Turbulent Forced Convection of Nanofluids Flow in Corrugated Tubes

2nd International Conference on Engineering Sciences

Abbas, Abdalrazzaq K.^1 ; Dhaidan, Nabeel S.^1

Department of Mechanical Engineering, College of Engineering, University of Kerbala, Kerbala, Iraq^1

关键词: Corrugated tubes;    Heat Transfer enhancement;    Hydrodynamic performance;    Nanofluids;    Nanoparticle loadings;    Rate of heat transfer;    Thermal behaviours;    Turbulent forced convection;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/433/1/012054/pdf
DOI  :  10.1088/1757-899X/433/1/012054

来源: IOP

【 摘 要 】

The heat transfer enhancement and accompanied pressure drop penalty caused by using nanofluids as the heat transfer fluids in corrugated tubes was investigated numerically. The study involved the dispersion of SO2 nanoparticles at different concentrations and sizes in the base fluid at various Reynolds numbers from 5,000 to 60,000. The simulation adopted a k-e model and FLUENT-based control volume to solve the turbulent flow field and associated thermal behaviours of the nanofluids. The volume fraction of nanoparticles varied from 1% to 4%, while the size of the nanoparticles ranged from 30 nm to 80 nm in diameter. The thermal and hydrodynamic performance of nanofluids were compared with those of the base fluid, and the calculated results were validated by, and agree well with, the findings of previous work. The simulated results reveal that the heat exchange rate is greatly influenced by the use of different nanofluids parameters. Enhancements in the rate of heat transfer and expanse of pressure drop and resultant pumping energy are associated with the dispersion of more nanoparticles and/or a decrease in the nanoparticle size. Moreover, it was found that the effect of nanoparticle loading is more significant than the effect of nanoparticle size. Further, the techniques of heat transfer (corrugation and nanoparticles) were found to be ineffective for Reynolds numbers greater than 40,000.