flows
title_sort	experimental investigations of the interface between steam and water two phase flows
publisher	Elsevier Ltd.
publishDate	2014
url	http://ir.unimas.my/9171/ http://ir.unimas.my/9171/ http://ir.unimas.my/9171/ http://ir.unimas.my/9171/1/1-s2.0-S0017931014001525-main%20-%20cutted.pdf
first_indexed	2018-09-06T15:37:49Z
last_indexed	2018-09-06T15:37:49Z
_version_	1610873065867051008

Experimental investigations of the interface between steam and water two phase flows

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