Transient heat transfer for the cooling of PVC tubes using water jet

摘要

Transient heat transfer of a PVC tube using a water jet is investigated experimentally. The spread of water film on the tube surface is visualized using a digital camera. The spread of the water film at the outer surface of the tube improves as the jet flow rate increases up to a certain limit where a further increase in the jet speed causes water to scatter at the tube top surface. Using a single water jet shows a satisfactory cooling performance where a single jet of about 3 mm can cool about 120 mm length of the tube. PVC tube production rate characterized by tube speed is calculated and presented based on the film spread and time constant.