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Numerical analysis of the internal flow and the mixing chamber length effects on the liquid film thickness exiting from the effervescent atomizer

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Abstract

Two-phase flow was simulated within the effervescent atomizer by the volume of fluid interface tracing model. Different gas-to-liquid mass ratios (GLRs) of 0.08, 0.32, 1.24 and 4.9% at 0.38 L min−1 liquid flow rate have been studied. The purpose of this simulation is to study two-phase flow regimes within the effervescent atomizer and their effects on the atomization quality. The compressibility effect of the gas phase was considered in the present study, whereas it was ignored in the previous works. However, in this paper, the compressibility of gas phase has been included in the governing equations for GLR values of 1.24 and 4.9%, due to the high gas velocity. The effect of the gravity has also been considered through the all-numerical simulations. The results indicate that by increasing the GLR value, the two-phase bubbly flow with the type of Taylor bubbles transfers to the annular flow behavior at the inside of the discharge passage. In addition, the effect of the mixing chamber length on the thickness of the liquid film exiting from the effervescent atomizer investigated at different values of GLR. The simulation results showed that the effect of the mixing chamber length on the exiting liquid film thickness from the effervescent atomizer depends on GLR. At low GLR value (0.08%), increase in the mixing chamber length causes the liquid film thickness to increase. However, at high GLR value (1.24%) the behavior is vice versa. For middle value of GLR (0.32%), the liquid film thickness initially increases and then decreases as the mixing chamber length increases.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

    Zahra Alizadeh Kaklar & Mohammad Reza Ansari

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  1. Zahra Alizadeh Kaklar
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  2. Mohammad Reza Ansari
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Correspondence to Zahra Alizadeh Kaklar.

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Alizadeh Kaklar, Z., Ansari, M.R. Numerical analysis of the internal flow and the mixing chamber length effects on the liquid film thickness exiting from the effervescent atomizer. J Therm Anal Calorim 135, 1881–1890 (2019). https://doi.org/10.1007/s10973-018-7485-3

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  • DOI: https://doi.org/10.1007/s10973-018-7485-3

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