5-8 September 2022
Wyndham Grand Salzburg Conference Center
Europe/Vienna timezone

Applying the ANSYS GEKO turbulence model to simulate the heat transfer of impinging jets in continuous heat treatment lines

7 Sep 2022, 09:50
25m
Room 1

Room 1

Oral Presentation Modelling and simulation of thermal and surface engineering processes HEAT TREATMENT

Speaker

Jan Erik MENZLER (RWTH Aachen University - Department for Industrial Furnaces and Heat Engineering)

Description

Impingement jets are widely applied in industrial cooling and drying processes. In continuous heat treatment lines of aluminium and steel strips impingement jets are used to achieve rapid cooling in the according sections. The heat transfer coefficient depends on the flow but also on the geometric parameters such as nozzle to strip distance and nozzle shape. Various nozzle shapes, slot nozzles, round nozzles or combinations of both are used to design those cooling sections. The key challenge while designing such cooling sections is to determine the performance or the heat transfer coefficient respectively.

Jet cooling sections are challenging to model with either computational fluid dynamics or in an experimental set up. In industrial lines the flow exits the nozzle with velocities up to 160 m/s and the cooling sections can be multiple meters in width and length. After exiting the nozzles, the jets are redirected when impinging the strip and again when meeting each other half-way between the nozzles. Those flow characteristics are challenging to model due to both the high velocities and velocity gradients but also the need to resolve the boundary layer to determine the local heat transfer characteristics.

RANS-turbulence models are a cost-effective way to determine heat transfer coefficients and enable the investigation of bigger scale problems such as the cooling sections to a certain accuracy. In this work the capability of the ANSYS generalized k-omega (GEKO) two equation turbulence model to determine the local and integral heat transfer coefficients of impingement jets is evaluated. The results are contrasted to other turbulence models as well as experimental investigations. The local and integral heat transfer coefficients are investigated in dependence of both the nozzle to strip distances and the nozzle exit velocities.

Register for the Tom Bell Young Author Award (TBYAA)? Yes
Speaker Country Germany

Primary author

Jan Erik MENZLER (RWTH Aachen University - Department for Industrial Furnaces and Heat Engineering)

Co-authors

Mr Maximilian SCHLEUPEN (RWTH Aachen University - Department for Industrial Furnaces and Heat Engineering) Mr Dominik BÜSCHGENS (RWTH Aachen University - Department for Industrial Furnaces and Heat Engineering) Prof. Herbert PFEIFER (RWTH Aachen University - Department for Industrial Furnaces and Heat Engineering) Moritz KLUSMANN (WSP GmbH)

Presentation Materials

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