EFFECTS OF SCALE ON THE MECHANISM OF PULSATING HEAT PIPE

摘要

Under no influences of capillary hysteresis and gravity, the effects of capillary diameter and length scales on the operational mechanism of the circulating pulsating heat pipe (CPHP) are analyzed and formulated. The thermal resistance, operational velocity and the rate of latent heat transfer to the total are illustrated. The thermal resistance will increase with the replaced smaller diameter and the longer passage of PHP, however the rate of latent heat transfer to the total will decrease. When the capillary diameter is very small (the order of 0.3 mm), the thermal resistance is very sensitive to the diameter. The mechanism is concluded to be that, the PHP scale affects the thermal resistance by the flowing resistance. The temperature difference produces the driving force to balance the flowing resistance. The ratio of latent heat transfer to the total and the velocity depends on the temperature difference. The thermal resistance, the flowing resistance and the temperature difference influence one after another.