Abstract
This paper presents some experimental results of an extensive research on a novel oscillating heat pipe. The heat pipe is formed of three interconnected columns as different from the pulsating heat pipe designs. The dimensions of the heat pipe considered in this study are large enough to neglect the effect of capillary forces. Thus, the self-oscillation of the system is driven by the gravitational force and the phase lag between the evaporation and condensation processes. The overall heat transfer coefficient is found to be approximately constant irrespective of heat load for the experimental cases considered. The results are also compared with the previously published data by other investigators for water as the working fluid and for the same heat input range. The experimental data for the time variation of the liquid column heights and the vapor pressure are correlated algebraically, convenient for practical uses.
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Abbreviations
- a :
-
liquid column oscillation axis
- A h :
-
heater surface area
- b :
-
liquid column amplitude
- d :
-
diameter
- ℓc :
-
heat pipe height (Fig. 1)
- ℓd :
-
distance between the centerlines of evaporator and condenser (Fig. 1)
- ℓo :
-
distance between the centerlines of evaporator and free column (Fig. 1)
- ℓ1 :
-
temperature probe location (Fig. 1)
- ℓ2 :
-
temperature probe separation (Fig. 1)
- m :
-
total water mass
- P a , P b :
-
pressure amplitudes
- P o :
-
pressure oscillation axis
- P v :
-
instantaneous vapor pressure
- \( \ifmmode\expandafter\dot\else\expandafter\.\fi{Q}, \) Q :
-
heat input, heat load
- t :
-
time
- T :
-
temperature
- T ho :
-
time averaged heater temperature
- T co :
-
time averaged cooler temperature
- \( \ifmmode\expandafter\bar\else\expandafter\=\fi{T}_{{\text{h}}} \) :
-
time and space averaged heater temperature
- \( \ifmmode\expandafter\bar\else\expandafter\=\fi{T}_{{\text{c}}} \) :
-
time and space averaged cooler temperature
- U :
-
overall heat transfer coefficient
- z :
-
vertical coordinate, instantaneous liquid column heights
- ϕ :
-
phase lag
- ω :
-
radial frequency
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Özdemir, M. An experimental study on an oscillating loop heat pipe consisting of three interconnected columns. Heat Mass Transfer 43, 527–534 (2007). https://doi.org/10.1007/s00231-006-0128-4
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DOI: https://doi.org/10.1007/s00231-006-0128-4