Studi Pengaruh Sifat Fisik Viskositas Fluida Terhadap Performa Hidrodinamika Dan Preassure Drop Dalam Sistem Pipa Vertikal Aliran Dua Fase

Abstrak

Two-phase flow in vertical pipes exhibits complex behavior influenced by the physical properties of the fluid, particularly viscosity. This study aims to examine how viscosity affects flow patterns and pressure drop in air flow mixed with a more viscous liquid. The experiments were conducted by adjusting the air flow rate while keeping the liquid flow rate constant. Changes in air flow were observed to identify the resulting flow patterns and variations in pressure drop for both fluids. The results show that for low-viscosity water, the flow pattern formed at an air flow rate of 8.33×10⁻⁵ m³/s is slug flow. When the air flow rate is increased to 3.33×10⁻⁴ m³/s, the pattern transitions to churn flow, and at 5.0×10⁻⁴ m³/s to 8.33×10⁻⁴ m³/s the flow shifts to bubble flow. In the viscous liquid, the slug size and bubble distribution differ, with slugs in low-viscosity fluids being longer. In terms of pressure drop, air–water flow produces a lower pressure drop compared to air flow with viscous liquid at the same air rate. Increasing viscosity raises friction and flow resistance, thereby increasing the pressure drop. Overall, viscosity significantly affects flow pattern transitions and pressure drop in two-phase flow within vertical pipes. Keywords: Two phase, pressure drop, Viscosity