Augmentation of Forced Convective Heat Transfer for Thermally Developing Region in Rectangular Channel by Means of Turbulence Promoter

• Published in: Nihon Kikai Gakkai rombunshuu. B hen Vol. 60; no. 574; pp. 2149 - 2157
• Main Authors: Chung, In Kee, Araki, Nobuyuki, Nakayama, Akira
• Format: Journal Article
• Language: English; Japanese
• Published: The Japan Society of Mechanical Engineers 1994
• Subjects: Performance Evaluation
• ISSN: 0387-5016; 1884-8346; 1884-8346
• DOI: 10.1299/kikaib.60.2149

A numerical and an experimental study was carried out to investigate the enhancement of heat transfer within a thermally developing region, by placing a square rod in the vicinity of the lower channel wall. A numerical analysis based on SIMPLE reveals the details of the complex unsteady flow pattern and the corresponding distribution of mass transfer rate. Exhaustive local mass transfer measurements were made using a naphthalene sublimation technique, varying the distance between the square rod and lower channel wall for the Reynolds numbers ranging from 8.27×103 to 2.205×104. Performance evaluation based on equal pumping power showed substantial augmentation of heat transfer in a thermally developing region upon placing a square rod close to the wall with an orientation angle of 60°.