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All Journal TEKNOSAINS: Jurnal Sains, Teknologi dan Informatika
Haslinda Kusumaningsih
Universitas Gadjah Mada, Indonesia

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Characteristics of two-phase flow patterns of non-Newtonian fluid xanthan gum-nitrogen in a horizontal square microchannel at high temperature Ahmad Yusuf Ramadhan; Haslinda Kusumaningsih; Deendarliyanto
TEKNOSAINS : Jurnal Sains, Teknologi dan Informatika Vol 12 No 2 (2025): TEKNOSAINS: Jurnal Sains, Teknologi dan Informatika
Publisher : LPPMPK- Universitas Muhammadiyah Cileungsi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37373/tekno.v12i2.1496

Abstract

The development of microfluidic systems in the microscale requires a deep understanding of the characteristics of two-phase flow, especially when involving non-Newtonian fluids such as Xanthan Gum (XG) solution. This study aims to examine the flow patterns, transitions between patterns, and frictional pressure drop in two-phase flows of XG-Nitrogen and Aquades-Nitrogen in a square-shaped horizontal microchannel at high temperatures. The methods used include an experimental approach with high-speed camera visualization and pressure measurements, as well as numerical analysis using a two-phase pressure drop prediction model. The experimental results show three main flow patterns, namely slug, churn, and slug-annular, with the absence of bubbly and wavy-annular patterns in the XG flow, indicating the strong influence of non-Newtonian viscosity. The flow pattern transition occurs with increasing gas flow rate, causing changes in the slug shape. The evaluation of the prediction model shows better accuracy in 0.2% XG solution compared to Aquades, although there is still a deviation at high values. This study confirms the importance of non-Newtonian fluid viscosity on flow stability and frictional stress, and contributes to the design of more efficient microcooling systems
Co-Authors Ahmad Yusuf Ramadhan Deendarliyanto