Abstract
The rising demand for efficient cooling technologies is a strong driver of extensive research in this area. This trend is particularly strong in turbines and microprocessors technology. Presented study is focused on the jet impingement cooling concept, which is used in various configurations for many years. The potential of the heat sink shape modification is not yet fully explored. Available literature suggests that average Nusselt number can be improved by more than 10% by adding conical shape in the stagnation region. This refers to the axisymmetric case where cold-water jet impinges the surface of heated aluminium. Presented results are based on 2D axisymmetric thermal-FSI (Fluid-Solid Interaction) model, which was validated against the experiment. The objective of the presented analysis is to determine the correlation between cooling effectiveness (Nusselt number) and chosen examples of concave and convex shapes located in the jet stagnation area.
Highlights
It is well known, that jet impingement technology is one of the most effective cooling techniques, widely used in gas turbines and electronic devices
The main objective of them is the intensification of heat transfer between the hot solid and coolant
Available literature contains many examples of experiments [1,2] which are focused on the cooling enhancement by enlarging heat exchange area
Summary
It is well known, that jet impingement technology is one of the most effective cooling techniques, widely used in gas turbines and electronic devices. The main objective of them is the intensification of heat transfer between the hot solid and coolant. Available literature contains many examples of experiments [1,2] which are focused on the cooling enhancement by enlarging heat exchange area. An alternative approach is based on flow instability induction, leading to the phenomena of nonstationary heat exchange [3]. Numerical simulations techniques were recently introduced [4,5] to extend the understanding of numerous experiments. One of the most promising approaches is thermal-FSI, which is based on fluid and solid simulations [4]. The advantage of thermal-FSI model is a proper micro/nanoscale description of heat transfer phenomena across the boundary between fluid and solid [5,6]. Kraszewski [7] used this approach to study the transient thermal effort of Y-pipe installed in 400 MW steam power plant
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