An experimental system that used a constant hot-water-heating heat pipe was constructed to study the performance of a parallel-type pulsating heat pipe under normal temperature. With methanol as the medium and a heat pipe diameter of 4 mm

the effects of different cooling forms

heating and cooling temperatures

and liquid filling volumes on the starting characteristics were studied. The influence of different diameters (2 mm

4 mm

6 mm

and 8 mm) on the isothermal property was researched with methanol as the medium

and the heat-transfer capabilities with different heating lengths (20 cm

25 cm

and 30 cm) under methanol and R600a as working media were investigated. The results showed that a condenser section that used water cooling was better than natural air cooling for heat pipe start-up. A higher heating temperature and lower cooling temperature were advantageous for the heat pipe start-up. The start-up time of the heat pipe increased with the filling quantity. During the running period

the heat pipe had a good isothermal property in the longitudinal and transverse directions

and the isothermal property gradually decreased with an increase in the heat pipe diameter. With an increase in the heating temperature

the changing laws for the heat-transfer capability were different when the working media are methanol and R600a. Shortening the evaporation segment length could alleviate the adverse effects of overheating on the heat pipe