文献类型：期刊文献

英文题名：Numerical studies on heat transfer enhancement by hollow-cross disk for cracking coils

作者：Zong, Yuan[1];Bai, Dehong[1];Zhou, Minmin[1,2];Zhao, Ling[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Utah, Dept Chem Engn, Inst Clean & Secure Energy, Salt Lake City, UT 84112 USA

年份：2019

卷号：135

起止页码：82

外文期刊名：CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION

收录：;EI(收录号：20184806160952);WOS:【SCI-EXPANDED(收录号:WOS:000457511600008)】；

基金：This work is supported by the Fundamental Research Funds for the Central Universities of China (No. 222201714045). Besides, the authors acknowledge the supported by the Fundamental Research Funds for the Central Universities (No. 22221818014). YZ especially thanks Prof. Jeremy Nicholas Thornock from University of Utah for supporting the joint research collaboration.

语种：英文

外文关键词：Numerical simulation; Heat transfer enhancement; Vortex generator; Hollow-cross disk

摘要：A novel comprehensive vortex generator, hollow-cross disk (HCD) which comprises a special sinusoidal wave structure, has been proposed to modify the configuration for cracking coil. The effects of HCD on the turbulent flow patterns, heat transfer characteristics and micro-mixing efficiency of the flow are investigated by CFD modelling in the present work. The numerical results demonstrate that in the test range of flow rates, the vorticial flow induced by HCD couples with CVPs and hairpin-like vortex, efficiently enhancing the convective heat transfer locally and globally. In contrast, although the global swirling flow induced by a twisted-tape can enhance the turbulence intensity, larger pressure drop taking place in the coil leads to relatively poor comprehensive heat transfer performance and lower micro-mixing efficiency. Moreover, the mechanisms of heat transfer enhancement for the cases with inserts have been investigated by the synergy regulation and the synergy between the temperature gradient and velocity has been discussed. The results indicate that better synergy occurring in the vicinity of coil surface is a key factor to enhance heat transfer for the cracking process. The obtained results can be used as a guidance for the design and optimization of the inserts for the cracking process.