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СпутникиРНSpaceXРоскосмосNASAPublication date: 14 July 2026
Source: Defect and Diffusion Forum Vol. 453
Author(s): Untung Surya Dharma, I. Gusti Ngurah Bagus Catrawedarma, Indarto Indarto, Deendarlianto Deendarlianto
The movement of gases and liquids in a minichannel with a T-junction during two-phase flow is also important in fields like medicine, chemistry, and thermal management. The dynamics of the influence of the bend radius on the downstream pressure difference are not well comprehended. This paper examines the statistical characterisation of the pressure drop downstream of a horizontal T-junction in a minichannel, considering the observed flow patterns. The geometric parameters of the T-junction involved are variations of the ratio of the bend radius to the hydraulic diameter (r/Dh = 0.5, 0.7 and 1.0). Air and water are used as test fluids, with superficial velocities ranging from 0.59 to 2.96 m.s-1 for air (Jg) and 0.63 to 3.19 m.s-1 for water (Jl). The pressure sensors are used to measure pressure drop signals (ΔP2-3), which are recorded by a data collection device at 1000 Hz. A high-speed camera is also used to record the flow and verify the flow regime. There are six downstream flow regimes identified, and they include: Bubbles, Bubble to Slug, Slug, Elongated Slug, Churn to Elongated Slug, and Churn. These flow patterns are characterised using statistical, spectral, and nonlinear analysis methods. The findings suggest that as the bend radius increases, the amplitude of fluctuations also increases and the probability distribution becomes wider. However, there is a possibility that larger bend radii decrease chaos levels, resulting in a characteristic regime pattern. Additionally, there are artificial neural networks (ANN) that utilise wavelet energy variance as input, achieving a classification accuracy of 85.5%. The ordered association between statistical characterisation and regime classification through ANN is useful in comprehending the impact of the instability due to the bend radius in multiphase flow. These results complement the basic knowledge and predictive modelling of pressure drops in minichannels with horizontal T-junctions.
[1] Kusumaningsih, H., Indarto, Kawahara, A., Catrawedarma, I. G. N. B., & Deendarlianto. (2024). Examining the interfacial behavior of non-Newtonian gas-liquid two-phase flow in horizontal square microchannels. Flow Measurement and Instrumentation, 96(2), 102548.
[2] Wijayanta, S., Indarto, Deendarlianto, Catrawedarma, I. G. N. B., & Hudaya, A. Z. (2022). Statistical characterization of the interfacial behavior of the sub-regimes in gas-liquid stratified two-phase flow in a horizontal pipe. Flow Measurement and Instrumentation, 102107.
[3] Elazhary, A. M., & Soliman, H. M. (2012). Two-phase flow in a horizontal mini-size impacting T-junction with a rectangular cross-section. International Journal of Multiphase Flow, 42, 104–114.
[4] Garstecki, P., Fuerstman, M. J., Stone, H. A., & Whitesides, G. M. (2006). Formation of droplets and bubbles in a microfluidic T-junction - Scaling and mechanism of break-up. Lab on a Chip, 6(3), 437–446.
DOI: 10.1039/b510841a
[5] Haase, S. (2017). Characterisation of gas-liquid two-phase flow in minichannels with co-flowing fluid injection inside the channel, part II: gas bubble and liquid slug lengths, film thickness, and void fraction within Taylor flow. International Journal of Multiphase Flow, 88, 251–269.
[6] Shaban, H., & Tavoularis, S. (2014). Identification of flow regime in vertical upward air-water pipe flow using pressure drop signals and elastic maps. International Journal of Multiphase Flow, 61, 62–72.
[7] Dharma, U. S., Dwiputri, C. A., Deendarlianto, & Indarto. (2024). Experimental Study of Two-Phase Flow on Flow Patterns, Flow Patterns Map and Slug Frequency in The Downstream Area of Horizontal Mini channel T-Junction with Bend Radius (r/Dh) 0.7. AIP Conference Proceedings, 3090(1), 0–11.
DOI: 10.1063/5.0231061
[8] Majumder, A., & Majumder, S. (2015). Effect of corner radius of a T-junction mini-square channel on fluid flow and heat transfer in the developing region: A three dimensional numerical simulation. Procedia Engineering, 105(Icte 2014), 89–95.
[9] Dharma, U. S., Deendarlianto, & Indarto. (2019). Two Phase Flow Pressure Drop Measurement Analysis in a Horizontal Rectangular Minichannel T-Junction. 090007.
DOI: 10.1063/5.0207223
[10] Hananto, L. H., Indarto, Untung Surya Dharma, & Deendarlianto. (2024). Pengaruh Penambahan Radius Pada Kecepatan Dan Frekusensi Slug di Daerah Downstream T-Junction Minichannel. Jurnal Rekayasa Mesin, 15(2), 875–884. https://doi.org/10.21776/ jrm.v15i2.1586.
[11] Widodo, G. D., & Dharma, U. S. (2025). Numerical Study of the Bubble Formation Mechanism in Horizontal Liquid-Gas Flow In A T- Junction Minichannel. 16(2), 649–661.
[12] Arias, S., & González-Cinca, R. (2016). Analysis of the characteristic lengths in the bubble and slug flow regimes generated in a capillary T-junction. International Journal of Multiphase Flow, 87, 167–174.
[13] De menech, M., Garstecki, P., Jousse, F., & Stone, H. A. (2008). Transition from squeezing to dripping in a microfluidic T-shaped junction. Journal of Fluid Mechanics, 595, 141–161.
[14] Nayak, R., Lobo, O. J., Chatterjee, D., & Das, S. K. (2018). Effect of geometrical parameters on slug behaviour and two phase pressure drop in microchannel T-junctions. Chemical Engineering and Processing - Process Intensification, 130(April), 76–87.
[15] Qian, D., & Lawal, A. (2006). Numerical study on gas and liquid slugs for Taylor flow in a T-junction microchannel. Chemical Engineering Science, 61(23), 7609–7625.
[16] Sang, L., Hong, Y., & Wang, F. (2009). Investigation of viscosity effect on droplet formation in T-shaped microchannels by numerical and analytical methods. Microfluidics and Nanofluidics, 6(5), 621–635.
[17] Santos, R. M., & Kawaji, M. (2010). Numerical modeling and experimental investigation of gas-liquid slug formation in a microchannel T-junction. International Journal of Multiphase Flow, 36(4), 314–323.
[18] Tice, J. D., Lyon, A. D., & Ismagilov, R. F. (2004). Effects of viscosity on droplet formation and mixing in microfluidic channels. Analytica Chimica Acta, 507(1), 73–77.
[19] Yamamoto, K., & Ogata, S. (2013). Effects of T-junction size on bubble generation and flow instability for two-phase flows in circular microchannels. International Journal of Multiphase Flow, 49, 24–30.
[20] Kawahara, A., Sadatomi, M., Nei, K., & Matsuo, H. (2011). Characteristics of two-phase flows in a rectangular microchannel with a T-junction type gas-liquid mixer. Heat Transfer Engineering, 32(7–8), 585–594.
[21] Santos, R. M., & Kawaji, M. (2011). Gas-liquid slug formation at a rectangular microchannel t-junction: A CFD benchmark case. Central European Journal of Engineering, 1(4), 341–360.
[22] Van Steijn, V., Kleijn, C. R., & Kreutzer, M. T. (2010). Predictive model for the size of bubbles and droplets created in microfluidic T-junctions. Lab on a Chip, 10(19), 2513–2518.
DOI: 10.1039/c002625e
[23] Dutkowki, K. (2009). Two-phase pressure drop of air-water in minichannels. International Journal of Heat and Mass Transfer, 52(21–22), 5185–5192.
[24] Kawahara, A., Chung, P. Y., & Kawaji, M. (2002). Investigation of two-phase flow pattern, void fraction and pressure drop in a microchannel. International Journal of Multiphase Flow, 28(9), 1411–1435.
[25] Kreutzer, M. T., Eijnden, M. G. V. Der, Kapteijn, F., Moulijn, J. A., & Heiszwolf, J. J. (2005). The pressure drop experiment to determine slug lengths in multiphase monoliths. Catalysis Today, 105(3–4), 667–672.
[26] Sudarja, Haq, A., Deendarlianto, Indarto, & Widyaparaga, A. (2019). Experimental study on the flow pattern and pressure gradient of air-water two-phase flow in a horizontal circular mini-channel. Journal of Hydrodynamics, 31(1),102-116.
[27] Warnier, M. J. F., De Croon, M. H. J. M., Rebrov, E. V., & Schouten, J. C. (2010). Pressure drop of gas-liquid Taylor flow in round micro-capillaries for low to intermediate Reynolds numbers. Microfluidics and Nanofluidics, 8(1), 33–45.
[28] Wu, H., Xu, Y., Wang, J., Yang, Y., Li, T., Zhang, T., Li, J., & Hao, C. (2021). Gas–liquid two-phase flowrate measurement in pseudo-slug flow with Venturi. Flow Measurement and Instrumentation, 78(May 2020), 101887.
[29] Wu, K., Galli, F., de Tommaso, J., Patience, G. S., & van Ommen, J. R. (2023). Experimental methods in chemical engineering: Pressure. Canadian Journal of Chemical Engineering, 101(1), 41–58.
DOI: 10.1002/cjce.24533
[30] Yamamoto, K., & Ogata, S. (2014). Drag reduction of slug flows in microchannels by modifying the size of T-junctions. International Journal of Multiphase Flow, 62, 67–72.
[31] Abiev, R. S. (2022). Mathematical model of two-phase Taylor flow hydrodynamics for four combinations of non-Newtonian and Newtonian fluids in microchannels. Chemical Engineering Science, 247, 116930.
[32] Arabi, A., Salhi, Y., Zenati, Y., Si-Ahmed, E. K., & Legrand, J. (2020). On gas-liquid intermittent flow in a horizontal pipe: Influence of sub-regime on slug frequency. Chemical Engineering Science, 211, 115251.
[33] Astyanto, A. H., Pramono, J. A. E., Catrawedarma, I. G. N. B., Deendarlianto, & Indarto. (2022). Statistical characterization of liquid film fluctuations during gas-liquid two-phase counter-current flow in a 1/30 scaled-down test facility of a pressurized water reactor (PWR) hot leg. Annals of Nuclear Energy, 172, 109065.
[34] Astyanto, A. H., Nugroho, A. N. A., Indarto, Gusti Ngurah Bagus Catrawedarma, I., Lucas, D., & Deendarlianto. (2023). Statistical characterization of the interfacial behavior captured by a novel image processing algorithm during the gas/liquid counter-current two-phase flow in a 1/3 scaled down of PWR hot leg. Nuclear Engineering and Design, 404(2), 112179.
[35] Catrawedarma, I. G. N. B., Resnaraditya, F. A., Deendarlianto, & Indarto. (2021). Statistical characterization of the flow structure of air-water-solid particles three-phase flow in the airlift pump-bubble generator system. Flow Measurement and Instrumentation, 82(2), 102062.
[36] de Oliveira, J. D., Copetti, J. B., Indrusiak, M. L. S., & Passos, J. C. (2019). Nonlinear analysis of characteristic frequencies and chaotic behavior of flow patterns during flow boiling of hydrocarbons in a small channel. International Journal of Multiphase Flow, 114, 240–257.
[37] Elperin, T., & Klochko, M. (2002). Flow regime identification in a two-phase flow using wavelet transform. Experiments in Fluids, 32(6), 674–682.
[38] Jana, A. K., Das, G., & Das, P. K. (2006). Flow regime identification of two-phase liquid-liquid upflow through vertical pipe. Chemical Engineering Science, 61(5), 1500–1515.
[39] Nguyen, V. T., Euh, D. J., & Song, C. H. (2010). An application of the wavelet analysis technique for the objective discrimination of two-phase flow patterns. International Journal of Multiphase Flow, 36(9), 755–768.
[40] Song, Y., Xin, F., Guangyong, G., Lou, S., Cao, C., & Wang, J. (2019). Uniform generation of water slugs in air flowing through superhydrophobic microchannels with T-junction. Chemical Engineering Science, 199, 439–450.
[41] Wijayanta, S., Deendarlianto, Indarto, Prasetyo, A., & Hudaya, A. Z. (2023). The effect of the liquid physical properties on the wave frequency and wave velocity of co-current gas-liquid stratified two-phase flow in a horizontal pipe. International Journal of Multiphase Flow, 158(2), 104300.
[42] Wang, S. F., Mosdorf, R., & Shoji, M. (2003). Nonlinear analysis on fluctuation feature of two-phase flow through a T-junction. International Journal of Heat and Mass Transfer, 46(9), 1519–1528.
[43] Xiang, J., Li, Q., Tan, Z., & Zhang, Y. (2017). Characterization of the flow in a gas-solid bubbling fluidized bed by pressure fluctuation. Chemical Engineering Science, 174, 93–103.
[44] Kusumaningsih, H., Deendarlianto, Indarto, Alfath, M. F., Madani, M. R. A., & Ritonga, A. F. (2023). Fourier and Wavelet Analysis of Pressure Fluctuations in Gas–Non-Newtonian Liquid Two-Phase Flows in a Microchannel. Multiphase Science and Technology, 35(3), 67–80.
[45] Wang, Q., Han, Z., Zhang, X., & Yang, Y. (2021). Dynamics of the delay-coupled bubble system combined with the stochastic term. Chaos, Solitons and Fractals, 148.
[46] Catrawedarma, I. G. N. B., Deendarlianto, & Indarto. (2021). Statistical Characterization of Flow Structure of Air–water Two-phase Flow in Airlift Pump–Bubble Generator System. International Journal of Multiphase Flow, 138, 103596.
[47] Xie, T., Ghiaasiaan, S. M., & Karrila, S. (2004). Artificial neural network approach for flow regime classification in gas-liquid-fiber flows based on frequency domain analysis of pressure signals. Chemical Engineering Science, 59 (11), 2241–2251.