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Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement

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Title Flow-induced deformation of a flexible thin structure as manifestation of heat transfer enhancement
 
Creator SOTI, AK
BHARDWAJ, R
SHERIDAN, J
 
Subject FLUID-STRUCTURE INTERACTION
IMMERSED BOUNDARY METHOD
NAVIER-STOKES EQUATIONS
FORCED-CONVECTION
VORTEX GENERATORS
STRIP INSERTS
CROSS-FLOW
CHANNEL
CYLINDER
TEMPERATURE
Fluid-structure interaction (FSI)
Flow-induced deformation
Heat transfer enhancement
Immersed boundary method
 
Description Flow-induced deformation of thin flexible structures coupled with convective heat transfer has potential applications in energy harvesting and is important for understanding functioning of several biological systems. We numerically demonstrate large-scale flow-induced deformation as an effective passive heat transfer enhancement technique. An in-house, strongly-coupled fluid-structure interaction (FSI) solver is employed in which flow and structure solvers are based on sharp-interface immersed boundary and finite element method, respectively. In the present work, we validate convective heat transfer module of the in-house FSI solver against several benchmark examples of conduction and convective heat transfer including moving structure boundaries. The thermal augmentation is investigated as well as quantified for the flow-induced deformation of an elastic thin plate attached to lee side of a rigid cylinder in a heated channel laminar flow. We show that the wake vortices past the plate sweep higher sources of vorticity generated on the channel walls out into the high velocity regions - promoting the mixing of the fluid. The self-sustained motion of the plate assists in convective mixing, augmenting convection in bulk and near the walls; and thereby reducing thermal boundary layer thickness as well as improving Nusselt number at the channel walls. We quantify the thermal improvement with respect to channel flow without any bluff body and analyze the role of Reynolds number, Prandtl number and material properties of the plate in the thermal augmentation. (C) 2015 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2016-01-14T13:53:11Z
2016-01-14T13:53:11Z
2015
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 84,1070-1081
0017-9310
1879-2189
http://dx.doi.org/10.1016/j.ijheatmasstransfer.2015.01.048
http://dspace.library.iitb.ac.in/jspui/handle/100/17663
 
Language en