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The enhancement of heat transfer in the tail pipe of a pulse combustor

Lundgren, Ebbe LU ; Marksten, Ulrik and Möller, Sven-Inge LU (1998) TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION In TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION 1 & 2. p.3215-3220
Abstract
For pulse combustors of the Helmholtz type, a heat transfer of the order two to five times higher than expected has been reported. Experiments, where the temperature profile in the tail pipe of a pulse combustor has been measured, give Ilo indication why the heat transfer should be enhanced. The interaction between the oscillating velocity field and the oscillating temperature field might explain the observed enhanced heat conduction.

In order to examine this interaction, a thermomechanical pulsating flow between two parallel plates has been considered. The governing equations were coupled with the classical constitutive assumptions of linearly viscous fluid and Fourier's law for heat conduction. The pressure and temperature... (More)
For pulse combustors of the Helmholtz type, a heat transfer of the order two to five times higher than expected has been reported. Experiments, where the temperature profile in the tail pipe of a pulse combustor has been measured, give Ilo indication why the heat transfer should be enhanced. The interaction between the oscillating velocity field and the oscillating temperature field might explain the observed enhanced heat conduction.

In order to examine this interaction, a thermomechanical pulsating flow between two parallel plates has been considered. The governing equations were coupled with the classical constitutive assumptions of linearly viscous fluid and Fourier's law for heat conduction. The pressure and temperature gradients in the axial direction were approximated as harmonically oscillating functions in time, where the coefficients were estimated from experimental data. By neglecting the viscous net power term in the energy balance equation, the postulated general equations of motion were solved analytically in the transversal direction. The solutions obtained for the velocity and temperature fields were found to be in good agreement with experimental results.



The analytical expression for the temperature field was then used to determine the heal transfer at the plates. The heat transfer at the plates was found to be dependent on the phase difference between the pressure and temperature gradients. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION
editor
Burgess, AR; Dryer, FL; and
volume
1 & 2
pages
3215 - 3220
publisher
COMBUSTION INSTITUTE, 5001 BAUM BLVD, SUITE 635, PITTSBURGH, PA 15213-1851 USA
conference name
TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION
external identifiers
  • other:IDS Number: BN87V
  • scopus:0032262699
language
English
LU publication?
yes
id
e1278d6a-7ee4-4357-aed8-531c931af02e (old id 1367127)
date added to LUP
2009-04-07 11:06:34
date last changed
2017-06-11 04:57:35
@inproceedings{e1278d6a-7ee4-4357-aed8-531c931af02e,
  abstract     = {For pulse combustors of the Helmholtz type, a heat transfer of the order two to five times higher than expected has been reported. Experiments, where the temperature profile in the tail pipe of a pulse combustor has been measured, give Ilo indication why the heat transfer should be enhanced. The interaction between the oscillating velocity field and the oscillating temperature field might explain the observed enhanced heat conduction.<br/><br>
In order to examine this interaction, a thermomechanical pulsating flow between two parallel plates has been considered. The governing equations were coupled with the classical constitutive assumptions of linearly viscous fluid and Fourier's law for heat conduction. The pressure and temperature gradients in the axial direction were approximated as harmonically oscillating functions in time, where the coefficients were estimated from experimental data. By neglecting the viscous net power term in the energy balance equation, the postulated general equations of motion were solved analytically in the transversal direction. The solutions obtained for the velocity and temperature fields were found to be in good agreement with experimental results.<br/><br>
<br/><br>
The analytical expression for the temperature field was then used to determine the heal transfer at the plates. The heat transfer at the plates was found to be dependent on the phase difference between the pressure and temperature gradients.},
  author       = {Lundgren, Ebbe and Marksten, Ulrik and Möller, Sven-Inge},
  booktitle    = {TWENTY-SEVENTH SYMPOSIUM (INTERNATIONAL) ON COMBUSTION},
  editor       = {Burgess, AR and Dryer, FL},
  language     = {eng},
  pages        = {3215--3220},
  publisher    = {COMBUSTION INSTITUTE, 5001 BAUM BLVD, SUITE 635, PITTSBURGH, PA 15213-1851 USA},
  title        = {The enhancement of heat transfer in the tail pipe of a pulse combustor},
  volume       = {1 & 2},
  year         = {1998},
}