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
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.
Pool boiling, parameter estimation, two-phase flow, constitution.