Heating and partial cooling problems in unsteady forced convection
Laboratoire de Thermomécanique, UTAP, Faculté des Sciences,
51687 Reims Cedex 2, France
Accepted: 13 October 1998
Published online: 15 December 1998
The study of thermoconvective problems in a laminar external boundary layer flow is theoretically presented for both partial heating and cooling situations after that the fluid/wall system has already reached a first steady heating state. The 4th order Karman-Pohlhausen integral approach is used under the hypothesis that the thermal boundary layer thickness is assumed to be steady during the transient phase. The final mathematical equation for both cooling and heating problems is proposed and exemples of space and time corresponding thermograms are given.
PACS: 44.25.+f – Convective and constrained heat transfer
© EDP Sciences, 1998