Transport phenomenon in a jet type mold cooling pipe

Abstract

The problem with jet type mold cooling pipes is that the heat transfer and flow pattern becomes unclear near the end of the cooling pipe, i.e. in the region where the jet impinges on the cooling pipe. This research examined transport phenomena characteristics in jet cooling pipes, using channels with the same shape as the actual cooling pipe. In this study, the aim was to elucidate transport phenomena in a jet type mold cooling pipe. This was achieved by conducting flow visualization and measurement of the mass transfer coefficient using a cooling pipe with the same shape as that actually used for mold cooling, and predicting heat transfer based on analogy. The heat transfer coefficients were inferred from Sh numbers by using the analogy between mass transfer and heat transfer. The heat transfer coefficient showed almost the same behavior as the flow pattern, and tendencies similar to previous research were exhibited at the stagnation point.

Experimental and Numerical Investigations into Heat Transfer Using a Jet Cooler in High-Pressure Die Casting

“…Kawahara and Nishimura [9] predicted the convective HTC based on an analogy with the mass transfer coefficient obtained from the current passing through an electrolyte solution and multiple electrodes positioned around the hemispherical tip of the jet cooling pipe. In addition, the model was made of acrylic resin to facilitate the flow visualization of the working fluid with the aluminum powder.…”