Fraunhofer-Institut für Produktionsanlagen und Konstruktionstechnik IPK

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  • Publication
    Cooling Capacity of Oil-in-Water Emulsion under wet Machining Conditions
    ( 2023)
    Nabbout, Kaissar
    ;
    Sommerfeld, Martin
    ;
    Barth, Enrico
    ;
    Uhlmann, Eckart
    ;
    Bock-Marbach, Benjamin
    ;
    Kuhnert, Jörg
    Many industrial machining operations are carried out under wet machining conditions. Modelling and simulating fluid-structure-interactions and conjugate heat transfer are still a challenge nowadays. In this paper, temperature dependent heat transfer coefficients (HTC) h(T) are experimentally estimated for wet machining-like conditions in a jet cooling experiment. The transient temperature is thereby used to solve an Inverse Heat Transfer Problem for HTC function estimation. Determined HTC are applied as input in related jet cooling simulation using the Finite-Pointset-Method (FPM) to validate the modeling approach. Additionally, wet cutting simulations numerically highlight the influence of determined HTC h(T) on turning.
  • Publication
    Heat Transfer Study for Oil-in-Water Emulsion Jets Impinging onto hot Metal Surface
    ( 2022)
    Nabbout, Kaissar
    ;
    Pasternak, Lars
    ;
    Sommerfeld, M.
    ;
    Bock-Marbach, Benjamin
    ;
    Kuhnert, Jörg
    ;
    Barth, Enrico
    ;
    Uhlmann, Eckart
    The purpose of this work is to analyse numerically as well as experimentally liquid jets impinging at different angles (30°, 60° and 90°) and different velocities (4.7 m/s, 7.0 m/s and 9.7 m/s) onto a hot circular plate made of Inconel 718. Liquids used in the experiments are water and oil-in-water emulsion with 8% concentration of the mineral oil Adrana AY 401 from Houghton Deutschland GmbH. An infrared camera is used to measure the black-coated rear face of the plate during the jet cooling process. The temperature field obtained is then used as input to estimate the heat transfer coefficient. The heat transfer coefficient is estimated by solving an Inverse Heat Transfer Problem (IHTP). In addition, the transient growth of the wetting area is also shown for both liquids. The heat transfer coefficient obtained from the experiments are utilised as input in numerical simulations with the Finite-Pointset-Method (FPM). Comparison between experiments and simulations is done to validate the recently implemented evaporation modelling in the MESHFREE software.