DOI: 10.1615/ICHMT.2017.CHT-7
ISBN Print: 9781-56700-4618
ISSN: 2578-5486
Heat Transfer in a Channel with Pin-Fins and Impingement
SINOPSIS
Pin-finned channels are commonly used in many heat exchange applications such as turbine
cooling and thermal management of electronics. Pin fins increase the surface area for cooling
and increase unsteadiness and turbulence that contribute to greater heat transfer. Another
commonly used heat exchange technique is impingement cooling where a series of
impingement holes are used to inject coolant on a facing plate. High heat transfer rates are
encountered at the impingement location. In this approach, however, the downstream jets are
adversely impacted by the crossflow. In this presentation we will first review the essential flow
and heat transfer physics of the pin-fin and impingement cooling configurations using Large
Eddy Simulations (LES) results as the data base for understanding the physics.
Combining pin-fins and impingement through innovative configurations may provide an
opportunity for overcoming the adverse crossflow impacts as well as synergistically benefiting
from both enhancement modalities. A new approach called incremental impingement has been
recently proposed that shelters the impingement jets immediately behind the pin-fins to
ameliorate the crossflow effects. The hole sizes and distributions can be used to tailor the heat
transfer rate distributions. Results from detailed LES simulations will be shown to quantify the
role of "sheltering" the jets and the effect of the hole sizes and their distributions.