Prediction of heat transfer coefficient in pulsating flow

Abstract A general empirical correlation has been developed for prediction of the heat transfer coefficient in a heating process for steady and pulsating flow of air through a rigid circular pipe. The pulsating frequency (5–60 Hz) was in sine form, and a combined dimensionless number composed of the Reynolds number and a dimensionless flow frequency was used to correlate thermal behavior with flow parameters. A critical value of 2.1 × 10 5 for the combined dimensionless number was noticed. Below this value no significant improvement was obtained. The correlation was found to be general and valid for steady and pulsating turbulent flow heat transfer.