Abstract
This paper reports the results of a study concerned with air–water and air–oil two-phase flow in channels packed with open-cell metal foams. The research was conducted in horizontal channel with an internal diameter of 0.02 m and length of 2.61 m. The analysis applied three metal foams with pore density 20, 30, and 40 PPI and porosity typical for industrial applications, changing in the range of 92–94%. The experimental data were used to develop a new method for predicting void fraction in two-phase gas–liquid flow in channels packed with metal foams. A new gas void fraction calculating method based on drift-flux model was developed. This model gives a correct representation of changes in the gas void fraction value and good prediction accuracy. The average relative error in calculating the air void fraction in two-phase flow is less than 13%, and 86% of experimental points is characterized by an error less than 20%.
Highlights
Fraction Prediction Method inThe rapid economic growth and human population development has the cost of very large and growing environmental pressures and impacts
The analysis of the void fraction in gas–liquid flow through channel packed with metal foam cannot be carried out in isolation from the flow patterns that are develop under specified hydrodynamic conditions
Based on the results of the statistical analysis and taking into account the similarity of the gas–liquid flow patterns identified during the tests to the flow patterns forming in empty channels, as well as their significant influence on the values of void fraction, it was decided to development of a new calculating method in packed channels based on assumptions right for separated flow
Summary
Fraction Prediction Method inThe rapid economic growth and human population development has the cost of very large and growing environmental pressures and impacts. The general concept of effective resource management forces the search for new design and technological solutions for devices that increase the efficiency and effectiveness of industrial processes. These devices include a wide group of apparatuses for heat and mass transfer such as heat exchangers, chemical reactors, solar panels, accumulators, or refrigeration systems. In flow-through devices such as heat exchangers and column apparatuses, porous packings can cause high flow resistance and increase energy consumption for pumping the fluid In this context, metal foams, due to their specific properties, show an advantage over other porous materials
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