Nanofluid heat transfer between concentric independently rotating tubes with axial flow

15th Asian Congress of Fluid Mechanics

物理学;力学

Abdul Rahman, Mohd Rosdzimin^1 ; Leong, Kin Yuen^1 ; Idris, Azam Che^1 ; Saad, Mohd Rashdan^1 ; Anwar, Mahmood^2

Department of Mechanical, Faculty of Engineering, Universiti Pertahanan Nasional Malaysia, Kem Sg. Besi, Kuala Lumpur

57000, Malaysia^1

Faculty of Engineering and Science, Curtin University, Sarawak Campus, Malaysia^2

关键词: Counter rotating;    Heat transfer rate;    K-epsilon turbulent model;    Multiphase model;    Nanofluids;    Nusselt number distribution;    Rotating tubes;    Rotation number;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/822/1/012034/pdf
DOI  :  10.1088/1742-6596/822/1/012034

学科分类：力学，机械学

来源: IOP

【 摘 要 】

Nanofluid heat transfer behaviour between concentric independently rotating tubes with an axial flow was numerically investigated. Co-rotating and counter-rotating of the inner and outer tubes was simulated at a fixed rotation number. Flow inside the annulus was turbulent with Reynolds number of 5000 and 10000. k-epsilon turbulent model was used and the current work is in agreement with published experimental work. Mixture-multiphase model was used to model the multiphase flows of the TiO2/water nanofluid. Results show that the Nusselt number increases with the Reynolds number. At a constant Reynolds number, different Nusselt number distribution along the hotted tube for co-rotating and counter-rotating tube was observed. The counter-rotating tube was found to be more efficient in enhancing the heat transfer rate in comparison to the co-rotating tube.