Designing a sensor for local heat transfer in impingement driers

Drying homogeneity within technical web driers is an important issue in the coating industry, especially for drying sensitive functional films. In this paper we detail the construction of a simple sensor for point measurements of local heat transfer coefficients. A procedure for calibration is presented as well as a validation of the results by comparison to literature. The sensor is applied to characterize a fraction of a technical dryer indicating the position of hot spots.