Low-grade heat Oscillatory

h i g h l i g h t s " We develop a nonlinear model for a two-phase heat-powered thermofluidic engine. " We compare the results with an existing linear model and experimental observations. " The two models predict a similar oscillation frequency for the fluid pumping device. " The predicted efficiencies are dissimilar and in some cases have different trends. " The nonlinear model gives more realistic predictions of actual engine performance. a r t i c l e i n f o Article history