Heat-transfer enhancement by adaptive reorientation of flow fields

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

Uittreksel

Scope is enhancement of scalar transport (heat, chemical species) in engineered flow systems by reorientations of a laminar base flow. Practical applications include mixing in inline heat exchangers by downstream reorientation of baffles, stirring in bio-reactors by cyclic repositioning of impellers, and subsurface chemicals distribution for in situ minerals mining by unsteady pumping schemes. Conventional reorientation schemes consist of a periodic reorientation (in space or time) of the flow designed to accomplish efficient fluid mixing. However, whether this approach indeed yields optimal scalar transport for significant diffusion and/or chemical reactions is unclear. The present study explores an alternative approach: adaptive reorientation of the flow by interval-wise selection of the reorientation that is predicted to yield optimal scalar transport for a future time horizon. Key enabler for fast predictions is a compact model based on the spectral decomposition of the scalar evolution in the base
flow. The adaptive reorientation scheme is investigated for a representative problem: enhanced heating of a cold fluid in a 2D circular domain by an unsteady flow driven by step-wise activation of moving boundary segments. This reveals that the adaptive reorientation scheme can substantially accelerate
the heating compared to conventional time-periodic reorientation designed for efficient mixing and thus demonstrates its potential for attaining optimal scalar transport in reoriented flows.
Originele taal-2Engels
TitelProceedings 5th Thermal and Fluids Engineering Conference (TFEC), April 5–8, 2020, New Orleans, LA, USA
StatusGeaccepteerd/In druk - 2020
Evenement5th Thermal and Fluids Engineering Conference (TFEC) - New Orleans, Verenigde Staten van Amerika
Duur: 5 apr 20208 apr 2020

Congres

Congres5th Thermal and Fluids Engineering Conference (TFEC)
LandVerenigde Staten van Amerika
StadNew Orleans
Periode5/04/208/04/20

Vingerafdruk

flow field
heat transfer
baseflow
heating
fluid
laminar flow
unsteady flow
chemical reaction
bioreactor
pumping
decomposition
mineral
prediction
chemical

Citeer dit

Lensvelt, R., Speetjens, M., & Nijmeijer, H. (Geaccepteerd/In druk). Heat-transfer enhancement by adaptive reorientation of flow fields. In Proceedings 5th Thermal and Fluids Engineering Conference (TFEC), April 5–8, 2020, New Orleans, LA, USA
Lensvelt, Ruud ; Speetjens, Michel ; Nijmeijer, Henk. / Heat-transfer enhancement by adaptive reorientation of flow fields. Proceedings 5th Thermal and Fluids Engineering Conference (TFEC), April 5–8, 2020, New Orleans, LA, USA. 2020.
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title = "Heat-transfer enhancement by adaptive reorientation of flow fields",
abstract = "Scope is enhancement of scalar transport (heat, chemical species) in engineered flow systems by reorientations of a laminar base flow. Practical applications include mixing in inline heat exchangers by downstream reorientation of baffles, stirring in bio-reactors by cyclic repositioning of impellers, and subsurface chemicals distribution for in situ minerals mining by unsteady pumping schemes. Conventional reorientation schemes consist of a periodic reorientation (in space or time) of the flow designed to accomplish efficient fluid mixing. However, whether this approach indeed yields optimal scalar transport for significant diffusion and/or chemical reactions is unclear. The present study explores an alternative approach: adaptive reorientation of the flow by interval-wise selection of the reorientation that is predicted to yield optimal scalar transport for a future time horizon. Key enabler for fast predictions is a compact model based on the spectral decomposition of the scalar evolution in the baseflow. The adaptive reorientation scheme is investigated for a representative problem: enhanced heating of a cold fluid in a 2D circular domain by an unsteady flow driven by step-wise activation of moving boundary segments. This reveals that the adaptive reorientation scheme can substantially acceleratethe heating compared to conventional time-periodic reorientation designed for efficient mixing and thus demonstrates its potential for attaining optimal scalar transport in reoriented flows.",
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Lensvelt, R, Speetjens, M & Nijmeijer, H 2020, Heat-transfer enhancement by adaptive reorientation of flow fields. in Proceedings 5th Thermal and Fluids Engineering Conference (TFEC), April 5–8, 2020, New Orleans, LA, USA., New Orleans, Verenigde Staten van Amerika, 5/04/20.

Heat-transfer enhancement by adaptive reorientation of flow fields. / Lensvelt, Ruud; Speetjens, Michel; Nijmeijer, Henk.

Proceedings 5th Thermal and Fluids Engineering Conference (TFEC), April 5–8, 2020, New Orleans, LA, USA. 2020.

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

TY - GEN

T1 - Heat-transfer enhancement by adaptive reorientation of flow fields

AU - Lensvelt, Ruud

AU - Speetjens, Michel

AU - Nijmeijer, Henk

PY - 2020

Y1 - 2020

N2 - Scope is enhancement of scalar transport (heat, chemical species) in engineered flow systems by reorientations of a laminar base flow. Practical applications include mixing in inline heat exchangers by downstream reorientation of baffles, stirring in bio-reactors by cyclic repositioning of impellers, and subsurface chemicals distribution for in situ minerals mining by unsteady pumping schemes. Conventional reorientation schemes consist of a periodic reorientation (in space or time) of the flow designed to accomplish efficient fluid mixing. However, whether this approach indeed yields optimal scalar transport for significant diffusion and/or chemical reactions is unclear. The present study explores an alternative approach: adaptive reorientation of the flow by interval-wise selection of the reorientation that is predicted to yield optimal scalar transport for a future time horizon. Key enabler for fast predictions is a compact model based on the spectral decomposition of the scalar evolution in the baseflow. The adaptive reorientation scheme is investigated for a representative problem: enhanced heating of a cold fluid in a 2D circular domain by an unsteady flow driven by step-wise activation of moving boundary segments. This reveals that the adaptive reorientation scheme can substantially acceleratethe heating compared to conventional time-periodic reorientation designed for efficient mixing and thus demonstrates its potential for attaining optimal scalar transport in reoriented flows.

AB - Scope is enhancement of scalar transport (heat, chemical species) in engineered flow systems by reorientations of a laminar base flow. Practical applications include mixing in inline heat exchangers by downstream reorientation of baffles, stirring in bio-reactors by cyclic repositioning of impellers, and subsurface chemicals distribution for in situ minerals mining by unsteady pumping schemes. Conventional reorientation schemes consist of a periodic reorientation (in space or time) of the flow designed to accomplish efficient fluid mixing. However, whether this approach indeed yields optimal scalar transport for significant diffusion and/or chemical reactions is unclear. The present study explores an alternative approach: adaptive reorientation of the flow by interval-wise selection of the reorientation that is predicted to yield optimal scalar transport for a future time horizon. Key enabler for fast predictions is a compact model based on the spectral decomposition of the scalar evolution in the baseflow. The adaptive reorientation scheme is investigated for a representative problem: enhanced heating of a cold fluid in a 2D circular domain by an unsteady flow driven by step-wise activation of moving boundary segments. This reveals that the adaptive reorientation scheme can substantially acceleratethe heating compared to conventional time-periodic reorientation designed for efficient mixing and thus demonstrates its potential for attaining optimal scalar transport in reoriented flows.

KW - scalar transport

KW - chaotic advection

KW - thermal control

M3 - Conference contribution

BT - Proceedings 5th Thermal and Fluids Engineering Conference (TFEC), April 5–8, 2020, New Orleans, LA, USA

ER -

Lensvelt R, Speetjens M, Nijmeijer H. Heat-transfer enhancement by adaptive reorientation of flow fields. In Proceedings 5th Thermal and Fluids Engineering Conference (TFEC), April 5–8, 2020, New Orleans, LA, USA. 2020