Numerical simulation of heat transfer and friction in non-uniform wall roughness lattice with different roughness element shapes

Xiao, Hongguang; Chen, Wenzhen; Yan, Bing

doi:10.1016/j.anucene.2015.06.029

Cited by 4 publications

(1 citation statement)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main objective was to present how the cubic non-linear k-ε model predicted three-dimensional flow and heat transfer characteristics through stationary and rotating ribbed ducts. Xiao et al (2015) studied the heat transfer and friction characteristics in non-uniform wall roughness lattice by simulations using the unsteady Reynolds-Averaged Navier-Stokes (URANS) method with the Reynolds stress model (RSM). They found that the maximum heat transfer enhancement increases were about 2.6-6 times.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of heat transfer in a square channel by roughened surfaces in rib-elements and turbulent flow manipulation

Liu

Xie

Sundén

et al. 2017

HFF

View full text Add to dashboard Cite

Purpose The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties. Design/methodology/approach The novel geometries in the present research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. All turbulent fluid flow and heat transfer results are presented using computation fluid dynamics with a validated v2f turbulence closure model. Turbulent flow characteristics and heat transfer performances in square channels with improved ribbed structures are numerically analyzed in this research work. Findings Based on the results, it is found that rounded transition cylindrical ribs have a large advantage over the conventional ribs in both enhancing heat transfer and reducing pressure loss penalty. In addition, cylindrical ribs increase the flow impingement at the upstream of the ribs, which will effectively increase the high heat transfer areas. The design of rounded transition cylindrical ribs and grooves will be an effective way to improve heat transfer enhancement and overall thermal performance of internal channels within blade cooling. Originality/value The novel geometries in this research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. The combination of cylindrical ribs and grooves to manipulate the turbulent flow.

show abstract

Section: Introductionmentioning

confidence: 99%