ライブラリ登録: Guest
ICHMT DL ホーム 今年 アーカイブ 執行委員会 熱・物質移動国際センター

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

DOI: 10.1615/ICHMT.2008.CHT.1720
10 pages

Sid'Ahmed Ould Ahmedou
UMR GEPEA (UMR CNRS 6144), ENITIAA, BP 82225, 44322 Nantes Cedex 03, France

Alain Le Bail
UMR GEPEA (UMR CNRS 6144), ENITIAA, BP 82225, 44322 Nantes Cedex 03, France

Michel Havet
GEPEA, ONIRIS – Site de la Geraudiere, Nantes, France

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.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH