Experimental and numerical investigations on the effects of insertion-type longitudinal vortex generators on flow and heat transfer characteristics in square minichannels

Feng, Zhenfei; Jiang, Ping; Zheng, Siyao; Zhang, Qingyuan; Chen, Zhe; Guo, Fang; Zhang, Jinxin

doi:10.1016/j.energy.2023.127855

Cited by 12 publications

(1 citation statement)

References 32 publications

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“…Fiebig [20,21] and Biswas [22] researched the implementation of a vortex generator to improve heat transfer efficiency between staggered circular tube fin heat exchangers and tube fin heat exchangers, subsequently contrasting the impact on secondary heat transfer performance. Beyond the aforementioned investigations, contemporary research indicates that methods augmenting heat transfer through longitudinal vortices exhibit dependable applicability in fin tube [23], heat transfer [24], vortex tube [25], liquid metal [26], and twisted tube [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Influence of Different Bending Shapes on the Heat Transfer Characteristics of Annular Cross Wavy Primary Surface Recuperator (CW-PSR)

Jiang,

Chen,

Huang

et al. 2023

Energies

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The cross-wave primary surface recuperator (CW-PSR) is a dependable option as a recuperator for micro gas turbines (MGT). The micro CW-PSR studied in this paper is composed of 171 stacked curved plates, with each plate containing 33 micro heat transfer channels with equivalent diameters of less than 1 mm. In this study, the influence of bending curvature on the thermal performance of CW-PSR plates is investigated through three-dimensional numerical simulation with fluid–solid–thermal coupling. The results indicate that the variation in bending curvature studied can result in a noteworthy 8% difference in the total heat transfer coefficient of CW-PSR plates. A direct correlation between heat transfer capacity and secondary flow strength is derived mathematically, explaining the mechanism by which secondary flow enhances heat transfer. By employing this relationship, a comprehensive analysis of CW-PSR plates with diverse bending curvatures is conducted, effectively showcasing how curvature influences the secondary flow pattern and enhances the channel’s heat transfer capacity. In addition, this paper considers the comprehensive influence of the size parameters of the heat transfer unit and the bending curvature of the heat transfer plate on the heat transfer and flow characteristics of the CW-PSR, and a dominant mathematical expression is obtained, which can be used for the design of similar heat exchangers of the same type.

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