Abstract
Heat transport in impinging jets makes a part of many experimental and numerical studies because some similarities can be identified between a pure impingement jet and industrial processes like, for example, the heat transfer at the bottom of an agitated vessel. In this paper, experimental results based on measuring the response to heat flux oscillations applied to the heat transfer surface are compared with CFD simulations. The computational cost of a LES-based approach is usually too high therefore a comparison with less computationally expensive RANS-based turbulence models is made in this paper and a possible improvement of implementing an anisotropic explicit algebraic model for the turbulent heat flux model is evaluated.
Highlights
Impinging jets are frequently used in industrial processes because high heat transfer intensities can be achieved at relatively small surfaces
Turbulence models like, for example, Spalart-Allmaras, k− ε and k − ω are based on this approach and using a set of another equations, quantities like turbulence kinetic energy k and energy dissipation ε are described and the turbulent viscosity is expressed as a scalar value
The heat transfer coefficient in an impinging jet was measured on a circular plate with diameter 500 mm and thickness 1 mm
Summary
Impinging jets are frequently used in industrial processes because high heat transfer intensities can be achieved at relatively small surfaces. A lot of experimental, numerical and analytical data concerning the hydrodynamics and heat or mass transfer in impinging jets can be found in the literature, mainly in a configuration where the fluid (liquid) jet impinges a smooth plane surface. In CFD simulations of an impinging jet, the computational cost of LES-based or DNS-based approach is usually too high less computationally expensive RANSbased (Reynolds averaged Navier-Stokes equation) turbulence models [1] are more frequently used in practise. With a RANS-based approach, the Reynolds stress tensor in the time-averaged Navier-Stokes equation must be described by some turbulence model.
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