Abstract
This study numerically analyzed the heat transfer characteristics outside the condenser of a rotating heat pipe grinding wheel (RHP-GW). The goal of this investigation is to determine the optimal structure and parameters for the condenser section of RHP-GW. Different fin height (f=0–7 mm), rotational Reynolds number (Rer=1602–6408) and jet Reynolds number (Rej=42 379–108 302) were analyzed under input heat flux of 4000 W/m2. A fully developed flow was imposed at the outlet of the nozzles. Results showed that the optimal heat transfer rate was obtained for fin height of 5 mm, which improved the average Nusselt number by 84% compared to the structure without fins. A critical Rej for each Rer that the impinging jet can reach the condenser section was found. The critical Rej value increases with Rer, which is in the range from 42 379 to 61 215 and 61 215 to 80 050 for Rer=6408 and Rer=9610, respectively.
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Abbreviations
- D :
-
diameter of the condenser/mm
- k :
-
turbulence kinetic energy/m2·s−2
- k f :
-
fluid thermal conductivity/W·m−1·K−1
- l c :
-
length of condenser/mm
- Nu :
-
Nusselt number
- P :
-
mean pressure/Pa
- Pr :
-
Prandtl number
- q″:
-
heat flux/W·m−2
- Re j :
-
jet Reynolds number
- Re r :
-
rotational Reynolds number
- T :
-
temperature/K
- T c :
-
mean temperature outside the condenser/K
- T n :
-
temperature of air at the nozzle exit/K
- U i :
-
mean velocity component in x direction/m·s−1
- U j :
-
mean velocity component in y direction/m·s−1
- y 0 :
-
position at the bottom of condenser
- θ :
-
angle/°
- μ :
-
dynamic viscosity/kg·m−1·s−1
- ν :
-
kinematic viscosity/m2·s−1
- ν t :
-
turbulent viscosity/m2·s−1
- ρ :
-
density/kg·m−3
- Ω :
-
rotational rate of RHP-GW/r·min−1
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Acknowledgements
This work was supported by the Natural Science Foundation of Jiangsu Province (Grant No. BK20190752), the National Natural Science Foundation of China (Grant No. 51905275), the Natural Science Foundation of Colleges and Universities in Jiangsu Province (Grant No. 19KJB460020), the Faculty Research Funding of Nanjing Forestry University (Grant No. 163040111), and the Open Foundation of Jiangsu Wind Power Generation Engineering and Technology Center (No. Zk19-03-12).
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Chen, J., Zhang, L., Fu, Y. et al. Heat Transfer Characteristics outside the Condenser of a Rotating Heat Pipe Grinding Wheel with a Lateral Air Impinging Jet. J. Therm. Sci. 30, 493–503 (2021). https://doi.org/10.1007/s11630-021-1415-6
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DOI: https://doi.org/10.1007/s11630-021-1415-6