Model to calculate mass flow rate and other quantities of two-phase flow in a pipe with a densitometer, a drag disk, and a turbine meter

Technical Report · Sat Nov 01 04:00:00 EST 1975

DOI:https://doi.org/10.2172/4186234· OSTI ID:4186234

Aya, I.

The proposed model was developed at ORNL to calculate mass flow rate and other quantities of two-phase flow in a pipe when the flow is dispersed with slip between the phases. The calculational model is based on assumptions concerning the characteristics of a turbine meter and a drag disk. The model should be validated with experimental data before being used in blowdown analysis. In order to compare dispersed flow and homogeneous flow, the ratio of readings from each flow regime for each device discussed is calculated for a given mass flow rate and steam quality. The sensitivity analysis shows that the calculated flow rate of a steam-water mixture (based on the measurements of a drag disk and a gamma densitometer in which the flow is assumed to be homogeneous even if there is some slip between phases) is very close to the real flow rate in the case of dispersed flow at a low quality. As the steam quality increases at a constant slip ratio, all models are prone to overestimate. At 20 percent quality the overestimates reach 8 percent in the proposed model, 15 percent in Rouhani's model, 38 percent in homogeneous model, and 75 percent in Popper's model. (auth)

• Research Organization: Oak Ridge National Lab., Tenn. (USA)
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-33-005549
• OSTI ID: 4186234
• Report Number(s): ORNL-TM--4759
• Country of Publication: United States
• Language: English

Related Subjects

*TWO-PHASE FLOW-- VOID FRACTION
420400* --Engineering--Heat Transfer & Fluid Flow
ACCURACY
DATA
DENSITOMETERS
FLOWMETERS
MATHEMATICAL MODELS
MEASURING METHODS
N42300* --Engineering--Heat Transfer & Fluid Flow
NUMERICAL SOLUTION
RELIABILITY
STEAM
WATER