Abstract

A study on the start-up phases of a capillary pumped loop for terrestrial application (CPLTA) is proposed in this paper. Experimental analysis and numerical modeling, using a one-dimensional spatial discretization model, based on thermohydraulic equations and solved by nodal network/electrical analogy, are presented to study the thermal and hydraulic behavior of the loop for methanol and n-pentane as working fluids, during start-up transient phases. The experimental observations are backed up by the numerical model to help the transient and steady analysis of this kind of loop. The precise numerical study allows to have a better understanding of the complicated phenomena happening during the start-up and to have a global view of the behavior of the capillary pumped loop for integrated power (CPLIP) during these phases. In this study, it will be also shown the influence of vapor line solid walls thermal inertia and its impact on the dynamic behavior and on the success of the start-up of the loop.

References

1.
Nikitkin
,
M.
, and
Cullimore
,
B.
,
1998
, “
CPL and LHP Technologies: What Are the Differences, What Are the Similarities
,”
SAE
Paper No. 981587.
2.
Maydanik
,
Y.
,
2005
, “
Loop Heat Pipes
,”
Appl. Therm. Eng.
,
25
(
5–6
), pp.
635
657
.
3.
Khairnasov
,
S.
, and
Naumova
,
A.
,
2015
, “
Heat Pipes Application in Electronics Thermal Control Systems
,”
Front. Heat Pipes
,
6
(
6
), epub.http://dx.doi.org/10.5098/fhp.6.6
4.
Dupont
,
V.
,
Oost
,
S. V. O.
,
Barremaecker
,
L.
, and
Nicolau
,
S.
,
2013
, “
Railways Qualification Tests of Capillary Pumped Loop on a Train
,”
17th International Heat Pipe Conference
, Kanpur, India, Oct. 13–17, pp.
311
318
.
5.
Lachassagne
,
L.
,
Bertin
,
Y.
,
Ayel
,
V.
, and
Romestant
,
C.
,
2013
, “
Steady-State Modelling of Capillary Pumped Loop in Gravity Field
,”
Int. J. Therm. Sci.
,
64
, pp.
62
80
.
6.
Vasiliev
,
L.
,
Lossouarn
,
D.
,
Romestant
,
C.
,
Alexandre
,
A.
,
Bertin
,
Y.
,
Piatsiushyk
,
Y.
, and
Romanenkov
,
V.
,
2009
, “
Loop Heat Pipes for Cooling of High-Power Electronic Components
,”
Int. J. Heat Transfer
,
52
(
1–2
), pp.
301
308
.
7.
Lossouarn
,
D.
,
2008
, “
Etude Théorique et Experimentale du Refroidissement Diphasique à Pompage Capillaire Des Convertisseurs de Puissance à Haute Densité de Flux de Chaleur Pour la Traction Ferroviaire
,” Ph.D. thesis, École doctorale des sciences pour l'ingénieur et aéronautique - SPI&A and Université de Poitiers, Poitiers, France.
8.
Ayel
,
V.
,
Lachassagne
,
L.
,
Bertin
,
Y.
,
Romestant
,
C.
, and
Lossouarn
,
D.
,
2011
, “
Experimental Analysis of a Capillary Pumped Loop for Terrestrial Application
,”
J. Thermophys. Heat Transfer
,
25
(
4
), pp.
561
571
.
9.
Lachassagne
,
L.
,
Ayel
,
V.
,
Romestant
,
C.
, and
Bertin
,
Y.
,
2012
, “
Experimental Study of Capillary Pumped Loop for Integrated Power in Gravity Field
,”
Appl. Therm. Eng.
,
35
, pp.
166
176
.
10.
Accorinti
,
F.
,
Ayel
,
V.
, and
Bertin
,
Y.
,
2019
, “
Steady-State Analysis of a Capillary Pumped Loop for Terrestrial Application With Methanol and Ethanol as Working Fluids
,”
Int. J. Therm. Sci.
,
137
, pp.
571
583
.
11.
Ayel
,
V.
,
Lachassage
,
L.
,
Bertin
,
Y.
, and
Romestant
,
C.
,
2012
, “
Experimental Study on the Effects of the Vapour Pressure Losses on a Capillary Pumped Loop for Terrestrial Applications
,”
16th International Heat Pipe Conference
, France, Lyon, May 20–24.
12.
Blet
,
N.
,
Bertin
,
Y.
,
Ayel
,
V.
,
Romestant
,
C.
, and
Platel
,
V.
,
2016
, “
Experimental Analysis of a Capillary Pumped Loop for Terrestrial Applications With Several Evaporators in Parallel
,”
Appl. Therm. Eng.
,
93
, pp.
1304
1312
.
13.
Kaled
,
A.
,
Dutour
,
S.
,
Platel
,
V.
, and
Lluc
,
J.
,
2015
, “
Experimental Study of a Capillary Pumped Loop for Cooling Power Electronics: Response to High Amplitude Heat Load Steps
,”
Appl. Therm. Eng.
,
89
, pp.
169
179
.
14.
Zhao
,
T. S.
, and
Liao
,
Q.
,
2000
, “
On Capillary-Driven Flow and Phase-Change Heat Transfer in a Porous Structure Heat by a Finned Surface: Measurements and Modeling
,”
Int. J. Heat Mass Transfer
,
43
(
7
), pp.
1141
1155
.
15.
Mottet
,
L.
,
Coquard
,
T.
, and
Prat
,
M.
,
2015
, “
Three Dimensional Liquid and Vapour Distribution in the Wick of Capillary Evaporators
,”
Int. J. Heat Mass Transfer
,
83
, pp.
636
651
.
16.
Figus
,
C.
,
Le Bray
,
Y.
,
Bories
,
S.
, and
Prat
,
M.
,
1999
, “
Heat and Mass Transfer With Phase Change in a Porous Structure Partially Heated: Continuum Model and Pore Network Simulations
,”
Int. J. Heat Mass Transfer
,
42
(
14
), pp.
2557
2569
.
17.
Blet
,
N.
,
Platel
,
V.
,
Ayel
,
V.
,
Bertin
,
Y.
, and
Romestant
,
C.
,
2016
, “
Transient Modeling of a Capillary Pumped Loop for Terrestrial Applications
,”
ASME J. Heat Transfer
,
138
(
7
), p.
072802
.
18.
Blet
,
N.
,
Ayel
,
V.
,
Bertin
,
Y.
,
Romestant
,
C.
, and
Platel
,
V.
,
2013
, “
Transient Modeling of CPL for Terrestrial Applications—Part A: Network Concept and Influence of Gravity on the CPL Behavior
,”
17th International Heat Pipe Conference
, Kanpur, India, Oct. 13–17, pp.
263
270
.
You do not currently have access to this content.