LPT-2008-56 [BibTeX]
Yi Heng, Adel Mhamdi, S. Groß, A. Reusken, M. Buchholz, H. Auracher, Wolfgang Marquardt:
Reconstruction of local heat fluxes in pool boiling experiments along the entire boiling curve from high resolution transient temperature measurements
International Journal of Heat and Mass Transfer, 2008, 51, 5072-5087
Abstract:
In this paper, we consider a transient inverse heat conduction problem (IHCP) defined on an irregular
three-dimensional (3D) domain in pool boiling experiments. Heat input to a circular copper heater of
35 mm diameter and 7 mm thickness is provided by a resistance heating foil pressed to the bottom of
the heater. The heat flux at the inaccessible boiling side is estimated from a number of temperature readings
in the heater volume. These temperatures are measured by some high-resolution microthermocouples,
which are mounted 3.6 lm below the surface in the test heater. The IHCP is formulated as a
mathematical optimization problem and solved by the conjugate gradient (CG) method. The arising partial
differential equations (PDEs) are solved using the software package DROPS. A simulation case study is
used to validate the performance of the solution approach. Finally, we apply the solution approach to the
IHCP in pool boiling experiments. The procedure enables the reconstruction of local instantaneous heat
flux distribution on the heater surface at different locations along the boiling curve.
Keywords:
Inverse heat conduction problem, Pool boiling,Heat flux estimation, Conjugate gradient method Regularization, Microthermocouple