This paper presents an experimental facility conducted in Hanoi Institute of Mechanics to investigate multiphase How pattern in the pipes. First and foremost, it ts used to define the conditions of water layer formation in the horizontal pipe. | Vietnam Journal of Mechanics, . NCST of Vietnam Vol. 21, 1999, No 3 (173- 178) SOME INITIAL EXPERIMENTAL RESULTS ON THE CONDITIONS OF FREE WATER LAYER FORMATION IN HORIZONTAL PIPES NGUYEN DUY THIEN, NGUYEN VAN D .I EP, DUONG NGOC HAl, NGUYEN HONG PHAN Institute of Mechanics, NCST of Vietnam ABSTRACT. This paper presents an experimental facility conducted in Hanoi Institute of Mechanics to investigate multiphase How pattern in the pipes. First and foremost, it ts used to define the conditions of water layer formation in the horizontal pipe. · I· Experimental results have been . obtained in stainless steel pipes ~f three different diameters (; and ) with white spindle oil N° 10 and water. They have been shown in the form of water layer maps. 1. Introduction Note that the simultaneous flow of oil, water in the pipes is a practical importance. Water and oil are immiscible liquids, they have differences in characteristics, such as density, viscosity, surface tension and so on. Flow pattern, free water layers which usually contacted with the walls of the pipe influence not only on flow charaterestics (such as pressure drop, liquid hold-up correlations) but also life of the pipe (ex. influence on·electro-chemical corrosions). In order to get the proper design and ·operation of the producing and transporting oil facilities and to control their performance, it's very important to have knowledge of the flow characteristics of the multiphase flow, su~h as flow pattern, pressure drop, liquid holdup and so on, especially conditions that waters will be gathered into one place, and let the water layer appeare. The determination of conditions of existence and transition from one of flow pattern to another is very complicated. There are numerous of experimental studies on this problem. ~uzhov A. I., Grishin A. D., . (1973) [1], conducted experiments in which the ratio of viscosities of oil/water is and the ratio of denties of oil/water is . The .
