Vol 6, No 6 (2015) > Mechanical Engineering >

Experimental Investigation of Slugging as Initiating Water Hammer Phenomenon through Indirect Contact Steam Condensing in a Horizontal Pipe Heat Exchanger

Sukamta Sukamta, Indarto Indarto, Purnomo Purnomo, Tri Agung Rohmat



Slugging as a water hammer initiator is a fascinating topic because it
has a strategic impact on equipment safety in industrial systems, i.e. pressurized water reactors (PWR), heat exchangers, etc. The present research’s objective
was to investigate slugging as initiating the water hammer phenomenon through indirect
contact steam condensing in a horizontal pipe heat exchanger. The experiment apparatus used in the present
experimental study consisted of an inner annulus pipe made of copper (din
= 17.2 mm, do = 19 mm) with a length of 1.8 m and an outer annulus pipe
of galvanized iron (din = 108.3 mm, do = 114. 3 mm) with
a length of 1.6 m. The tested liquid was water. The experiments were conducted
at a static pressure of Ps = 108.825 kPa and the temperature of T
= 119.7°C. The
obtained experimental data of temperature and differential pressure fluctuations were analyzed
using statistical analysis. The results were as follows: 1) the flow pattern area of non-slugging
(stratified and wavy flow), transition (wavy-slug flow), and slugging (slug and
large-slug) were determined, with the transition flow pattern of slug and
large-slug defined as initiating water hammer; 2) transition area ranges for the
wavy-slug flow pattern are from ṁco=1´10-1 kg/s to ṁco=6´10-1 kg/s for ṁst=6´10-3 kg/s to ṁst=7.5´10-3 kg/s, and
co< 3´10-1 kg/s for ṁst=8´10-3 kg/s to ṁst=9´10-3 kg/s.
These obtained data are very important in order to develop a database for the input
of an early warning system design in a safe, two-phase flow installation piping
system during steam condensation.

Keywords: Heat exchanger; Horizontal pipe; Slugging; Steam condensation; Two-phase flow

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Cai, Y., Wambsganss, M.W., Jendrzejczyk, J.A., 1996. Application of Chaos Theory in Identification of Two-phase Flow Patterns and Transitions in a Small, Horizontal, Rectangular Channel. ASME Journal of Fluids Engineering, Volume 118, pp. 383–390

Ghiaasiaan, M.S., 2008. Two-phase Flow, Boiling, and Condensation in Conventional and Miniature System. New York: Cambridge University Press, pp. 112–492

Kirsner, W., 1998. Steam Condensation Induced Waterhammer. Atlanta: HPAC Article Heating/Piping/Air Conditioning

Mandhane, J.M., Gregory, G.A., Aziz, K., 1974. A Flow Pattern Map for Gas-liquid Flow in Horizontal Pipes. International Journal of Multiphase Flow, Volume 1(4), p. 537–553

Mastui, G., 1986. Automatic Identification of Flow Regimes in Vertical Two-phase Flow using Differential Pressure Fluctuations. Nuclear Engineering and Design, Volume 95, pp. 221–231

Nagae, T., Murase, M., Wu, T., Vierow, K., 2005. Evaluation of Reflux Condensation Heat Transfer of Steam-air Mixtures Under Gas-liquid Countercurrent Flow in a Vertical Tube. Journal of Nuclear Science and Technology, Volume 42(1), pp. 50–57

Wang, W.C., Ma, X.H., Wei, Z.D., Yu, P., 1998. Two Phase Flow Patterns and Transition Characteristic for In-tube Condensation with Different Surface Inclination. International Journal of Heat and Mass Transfer, Volume 441, pp. 4341–4349

Wang, S.F., Mosdorf, R., Shoji, M., 2003. Nonlinear Analysis on Fluctuation Feature of Two-phase Flow Through a T-junction. International Journal of Heat and Mass Transfer, Volume 46, pp. 1519–1528