The effect of horizontal pipe length to the onset of flooding position on the air-water counter current two-phase flow in a 1/30 scale of pressurized water reactor (PWR)

2018 ◽  
Author(s):  
A. Badarudin ◽  
S. T. Pinindriya ◽  
Y. V. Yoanita ◽  
M. S. Hadipranoto ◽  
S. Hartono ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Pressurized Water Reactor ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Pipe Length ◽  
Pressurized Water ◽  
Water Reactor ◽  
Counter Current

Interfacial behavior of the air-water counter-current two-phase flow in a 1/30 scale-down of pressurized water reactor (PWR) hot leg

2018 ◽  
Vol 116 ◽  
pp. 376-387
Author(s):  
Apip Badarudin ◽  
Andriyanto Setyawan ◽  
Okto Dinaryanto ◽  
Arif Widyatama ◽  
Indarto ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Pressurized Water Reactor ◽  
Interfacial Behavior ◽  
Two Phase ◽  
Pressurized Water ◽  
Water Reactor ◽  
Scale Down ◽  
Counter Current

Numerical Simulation of Flow Regime Transition From Slug to Wavy Flow in Helically Coiled Tubes

2016 ◽  
Author(s):  
Zhaoxu Li ◽  
Hongye Zhu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Centrifugal Force ◽  
Slug Flow ◽  
Two Phase Flow ◽  
Flow Regimes ◽  
Phase Flow ◽  
Pressurized Water Reactor ◽  
Two Phase ◽  
Pressurized Water

Two-phase flow in helically coiled tubes is becoming the interest of many investigators because of its importance in various applications, such as nuclear engineering, chemical engineering, refrigerating engineering and power engineering. Compared with U-type tubes used in pressurized water reactor (PWR), helically coiled tubes have advantages in size, heat transfer capacity, thermal stress toleration and two-phase stability. Accordingly the helically coiled tubes have been utilized in the steam generators of the next general reactors, such as gas-cooled reactor, fast breeder reactor and integrated pressurized water reactor. In helically coiled tubes the characteristics of momentum and heat transfer are distinct from those in straight tubes due to the presence of centrifugal force, especially for two-phase flow. Meanwhile, the transitions of flow regime, which is the crucial knowledge for the designers to determine the heat transfer rates and flow resistance, are also significantly affected by the centrifugal force. In this study, two-phase flow regimes in helically coiled tubes are investigated. Computational fluid dynamics (CFD), using fractional volume of fluid (VOF) model, is carried out to simulate wavy and slug flow regimes in helically coiled tubes. The corresponding experiment is also conducted to visualize these flow regimes at different superficial flow velocities. Numerical simulation results actually reflect the influence of centrifugal force on the two-phase flow and show a good agreement with the photographs captured from the experiment. Based on the simulations at different superficial flow velocities, the boundary between the slug and wavy flow regimes is predicted, in addition, compared with that in inclined tubes. The comparison indicates that centrifugal force could induce the appearance of wavy flows in advance and prompt the transition from slug flow to wavy flow.

scholarly journals Counter Current Flow Limitation of Gas-Liquid Two-Phase Flow in Nearly Horizontal Pipe

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Sigit Prayitno ◽  
R. A. Santoso ◽  
Deendarlianto ◽  
Thomas Höhne ◽  
Dirk Lucas
Keyword(s):  
Inclination Angle ◽  
Current Flow ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Flow Limitation ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Air Inlet ◽  
Inner Diameter ◽  
Counter Current

Experimental work about counter current two-phase flow of air and gas in nearly horizontal pipe has been performed. The work was performed in a 1.1 m long circular transparent acrylic pipe with 50 mm inner diameter, in two inclination angle settings (20° and 10° from horizontal). The smooth liquid and air inlet was used. Porous liquid inlet and a nozzle connected with calm section were used as liquid and gas inlet. The effect of liquid properties is examined by using five different working fluids (Water, two different concentration of butanol and glycerin aqua solutions). As for results. (1) CCFL causes a drastic change in the delivered liquid to the lower plenum. (2) The effect of inclination angle is significantly observed. The flooding gas superficial velocity decreases with inclination angle. (3) The liquid viscosity affects the flooding phenomena.

Characteristics of Downcomer Boiling Phenomena During the Reflood Phase of a Postulated Large Break LOCA for the APR1400

2006 ◽  
Author(s):  
Byong-Jo Yun ◽  
Dong-Jin Euh ◽  
Won-Man Park ◽  
Young-Jung Youn ◽  
Chul-Hwa Song
Keyword(s):  
Two Phase Flow ◽  
Transient Behavior ◽  
Visual Observation ◽  
Test Facility ◽  
Phase Flow ◽  
Pressurized Water Reactor ◽  
Two Phase ◽  
Pressurized Water ◽  
Flow Parameters ◽  
Core Cooling

Downcomer boiling phenomena in a conventional pressurized water reactor have an important effect on the transient behavior of a postulated large-break LOCA (LBLOCA), because it can degrade the hydraulic head of the coolant in the downcomer and consequently affect the reflood flow rate for a core cooling. To investigate the thermal hydraulic behavior in the downcomer region, a test program for a downcomer boiling is being progressed in the reflood phase of a postulated LBLOCA. For this, the test facility was designed as a one side heated rectangular test section which adopts a full-pressure, full-height, and full-size downcomer-gap approach, but with the circumferential length reduced 47.08-fold. The test was performed by dividing it into two-phases: (I) visual observation and acquisition of the global two-phase flow parameters and (II) measurement of the local two-phase flow parameters on the measuring planes along five elevations. In the present paper, the test results of Phase-I and parts of Phase-II were introduced.

708 Gas-liquid counter-current two-phase flow in near horizontal pipe

2007 ◽  
Vol 2007.45 (0) ◽  
pp. 251-252
Author(s):  
Daisuke YASUMOTO ◽  
Yoshikazu UEHARA ◽  
Akiharu OUSAKA ◽  
Akira KARIYAZAKI ◽  
Koji KUSANO
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Horizontal Pipe ◽  
Counter Current
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