Validation of the discrete element roughness method for predicting heat transfer on rough surfaces. (June 2019)

• Record Type: Journal Article
• Authors: Hanson, David R.; Kinzel, Michael P.; McClain, Stephen T.
• Is Part Of: International journal of heat and mass transfer. Volume 136(2019)
• Page Start: 1217
• Page End: 1232
• Publication Date: 2019-06
• Subjects: Large-scale roughness -- Heat transfer -- CFD; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2019.03.062
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: Discrete Element Roughness (DERM) implementation in the context of a general-purpose CFD code. Benchmarked results for a series of canonical validation cases. Results indicating potential to improve heat transfer prediction on rough surfaces compared to traditional models. Abstract: The Discrete Element Roughness Method (DERM) is evaluated as an engineering solution to the problem of convective heat transfer on rough surfaces. As part of the present work, DERM is incorporated into a general purpose compressible CFD code and explored as a way of modeling the sub-resolved roughness scales. In addition, DERM-model inputs are evaluated in detail and developed to represent sand-grain roughness (SGR). The results display good agreement in a number of validation cases. The overall results clearly indicate that DERM has potential to improve heat transfer predictions beyond the capability of SGR models, while only slightly increasing the computation time.