SwePub
Sök i LIBRIS databas

  Utökad sökning

id:"swepub:oai:DiVA.org:mdh-53307"
 

Sökning: id:"swepub:oai:DiVA.org:mdh-53307" > Numerical Modelling...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004113nam a2200361 4500
001oai:DiVA.org:mdh-53307
003SwePub
008210202s2021 | |||||||||||000 ||eng|
020 a 9789174854978q print
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-533072 URI
040 a (SwePub)mdh
041 a engb eng
042 9 SwePub
072 7a vet2 swepub-contenttype
072 7a lic2 swepub-publicationtype
1001 a Rabhi, Achref,d 1991-u Mälardalens universitet,Framtidens energi,Simulation and Optimisation for Future Industrial Applications (SOFIA)4 aut0 (Swepub:mdh)ari03
2451 0a Numerical Modelling of Subcooled Nucleate Boiling for Thermal Management Solutions Using OpenFOAM
264 1a Västerås :b Mälardalen University,c 2021
300 a 146 s.
338 a electronic2 rdacarrier
520 a Two-phase cooling solutions employing subcooled nucleate boiling flows e.g. thermosyphons, have gained a special interest during the last few decades. This interest stems from their enhanced ability to remove extremely high heat fluxes, while keeping a uniform surface temperature. Consequently, modelling and predicting boiling flows is very important, in order to optimise the two-phase cooling operation and to increase the involved heat transfer coefficients. In this work, a subcooled boiling model is implemented in the open-source code OpenFOAM to improve and extend its existing solver reactingTwoPhaseEulerFoam dedicated to model boiling flows. These flows are modelled using Computational Fluid Dynamics (CFD) following the Eulerian two-fluid approach. The simulations are used to evaluate and analyse the existing Active Nucleation Site Density (ANSD) models in the literature. Based on this evaluation, the accuracy of the CFD simulations using existing boiling sub-models is determined, and features leading to improve this accuracy are highlighted. In addition, the CFD simulations are used to perform a sensitivity analysis of the interfacial forces acting on bubbles during boiling flows. Finally, CFD simulation data is employed to study the Onset of Nucleate Boiling (ONB) and to propose a new model for this boiling sub-model, with an improved prediction accuracy and extended validity range.It is shown in this work that predictions associated with existing boiling sub-models are not accurate, and such sub-models need to take into account several convective boiling quantities to improve their accuracy. These quantities are the thermophysical properties of the involved materials, liquid and vapour thermodynamic properties and the heated surface micro-structure properties. Regarding the interfacial momentum transfer, it is shown that all the interfacial forces have considerable effects on boiling, except the lift force, which can be neglected without influencing the simulations' output. The new proposed ONB model takes into account convective boiling features, and it able to predict the ONB with a very good accuracy with a standard deviation of 2.7% or 0.1 K. This new ONB model is valid for a wide range of inlet Reynolds numbers, covering both regimes, laminar and turbulent, and a wide range of inlet subcoolings and applied heat fluxes.
653 a Computational Fluid Dynamics
653 a Boiling Flows
653 a Two-phase cooling
653 a Energy- and Environmental Engineering
653 a energi- och miljöteknik
7001 a Bel Fdhila, Rebei,c Professoru Mälardalens högskola, Framtidens energi4 ths0 (Swepub:mdh)rba02
7001 a Kyprianidis, Konstantinos,c Professoru Mälardalens högskola, Framtidens energi4 ths0 (Swepub:mdh)kks01
7001 a Aslanidou, Ioannau Mälardalens universitet,Innovation och produktrealisering4 ths0 (Swepub:mdh)iau01
7001 a Duwig, Christophe,c Associate Professoru KTH Royal Institute of Technology4 opn
7102 a Mälardalens universitetb Framtidens energi4 org
8564 u https://mdh.diva-portal.org/smash/get/diva2:1525003/FULLTEXT02.pdfx primaryx Raw objecty fulltext
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-53307

Hitta via bibliotek

Till lärosätets databas

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy