Investigation of flow drag and forced convective heat transfer in perforated coolant channels

摘要

The present paper is to investigate the flow drag and forced convective heat transfer inside perforated coolant channels. The single blow, maximum-slope transient technique was applied for determining the heat transfer performance of perforated channel. A plate-type heater and a RTD thermosensor were introduced for improving the heat input and temperature measurement of the single blow technique. The test core consisted of a number of Aluminum plates separated by Plexiglas spacers to form several parallel flow channels. Various flow angles of hole arrangement were considered for various aspect ratios (b/w), inlet flow temperatures and Reynolds numbers in laminar, transitional and turbulent flow regimes. The measured fanning friction factor and Colburn heat transfer factor are presented. The present single blow technique covered the parameter ranges of Reynolds number 3.x 10~4 approx 5.5 x 10~5, heat input Q=85Wapprox7273W, plate porosity sigma = 0.126, and Pr=0.71.