Analysis of Heat Transfer Enhancement Characteristics in Laminar Flow through Circular Tubes with Variable-gap Hollow Twisted Tapes
TI Shuguang
YANG Zhi
GAO Shang
ZHENG Li
DENG Shanshan
WANG Haopeng
Abstract：A novel variable-gap hollow twisted tape structure was proposed in this paper,aiming to effectively balance the heat transfer performance and flow resistance of shell-and-tube heat exchangers in building heating,ventilation,and air conditioning(HAVC)systems.A"narrow-wide-narrow"channel design was introduced to enhance fluid flow disturbance,improve heat transfer efficiency,and suppress excessive increases in flow resistance.Numerical simulations were conducted using Fluent software.The results show that the proposed structure improves heat transfer efficiency at higher Reynolds numbers compared to traditional twisted tapes while controlling the increase in flow resistance,thus enhancing overall heat transfer performance.The influence of the number of twisted tapes on the comprehensive heat transfer enhancement was also revealed.The research findings have great significance for optimizing the structural design of heat exchangers in building HVAC systems,and provide new insights for the optimization of inserted twisted tape designs in heat exchangers.
Keywords：variable-gap hollow twisted tapeenhanced heat transferlaminar flownumerical simulation
Publication Date：2025-02-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 50-57 )