Numerical thermal performance study in a heat exchanger tube with inclined elliptical rings

7th International Conference on Environment and Industrial Innovation

生态环境科学;工业技术

Sodsri, W.^1 ; Tamna, S.^2 ; Thianpong, C.^1 ; Promvonge, P.^1

Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok

10520, Thailand^1

Applied Mathematics and Mechanics Research Laboratory (AMM), Department of Automotive Engineering, Faculty of Engineering, TNI Bangkok, Thailand^2

关键词: Eccentricity ratios;    Heat exchanger tube;    Heat transfer augmentation;    Pressure loss;    Smooth tubes;    Test fluids;    Thermal Performance;    Turbulent intensities;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/67/1/012035/pdf
DOI  :  10.1088/1755-1315/67/1/012035

来源: IOP

【 摘 要 】

The paper deals with a numerical study on the effect of inclined elliptical ring (IER) on heat transfer augmentation in a uniform heat-fluxed heat exchanger tube. In the present work, the 60° IER was mounted repeatedly in the tube with six different eccentricity ratios (ER= b/a = 1, 0.9, 0.8, 0.7, 0.6 and 0.5) at a single ring-pitch ratio PR= 1.0. Air as the test fluid flows into the tube for Reynolds number ranging from 4000 to 20,000. To find the optimum thermal performance, the effect of ERvalues on the heat transfer and pressure loss is investigated. The study indicates that the use of IER can induce higher turbulent intensity imparted to the flow leading to higher heat transfer in range of about 237 to 461% above the smooth tube.