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Numerical modelling of dry-out in pulsating heat pipe using VOF model
Karthikeyan Cheiyar Palani,Deepakkumar Rajagopal 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
Operational limits are critical in the continuous functioning of a pulsating heat pipe (PHP). A computational fluid dynamics study was conducted to analyze the influence of working-fluid properties on the dry-out limit of closed-loop water-based PHP with a 50 % fill ratio. Working fluid (water) was boiled decisively at low temperature (35 °C) under reduced operating pressures to ease and analyze dry-out. Although, vapor pressure of water at 35 °C is 5.6 kPa; different evacuated pressures ranging from 2 to 10 kPa were attempted to validate the numerical model using different boiling characteristics and their influence on the dry-out phenomena. 2-D transient pressure based Navier-Stokes solver (ANSYS Fluent) was used to predict the field variables using the SIMPLE algorithm. The standard k-ϵ model with the enhanced wall treatment approach was used to capture the turbulent physics. VOF model was used to shape the two-phase flow characteristics. The adiabatic section was noticed to act as a functional barrier (for the pressure drop to occur) between evaporator and condenser sections. New concepts such as inverse flow dynamics, zero-gradient and equivalent points were established from time variation plots of working fluid properties.