Applications of Heart Shaped Glass Spoon Loop Oscillating Heat Pipe (HSGS/LOHP) for Making Coffee Stirrer

This study aimed to investigate the application of a Heart Shaped Glass Spoon Loop Oscillating Heat Pipe (HSGS/LOHP) made of a glass tube. The results showed that HSGS/LOHP can be practically used for stirring hot coffee in a cup. At the working substance filling rates of 80 and 60%, slug and annular flows of the working substance pattern were found while at 40% only the slug flow was found. The maximum mean lengths of the slug and annular flows of the working substance were 0.0259 and 0.00443 m which occurred at the working substance filling rate of 80% at the evaporator temperatures of 40℃, the average velocity was the highest for every working substance filling rate at the evaporator temperatures 70°C. The slug and annular flow patterns had maximum speeds of 0.00171 and 0.00111 m/s when tested at the 40% and 60% working substance filling rates, respectively. The working substance at the evaporator temperature of 40℃ and the filling rate of 80% had the highest buoyancy force and moment of inertia of 4.90 ± 0.25 kN and 901.77 ± 45.08 Tm2·kg, respectively.