Thermally responsive particles in Rayleigh-Bénard convection

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

We track particles that experience both mechanical and thermal inertia in direct numerical simulations of Rayleigh-Bénard convection (RBC), a fluid layer heated from below and cooled from above. Both particles and fluid exhibit thermal expansion. The particles have a larger thermal expansion coefficient than the fluid, such that particles become lighter than the fluid near the hot bottom plate and heavier than the fluid near the cold top plate. First we investigate how the dynamics of thermal expansion affect the distribution of particles in the RBC cell. We find a regime of viscous and thermal response times where the concentration of particles at the plates is enhanced. A particle deposited on a plate re-suspends after a characteristic residence time, that depends on the thermal response time. Now that we found a mechanism driving particles towards the plates, while also enforcing a motion back to the bulk, we include mechanical and thermal two-way coupling and investigate how thermally responsive particles affect flow structures and heat transfer in RBC. Ultimately, we want to explore the possibility to enhance heat transfer using these thermally inertial particles.
LanguageEnglish
Title of host publicationTurbulent Cascades II
Subtitle of host publicationProceedings of the Euromech-ERCOFTAC Colloquium 589
EditorsM. Gorokhovski, F.S. Godeferd
Place of PublicationCham
PublisherSpringer
Pages227-235
Number of pages9
ISBN (Electronic)978-3-030-12547-9
ISBN (Print)978-3-030-12546-2
DOIs
StatePublished - 2019
EventEuromech-ERCOFTAC Colloquium “Turbulent Cascades II”: Colloquium 589 - LMFA laboratory in the Ecole Centrale, Lyon, France
Duration: 5 Dec 20177 Dec 2017

Publication series

NameERCOFTAC Series
Volume26
ISSN (Print)1382-4309
ISSN (Electronic)2215-1826

Conference

ConferenceEuromech-ERCOFTAC Colloquium “Turbulent Cascades II”
CountryFrance
CityLyon
Period5/12/177/12/17

Fingerprint

Rayleigh-Benard convection
fluids
thermal expansion
heat transfer
convection cells
particle tracks
direct numerical simulation
inertia

Cite this

Alards, K., Kunnen, R., Clercx, H., & Toschi, F. (2019). Thermally responsive particles in Rayleigh-Bénard convection. In M. Gorokhovski, & F. S. Godeferd (Eds.), Turbulent Cascades II: Proceedings of the Euromech-ERCOFTAC Colloquium 589 (pp. 227-235). (ERCOFTAC Series; Vol. 26). Cham: Springer. DOI: 10.1007/978-3-030-12547-9_24
Alards, Kim ; Kunnen, Rudie ; Clercx, Herman ; Toschi, Federico. / Thermally responsive particles in Rayleigh-Bénard convection. Turbulent Cascades II: Proceedings of the Euromech-ERCOFTAC Colloquium 589. editor / M. Gorokhovski ; F.S. Godeferd. Cham : Springer, 2019. pp. 227-235 (ERCOFTAC Series).
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abstract = "We track particles that experience both mechanical and thermal inertia in direct numerical simulations of Rayleigh-B{\'e}nard convection (RBC), a fluid layer heated from below and cooled from above. Both particles and fluid exhibit thermal expansion. The particles have a larger thermal expansion coefficient than the fluid, such that particles become lighter than the fluid near the hot bottom plate and heavier than the fluid near the cold top plate. First we investigate how the dynamics of thermal expansion affect the distribution of particles in the RBC cell. We find a regime of viscous and thermal response times where the concentration of particles at the plates is enhanced. A particle deposited on a plate re-suspends after a characteristic residence time, that depends on the thermal response time. Now that we found a mechanism driving particles towards the plates, while also enforcing a motion back to the bulk, we include mechanical and thermal two-way coupling and investigate how thermally responsive particles affect flow structures and heat transfer in RBC. Ultimately, we want to explore the possibility to enhance heat transfer using these thermally inertial particles.",
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Alards, K, Kunnen, R, Clercx, H & Toschi, F 2019, Thermally responsive particles in Rayleigh-Bénard convection. in M Gorokhovski & FS Godeferd (eds), Turbulent Cascades II: Proceedings of the Euromech-ERCOFTAC Colloquium 589. ERCOFTAC Series, vol. 26, Springer, Cham, pp. 227-235, Euromech-ERCOFTAC Colloquium “Turbulent Cascades II”, Lyon, France, 5/12/17. DOI: 10.1007/978-3-030-12547-9_24

Thermally responsive particles in Rayleigh-Bénard convection. / Alards, Kim; Kunnen, Rudie; Clercx, Herman; Toschi, Federico.

Turbulent Cascades II: Proceedings of the Euromech-ERCOFTAC Colloquium 589. ed. / M. Gorokhovski; F.S. Godeferd. Cham : Springer, 2019. p. 227-235 (ERCOFTAC Series; Vol. 26).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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N2 - We track particles that experience both mechanical and thermal inertia in direct numerical simulations of Rayleigh-Bénard convection (RBC), a fluid layer heated from below and cooled from above. Both particles and fluid exhibit thermal expansion. The particles have a larger thermal expansion coefficient than the fluid, such that particles become lighter than the fluid near the hot bottom plate and heavier than the fluid near the cold top plate. First we investigate how the dynamics of thermal expansion affect the distribution of particles in the RBC cell. We find a regime of viscous and thermal response times where the concentration of particles at the plates is enhanced. A particle deposited on a plate re-suspends after a characteristic residence time, that depends on the thermal response time. Now that we found a mechanism driving particles towards the plates, while also enforcing a motion back to the bulk, we include mechanical and thermal two-way coupling and investigate how thermally responsive particles affect flow structures and heat transfer in RBC. Ultimately, we want to explore the possibility to enhance heat transfer using these thermally inertial particles.

AB - We track particles that experience both mechanical and thermal inertia in direct numerical simulations of Rayleigh-Bénard convection (RBC), a fluid layer heated from below and cooled from above. Both particles and fluid exhibit thermal expansion. The particles have a larger thermal expansion coefficient than the fluid, such that particles become lighter than the fluid near the hot bottom plate and heavier than the fluid near the cold top plate. First we investigate how the dynamics of thermal expansion affect the distribution of particles in the RBC cell. We find a regime of viscous and thermal response times where the concentration of particles at the plates is enhanced. A particle deposited on a plate re-suspends after a characteristic residence time, that depends on the thermal response time. Now that we found a mechanism driving particles towards the plates, while also enforcing a motion back to the bulk, we include mechanical and thermal two-way coupling and investigate how thermally responsive particles affect flow structures and heat transfer in RBC. Ultimately, we want to explore the possibility to enhance heat transfer using these thermally inertial particles.

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Alards K, Kunnen R, Clercx H, Toschi F. Thermally responsive particles in Rayleigh-Bénard convection. In Gorokhovski M, Godeferd FS, editors, Turbulent Cascades II: Proceedings of the Euromech-ERCOFTAC Colloquium 589. Cham: Springer. 2019. p. 227-235. (ERCOFTAC Series). Available from, DOI: 10.1007/978-3-030-12547-9_24