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Experimental analyses of temperature and pressure oscillation frequencies of a flat plate pulsating heat pipe tested under various edge orientation angles and heat loads

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Abstract

A closed loop flat plate pulsating heat pipe, filled with OpteonTM SF33 (with a filling ratio of 50%), was experimentally studied in different orientations: 0° (horizontal), 22.5°, 45°, 67.5°, and 90° (“;edge”: vertical with horizontal channels). The results confirm the interest of such configurations, rarely investigated in the literature, on the thermal behavior of the device and on the regularity of the temperatures and pressure signals: If dried-out occurred in horizontal orientation, increase of inclination angle (starting from 22.5°) led to regular oscillatory movement due to help of gravity pressure drop between channels. The thermal performance remains very similar for the device inclination angles from 45° to 90°. Both FFT and wavelet analyses of the pressure signal and temperatures of the external wall of the device (measured with IR camera) were done to characterize the dominant oscillatory frequencies. These orientations led to dominant frequencies, rarely detected in the literature for other classic configurations (with vertical/inclined channels). Similar internal pressure and temperature signals both showed that the dominant frequency increases with decreasing angle (from edge to horizontal orientation), but also with increasing applied heat power, and finally tends to spread and disappear for the highest heat loads.

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Abbreviations

a :

Scaling factor

Bo :

Bond number

BHM:

Bottom heated mode

c:

Condenser

d :

Inter-channel distance (m)

D :

Diameter (m)

e:

Evaporator

f :

Frequency (Hz)

FFT:

Fast Fourier transform

FPPHP:

Flat plate pulsating heat pipe

FR:

Feeling ratio (%)

g :

Gravity acceleration (m/s2)

IR:

Infrared

l:

Liquid

P :

Pressure (Pa)

PSD:

Power spectrum density

Ȯ :

Heat power (W)

R th :

Thermal resistance (K/W)

t :

Time (s)

T :

Temperature (°C)

TC:

Thermocouple

v:

Vapor

W :

Wavelet transform

α:

Inclination angle (°)

η:

Dimensionless time

λ:

Thermal conductivity (W/(m-K))

ρ:

Density (kg/m3)

σ:

Surface tension (J/m2)

τ:

Time shift (s)

ψ:

Wavelet shape

ω0 :

Characteristic parameter

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Acknowledgements

This work has been pursued in the framework of the “Two-phase passive thermal devices for deployable space systems (TOPDESS)” project, financed through the Microgravity Application Program (Grant No. 4000128640) by the European Space Agency. Part of this work was also carried out by CIFRE convention (ANRT program) established between Pprime Institute (Poitiers) and Stellantis (Site de Carrières-sous-Poissy) with the OpenLab Fluidics.

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Authors and Affiliations

  1. Pprime Institute CNRS-ENSMA-Université de Poitiers, UPR 3346, Futuroscope-Chasseneuil, 86961, France

    Vincent Ayel, Thibault Van’t Veer, Maksym Slobodeniuk, Cyril Romestant & Yves Bertin

  2. Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/AI-43124, Parma, Italy

    Luca Pagliarini & Fabio Bozzoli

  3. Stellantis, Carrières sous Poissy, Carrières sous Poissy, 78955, France

    Thibault Van’t Veer

Authors
  1. Vincent Ayel
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  2. Luca Pagliarini
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  3. Thibault Van’t Veer
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  4. Maksym Slobodeniuk
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  5. Fabio Bozzoli
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  6. Cyril Romestant
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  7. Yves Bertin
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Correspondence to Vincent Ayel.

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Ayel, V., Pagliarini, L., Van’t Veer, T. et al. Experimental analyses of temperature and pressure oscillation frequencies of a flat plate pulsating heat pipe tested under various edge orientation angles and heat loads. Exp. Comput. Multiph. Flow (2024). https://doi.org/10.1007/s42757-023-0178-6

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  • DOI: https://doi.org/10.1007/s42757-023-0178-6

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