Evaluating and optimizing of steam ejector performance considering heterogeneous condensation using machine learning framework

Momeni Dolatabadi, Amir; Mottahedi, Hamid Reza; Faghih Aliabadi, Mohammad Ali; Saffari Pour, Mohsen; Wen, Chuang; Akrami, Mohammad

doi:10.1016/j.energy.2024.132240

Energy

2024

DOI: 10.1016/j.energy.2024.132240

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Evaluating and optimizing of steam ejector performance considering heterogeneous condensation using machine learning framework

Amir Momeni Dolatabadi,

Hamid Reza Mottahedi,

Mohammad Ali Faghih Aliabadi

et al.

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2024

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Cited by 2 publications

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Prediction of surface heating effect on non-equilibrium homogeneous condensation in supersonic nozzle using CFD method

Man

2024

Chemical Product and Process Modeling

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To get better industrial equipment, one must understand the different phenomena within a machine. Non-equilibrium condensation is one of the natural phenomena happening in the process, thereby affecting flow behavior; the concept is vital in the understanding and optimizing machinery applied in industries. The present investigation focuses on the surface heating method, more precisely using the constant heat flux in the context of NEC inside a supersonic nozzle. The results indicate that the heat flux method can delay the droplet nucleation and growth inside the nozzle. However, this should be considered to a limit due to the raise of temperature at the nozzle wall. The rise in heat flux has reduced the Liquid Mass Fraction (LMF) within the nozzle. The LMF at the nozzle outlet and center line is determined to be 0.075, 0.072, and 0.068 for the adiabatic condition, 200 kW/m2 flux, and 400 kW/m2 flux, respectively. The heat flux also influences the flow pattern. With an increase in heat flux, the condensation shock wave is shifted downstream, decreasing its intensity.

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Prediction of surface heating effect on non-equilibrium homogeneous condensation in supersonic nozzle using CFD method

Man

2024

Chemical Product and Process Modeling

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Numerical Investigation of Non-Equilibrium Condensation in a Supersonic Nozzle Based on Spontaneous Nucleation

Kouchaksaraei,

Akrami

2024

Aerospace

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Non-equilibrium condensation involves intricate physics, making it crucial to thoroughly investigate the factors that influence it. Understanding these factors is essential for optimizing the system performance and minimizing the negative effects associated with non-equilibrium condensation. This study focused on examining the impact of various operational conditions in a saturated mode on non-equilibrium condensation within a supersonic nozzle. The operation conditions under investigation involved pressures of 25 kPa, 50 kPa, 75 kPa, and 100 kPa. Each saturation state was examined to assess its effect on various parameters, such as temperature, pressure, liquid mass fraction, droplet radius, nucleation rate, Mach number, and droplet count. A consistent pattern emerged across all samples. As the gas accelerated through the converging section of the nozzle, both pressure and temperature gradually decreased. However, upon reaching the throat and entering the divergent section, a phenomenon known as condensation shock occurred. This shock wave caused a sudden and significant spike in both pressure and temperature. Following the shock, both parameters resumed their downward trend along the remaining length of the nozzle. Interestingly, increasing the initial pressure of the gas led to a less intense condensation shock. Additionally, raising the saturation pressure at the nozzle inlet resulted in larger droplets and a higher concentration of liquid within the gas flow. By quadrupling the inlet saturation pressure from 25 to 100 kPa, a substantial 106.9% increase in droplet radius and a 9.65% increase in liquid mass fraction were observed at the nozzle outlet.

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Evaluating and optimizing of steam ejector performance considering heterogeneous condensation using machine learning framework

Cited by 2 publications

References 59 publications

Prediction of surface heating effect on non-equilibrium homogeneous condensation in supersonic nozzle using CFD method

Prediction of surface heating effect on non-equilibrium homogeneous condensation in supersonic nozzle using CFD method

Numerical Investigation of Non-Equilibrium Condensation in a Supersonic Nozzle Based on Spontaneous Nucleation

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