Abstract
Be determined which is the volumetric fraction. This paper presents a methodology to calculate volumetric fractions on the stratified flow regime, considering a cylindrical tube. A mathematical model of a measurement system was developed using the MCNP6 code. The mathematical equation was developed to calculate the volume fractions using the pulse height distributions obtained by a radiation detector. The stratified flow regime model considers air-oil, air-gasoline and oil-gasoline biphasic flow, in order to evaluate the performance of the proposed equation in fluid combinations with different densities. A comparative study with equations developed for square-section tubes from literature was performed. The study considered geometry of a source of 137Cs, an acrylic tubing measuring 8.0 cm in diameter and a 1¼ × ¾" NaI(T1) detector placed at a position diametrically opposed to a radiation source to measure the transmitted beam. The dimensions and materials to perform the simulation of the detectors were based on information obtained from the gammagraphy technique and the detector was experimentally validated. The volume fractions of each of the fluids were 0 up to 100% with variations of 25%.
Highlights
Due to the great demand for oil and its derivatives, extraction, refining and distribution are operations of great importance for the economy of a country
3.1 Detector validation In order to evaluate if the proposed mathematical model is in agreement with the reality, the experimental photopeak absolute efficiency was compared with the values obtained on mathematical model of the detector NaI(Tl) considering the same geometry used in the experimental procedures
The modeling of a detector by means of the MCNP6 code correctly experimental validated with measurements is a very important step in the practical implementation, since it tends to approach the real case
Summary
Due to the great demand for oil and its derivatives, extraction, refining and distribution are operations of great importance for the economy of a country. Many researchers have been investigating new methods that allow real-time and non-invasive measurement of important flow parameters, such as: flow rate, volume fraction, fluid and velocity [1 - 4]. These characteristics open a promising field for use of nuclear techniques. Devices based on nuclear techniques are compact and efficient for flow control which is extremely useful for the development of meters that provide accurate results for all fluids present in the multiphase flow, which is very important mainly for fiscal purposes
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