• Agus Sunjarianto Pamitran Department of Mechanical Engineering, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia
  • Sentot Novianto Department of Mechanical Engineering, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia
  • Normah Mohd-Ghazali Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia
  • Nasruddin Nasruddin Department of Mechanical Engineering, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia
  • Raldi Koestoer Department of Mechanical Engineering, Universitas Indonesia, Kampus UI Depok, 16424, Indonesia



Void fraction, pressure drop, two-phase flow, boiling, R-290


Two-phase flow boiling pressure drop experiment was conducted to observe its characteristics and to develop a new correlation of void fraction based on the separated model. Investigation is completed on the natural refrigerant R-290 (propane) in a horizontal circular tube with a 7.6 mm inner diameter under experimental conditions of 3.7 to 9.6 °C saturation temperature, 10 to 25 kW/m2 heat flux, and 185 to 445 kg/m2s mass flux. The present experimental data was used to obtain the calculated void fraction which then was compared to the predicted void fraction with 31 existing correlations. A new void fraction correlation for predicting two-phase flow boiling pressure drop, as a function of Reynolds numbers, was proposed. The measured pressure drop was compared to the predicted pressure drop with some existing pressure drop models that use the newly developed void fraction model. The homogeneous model of void fraction showed the best prediction with 2% deviation


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