ETD system

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Tesi etd-04112019-234940


Thesis type
Tesi di laurea magistrale
Author
PERNA, ROBERTA
URN
etd-04112019-234940
Title
Characterization of a Pulsating Heat Pipe in a Microgravity Environment through a Wavelet Analysis
Struttura
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA AEROSPAZIALE
Supervisors
relatore Prof. Filippeschi, Sauro
correlatore Dott. Mameli, Mauro
correlatore Dott. Mariotti, Alessandro
Parole chiave
  • wavelet analysis
  • pulsating heat pipe
  • pressure signal
  • time-frequency analysis
Data inizio appello
30/04/2019;
Consultabilità
Secretata d'ufficio
Data di rilascio
30/04/2089
Riassunto analitico
Thermal control is a fundamental problem in spacecraft design, since a
space mission can fail catastrophically due to inadequate heat management.
To address heating issues, past work has given sharp attention to the Pulsating
Heat Pipe (PHP), a special kind of wickless heat pipe which is characterized
by oscillating/pulsating thermally induced
ow motion. The operation PHPs
are intrinsically unsteady, and therefore they need further investigation for the
development of reliable heat transfer models and robust design tools.
This thesis examines an operating PHP with the goal of understanding how
the amplitude and the frequencies of its oscillations vary, depending on the
pulsating heat pipe parameters. We describe the post-processing of the data
collected from a hybrid Pulsating Heat Pipe in microgravity conditions and
with varying heat load input. Through a wavelet analysis, we show that
the PHP oscillation frequency increases with increasing heat load input, as
experted from theoretical/phisical considerations.
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