Atomization and deposition rates in vertical annular two-phase flow

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6950081

Schadel, S A

The two-phase annular regime is characterized by a high velocity gas stream flowing through the core of the tube surrounded by a thin, highly agitated liquid film flowing concurrently along the tube wall. Part of the liquid may be entrained as droplets in the gas phase. The specific goals of this study were to measure fully developed rates of interchange and entrained fraction over a wide range of flow variables in the upward configuration of the annular regime, to obtain a more fundamental understanding of liquid interchange phenomena via studies of liquid film characteristics and to develop an improved design correlation for the entrained fraction. Towards this end, air-water experiments were conducted in two vertical pipe lines, 2.54 and 4.20 cm in diameter. Air velocities ranging from 20 to 120 m/s and total liquid flow rates ranging from 10 to 100 g/s were investigated. Two models for the rate of atomization, proposed by Tatterson (1975) and Leman (1985), were examined in light of the data obtained in this study. Deposition rates in the annular two-phase flow regime were modeled using a turbulent particle diffusion model; a new empirical relation for the rate of deposition is proposed.

• Research Organization: Illinois Univ., Urbana, IL (USA)
• OSTI ID: 6950081
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
AIR
ATOMIZATION
DEPOSITION
DIFFUSION
FILMS
FLUID FLOW
FLUIDS
GASES
HYDROGEN COMPOUNDS
MATHEMATICAL MODELS
OXYGEN COMPOUNDS
TWO-PHASE FLOW
WATER