LPT-2001-26 [BibTeX]
Torsten Lüttich, Wolfgang Marquardt, M. Buchholz, C. Hertel, H. Auracher:
Pool boiling at high heat fluxes II: modeling and identification of two phase flow characteristics close to the heater surface
In: D. Gorenflo, A. Luke (Eds.): International Refrigeration Conference Commission B1 - Thermophysical Properties and Transfer Processes of New Refrigerants, Paderborn, Germany, 3-5.10.2001
Abstract:
A new approach to the identification of momentum and mass transfer of the
two-phase flow very close to the
surface of a horizontal heater is presented combining both theoretical and experimental
investigations. In this approach, the two-phase flow perpendicular to the boiling
surface is described by a one-dimensional two-fluid model derived by dimensional
reduction. This model is the starting point to the
formulation of an inverse problem which aims at the identification of constitutive
equations to describe wetting and heat flux at steady-state boiling. The measurements
for the solution of the inverse problem are provided by a twin micro-optical probe to
measure local flow parameters like vapor fraction profiles in pool
boiling experiments. The identification of the model parameters in candidate
constitutive equations as well as the vapor fraction and velocity at the heater surface
is carried out exemplarily for an
operating point in steady state transition boiling of isopropanol.
Keywords:
Pool boiling, parameter estimation, two-phase flow, constitution.