ライブラリ登録: Guest
Proceedings of CHT-08 ICHMT International Symposium on Advances in Computational Heat Transfer
May, 11-16, 2008, Marrakesh, Morocco

DOI: 10.1615/ICHMT.2008.CHT


ISBN Print: 978-1-56700-253-9

ISSN: 2578-5486

INFLUENCE OF CORONA DISCHARGES ON THE CONVECTIVE HEAT TRANSFER IN A CHANNEL FLOW

page 10
DOI: 10.1615/ICHMT.2008.CHT.1720
Get accessGet access

要約

Convection is the major heat transfer mode in refrigerating and thermal food processes. Alternative processes should be investigated in order to enhance the heat transfer. If ElectroHydroDynamic augmentation of convective heat transfer received great interest, literature is rather poor concerning the EHD enhancement in channel flows. This work concerns the EHD enhancement of the convective heat transfer at the surface of a food located inside a horizontal channel. The food, laid on a grounded electrode, is submitted to the cross air flow and to the ionic wind produced by the corona discharge from a wire. The Coulombic force acting on the fluid is the main mechanism but other couplings are also taken into account. The model distinguishes two regions: the ionization area at the vicinity of the wire and the drift region. The governing equations, derived from the classical equations of fluid dynamics and electrodynamics, are solved (2 dimensional steady-state) in the drift region using Comsol Multiphysics®. Moreover an optimization procedure implemented in Matlab® is performed in order to accurately predict the electric field at the wire. In a first stage, we demonstrate the ability of the model to predict the electric field and the current density distribution at the grounded plate. In a second stage, our original approach is carried out to study the influence of the ionic wind on the main flow and on the convective heat transfer. We confirm that the electrical body force could generate vortices and flow disturbances inside the channel. The calculation of the local convective heat transfer coefficient reveals a large heterogeneity of this coefficient along the surface. Further investigations should concern experimental validation of the velocity field and measurements of the local heat transfer coefficient.

Begell Digital Portal Begellデジタルライブラリー 電子書籍 ジャーナル 参考文献と会報 リサーチ集 価格及び購読のポリシー Begell House 連絡先 Language English 中文 Русский Português German French Spain