An Investigation of the Liquid Distribution in Annular-Mist Flow

Abstract

The results of an experimental investigation of the average liquid film thickness are presented for vertical upward annular-mist two-phase flow, with and without heat transfer. The effects on the film thickness for variations in vapor flow rate, liquid flow rate, vapor density, and heat transfer are described. A correlation equation is presented for the local time-averaged thickness and for the droplet size distribution. In addition, an equation is given for the liquid film flow rate as a function of the average film thickness.

The Models Used in Predicting Steam Condensation Occurs during Nuclear Reactor Loss of Coolant Accident

“…These results were obtained by dividing the test section of Pogston et al [49] into 10 fluid volumes, each 1.83 cm in length. The RELAP5/MOD3 model as shown in figure predicts the liquid film thickness more significant than that of Asali et al [50].…”

Drop sizes in annular gas‐liquid flows

“…A length mean drop diameter can be defined as dlo = Som&fnddp. Although droplet distributions measured by Namie and Ueda (1972) and Pogson, Roberts, and Waibler (1970) did not contain enough of the large drops to calculate d,,, they were adequate for obtaining dlo. From these data we recommend that dlo be estimated by It is concluded that a Kelvin-Helmholtz instability provides a theoretical explanation for droplet formation in annular gas-liquid flows which is consistent with presently available measurements of drop size and with photographic studies by Woodmansee and Hanratty (1969).…”

“…Drop sizes have been measured in annular flows with a high speed motion picture camera by Russell and Rcgers (1972) for air-water flow in a horizontal channel 0.025 m wide, 0.152 m high, and 4.27 m long. Still photography was used by Cousins and Hewitt for upward flow of air and water in a pipe with a 0.0095 m diameter and by Pogson, Roberts, and Waibler (1970) for upward flow of steam and water in a pipe with a diameter of 0.0032 m. Namie and Ueda (1972) measured drop size for air-water flow in a horizontal 0.06 x 0.01 m channel by collecting samples of the spray in a silicone oil. Wicks and Dukler ( 1966) and Wicks (1967) developed an electrical conduction probe to measure drop size.…”

Modeling Liquid Droplet Sizes in Gas–Liquid Annular Flow

“…This small difference does not significantly affect the modeling study. Azzopardi (1985) [6] reviewed the methods of the droplet-size measurements and the experimental data of several studies [45,[67][68][69][70] and explained that their data were not reliable quantitatively to build and evaluate models. Therefore, these data are not considered in this study.…”