A effect of biosurfactant additive on pool boiling of organic liquids over aluminium
摘要
This study examines the effect of the biosurfactant coco glucoside on saturated pool boiling of acetone, methanol, and ethanol on an aluminium surface. Experiments were carried out at concentrations of 0, 500, 1000, and 1500 PPM. The results show that the response of each liquid is different and the effect is not linear. Methanol shows the highest improvement at 1.0 mL, where the heat transfer coefficient increases from 7096.77 to 8943.09 W m−2 K−1. Ethanol shows a steady increase in HTC with concentration and reaches 6156.72 W m−2 K−1 at 1500 PPM. Acetone shows a small rise at low concentration and a clear drop at 1.5 mL. These trends are linked to changes in surface tension and bubble behaviour caused by the surfactant. The study also includes the development of an empirical correlation for predicting PBHTC and the use of machine learning algorithms to improve HTC prediction. The k nearest neighbour, random forest and gradient boosted tree models were trained using the experimental data. Among these, the gradient boosted tree algorithm gave the best performance with an R squared value of 0.9922 and a mean absolute percentage error of 3.27 percent. These findings show that selecting the correct surfactant concentration is important for improving boiling performance in practical applications such as heat exchangers, power plants and refrigeration systems.