A New Method of Heat Transfer Coefficient Measurements by Liquid Crystal and Digital Processing

• Published in: Chemical engineering research & design Vol. 75; no. 7; pp. 657 - 662
• Main Authors: Stasiek, J., Mikielewicz, D., Mikielewicz, J., Collins, M.W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Rugby Elsevier B.V 01-10-1997; Institution of Chemical Engineers
• Subjects: Computers in experimental physics; Exact sciences and technology; Fundamental areas of phenomenology (including applications); heat transfer; Image forming and processing; Image processing; Imaging and optical processing; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; liquid crystal; Optics; Physics; true-colour image processing; heat transfer; liquid crystal; true-colour image processing; Nusselt number; Image processing; Measuring methods; Digital image; Experimental study; Liquid crystals; Heat transfer
• ISSN: 0263-8762
• DOI: 10.1205/026387697524281

In the last ten years liquid crystals have emerged as reliable temperature sensors for heat transfer research, and have been applied in a number of situations to visualize temperature distribution under complex flow fields. In this study, the true-colour image processing of the liquid crystal has been successfully applied to the study of heat transfer problems. A new procedure has been developed (this involves a colour scale representation of the local contours of local Nusselt number) to obtain an average Nusselt number using the Hue ratio coefficient (ratio of the number of pixels for the hue range considered to the total number of pixels of a certain area).