This paper presents the results on an experimental activity on a single turned Pulsating Heat Pipe (PHP) with flexible pipes of internal diameter 2 mm by using ethanol as working fluid. The results of the activity are compared with other results obtained in the literature with rigid pipes. The flexible pipes does not influence so much the performances of a PHP vertically oriented, but present lower thermal resistances at high input powers. The natural lack of symmetry of a flexible PHP generates oscillations which are not exactly centered at the middle of the evaporator and the slugs can reach the condenser with lower amplitude oscillations. These device allow to understand the role of the pressure drop and the distance between evaporator and condenser on the instability insurgence in the these loops
THE EFFECT OF FLEXIBLE PIPES ON THE INSTABILITIES OF A SINGLE TURNED PHP
FILIPPESCHI, SAURO;
2012-01-01
Abstract
This paper presents the results on an experimental activity on a single turned Pulsating Heat Pipe (PHP) with flexible pipes of internal diameter 2 mm by using ethanol as working fluid. The results of the activity are compared with other results obtained in the literature with rigid pipes. The flexible pipes does not influence so much the performances of a PHP vertically oriented, but present lower thermal resistances at high input powers. The natural lack of symmetry of a flexible PHP generates oscillations which are not exactly centered at the middle of the evaporator and the slugs can reach the condenser with lower amplitude oscillations. These device allow to understand the role of the pressure drop and the distance between evaporator and condenser on the instability insurgence in the these loopsI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
