Research on the enhanced heat transfer mechanism of self-vibrating pulse type pit heat exchange tubes
ZANG Qian
DENG Xiaogang
WANG Hangyu
ZHOU Xuan
WU Hao
Abstract：Based on the elliptical deep pit tube and combined with the theory of self-excited oscillation pulse flow enhanced heat transfer,a new type of self-excited pulse type pit heat transfer tube is proposed.The study uses numerical simulation methods to compare and analyze three-dimensional models of light tubes,concave pit tubes,and a new type of self-excited oscillating pulse concave pit heat transfer tube.By observing the velocity and temperature fields inside the new heat transfer tube,the enhanced heat transfer mechanism is analyzed.The results showed that when the parameters of the self-excited oscillation cavity are d1=15 mm,D=120 mm,L=42 mm,and the inlet flow velocity is 1.5 m/s,the comprehensive evaluation coefficient(PEC)of the new heat exchange tube increased by about 21.1%compared to the light tube and about 2.7%compared to the concave pit tube.Compared with the concave pit tube,the velocity of the central jet in the new heat exchange tube is faster and more evenly distributed,the overall temperature is higher,and the rate of temperature rise along the flow direction is also faster.This heat transfer tube generates multi-scale vortices through a unique structural design,utilizing vortex excitation phenomena to stimulate the synergistic effect of vortices and pulsating flows,achieving composite enhanced heat transfer and providing innovative ideas for optimizing the performance of heat transfer equipment.
Keywords：enhanced heat transferself-excited oscillationconcave pit tubes
Publication Date：2025-12-25
Online Publishing Date：2026-01-26(First online date of this platform, not the publication date of the document)
Pages：5( 53-57 )