摘要
The numerical and experimental study was carried out for the discrete double-inclined ribs (DDIR) tube developed on the basis of the convective heat transfer field-coordination theory. The experimentally fitted relationships of heat transfer and resistance coefficients were given. The periodical change of the original surface specially designed in the DDIR tube induced multi-longitudinal vortex flow and enhanced heat transfer remarkably with less extra flow resistance.When Re=500—2300,heat transfer enhancement of the DDIR tube would be increased by 2.5—6.5 times with a resistance increase of 120%—300% compared to the laminar heat transfer of a circular tube (L/D=300) considering inlet effect. When Re=2300—104,heat transfer enhancement would be increased by 130%—240% with a resistance increase of 130%—220%.When Re=104—5×104,heat transfer enhancement would be increased by 110%—130% with a resistance increase of 220%—240% compared to the circular tube.There was no flow dead zone in the DDIR tube so fouling could be prevented in the tube.Its manufacture could be more efficient and low-cost, therefore it is a kind of heat transfer enhancement tube with excellent overall performance.
The numerical and experimental study was carried out for the discrete double-inclined ribs (DDIR) tube developed on the basis of the convective heat transfer field-coordination theory. The experimentally fitted relationships of heat transfer and resistance coefficients were given. The periodical change of the original surface specially designed in the DDIR tube induced multi-longitudinal vortex flow and enhanced heat transfer remarkably with less extra flow resistance. When Re = 500-2300, heat transfer enhancement of the DDIR tube would be increased by 2.5-6.5 times with a resistance increase of 120%-300% compared to the laminar heat transfer of a circular tube (L/D = 300) considering inlet effect. When Re = 2300-104, heat transfer enhancement would be increased by 130%-240% with a resistance increase of 130%-220%. When Re = 104-5 × 104, heat transfer enhancement would be increased by 110%-130% with a resistance increase of 220%-240% compared to the circular tube. There was no flow dead zone in the DDIR tube so fouling could be prevented in the tube. Its manufacture could be more efficient and low-cost, therefore it is a kind of heat transfer enhancement tube with excellent overall performance.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2005年第6期995-998,共4页
CIESC Journal
基金
国家重点基础研究发展规划项目(G2000026301).~~
